{"id":117313,"date":"2026-10-24T16:32:45","date_gmt":"2026-10-24T08:32:45","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/117313.html"},"modified":"2026-10-24T16:32:45","modified_gmt":"2026-10-24T08:32:45","slug":"hdfs-%e5%bf%ab%e7%85%a7%e6%9c%ba%e5%88%b6%e7%9a%84%e5%8e%9f%e7%90%86%e4%b8%8e%e6%95%b0%e6%8d%ae%e5%a4%87%e4%bb%bd%e3%80%81%e6%81%a2%e5%a4%8d%e5%ae%9e%e6%93%8d","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/117313.html","title":{"rendered":"HDFS - \u5feb\u7167\u673a\u5236\u7684\u539f\u7406\u4e0e\u6570\u636e\u5907\u4efd\u3001\u6062\u590d\u5b9e\u64cd"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261024083237-6adc6d2587d89.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>&#x1f44b; \u5927\u5bb6\u597d&#xff0c;\u6b22\u8fce\u6765\u5230\u6211\u7684\u6280\u672f\u535a\u5ba2&#xff01; &#x1f4da; \u5728\u8fd9\u91cc&#xff0c;\u6211\u4f1a\u5206\u4eab\u5b66\u4e60\u7b14\u8bb0\u3001\u5b9e\u6218\u7ecf\u9a8c\u4e0e\u6280\u672f\u601d\u8003&#xff0c;\u529b\u6c42\u7528\u7b80\u5355\u7684\u65b9\u5f0f\u8bb2\u6e05\u695a\u590d\u6742\u7684\u95ee\u9898\u3002 &#x1f3af; \u672c\u6587\u5c06\u56f4\u7ed5HDFS\u8fd9\u4e2a\u8bdd\u9898\u5c55\u5f00&#xff0c;\u5e0c\u671b\u80fd\u4e3a\u4f60\u5e26\u6765\u4e00\u4e9b\u542f\u53d1\u6216\u5b9e\u7528\u7684\u53c2\u8003\u3002 &#x1f331; \u65e0\u8bba\u4f60\u662f\u521a\u5165\u95e8\u7684\u65b0\u624b&#xff0c;\u8fd8\u662f\u6b63\u5728\u8fdb\u9636\u7684\u5f00\u53d1\u8005&#xff0c;\u5e0c\u671b\u4f60\u90fd\u80fd\u6709\u6240\u6536\u83b7&#xff01;<\/p>\n<hr \/>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>HDFS &#8211; \u5feb\u7167\u673a\u5236\u7684\u539f\u7406\u4e0e\u6570\u636e\u5907\u4efd\u3001\u6062\u590d\u5b9e\u64cd &#x1f310;&#x1f4c2;<\/li>\n<li>\n<ul>\n<li>\u4ec0\u4e48\u662f HDFS \u5feb\u7167&#xff1f;&#x1f914;<\/li>\n<li>\u5feb\u7167\u673a\u5236\u7684\u8bbe\u8ba1\u539f\u7406 &#x1f527;<\/li>\n<li>\n<ul>\n<li>\u5feb\u7167\u7684\u5143\u6570\u636e\u7ba1\u7406 &#x1f4da;<\/li>\n<li>\n<ul>\n<li>\u5199\u65f6\u590d\u5236&#xff08;Copy-on-Write&#xff09;\u8be6\u89e3 &#x1f4be;<\/li>\n<\/ul>\n<\/li>\n<li>\u5feb\u7167\u7684\u5b58\u50a8\u5f00\u9500\u5206\u6790 &#x1f4ca;<\/li>\n<\/ul>\n<\/li>\n<li>\u542f\u7528\u4e0e\u7ba1\u7406\u5feb\u7167\u7684\u57fa\u672c\u547d\u4ee4\u884c\u64cd\u4f5c &#x1f6e0;\ufe0f<\/li>\n<li>\n<ul>\n<li>1. \u5141\u8bb8\u76ee\u5f55\u521b\u5efa\u5feb\u7167 \u2705<\/li>\n<li>2. \u521b\u5efa\u5feb\u7167 &#x1f4f8;<\/li>\n<li>3. \u67e5\u770b\u5feb\u7167\u5185\u5bb9 &#x1f440;<\/li>\n<li>4. \u6bd4\u8f83\u4e24\u4e2a\u5feb\u7167\u6216\u5feb\u7167\u4e0e\u5f53\u524d\u72b6\u6001 &#x1f50d;<\/li>\n<li>5. \u5220\u9664\u5feb\u7167 \u274c<\/li>\n<li>6. \u7981\u7528\u5feb\u7167\u529f\u80fd &#x1f6ab;<\/li>\n<\/ul>\n<\/li>\n<li>\u4f7f\u7528 Mermaid \u56fe\u8868\u5c55\u793a\u5feb\u7167\u751f\u547d\u5468\u671f &#x1f3af;<\/li>\n<li>Java API \u5b9e\u73b0\u5feb\u7167\u7ba1\u7406 &#x1f4bb;<\/li>\n<li>\n<ul>\n<li>\u73af\u5883\u51c6\u5907 &#x1f4e6;<\/li>\n<li>\u793a\u4f8b 1&#xff1a;Java \u521b\u5efa\u5feb\u7167 &#x1f4f8;<\/li>\n<li>\u793a\u4f8b 2&#xff1a;\u6bd4\u8f83\u5feb\u7167\u5dee\u5f02 &#x1f50e;<\/li>\n<li>\u793a\u4f8b 3&#xff1a;\u4ece\u5feb\u7167\u6062\u590d\u6587\u4ef6 &#x1f501;<\/li>\n<\/ul>\n<\/li>\n<li>\u5b9e\u9645\u5e94\u7528\u573a\u666f&#xff1a;\u6570\u636e\u5907\u4efd\u4e0e\u707e\u96be\u6062\u590d &#x1f6a8;<\/li>\n<li>\n<ul>\n<li>\u573a\u666f\u4e00&#xff1a;\u6bcf\u65e5\u81ea\u52a8\u5907\u4efd &#x1f5d3;\ufe0f<\/li>\n<li>\u573a\u666f\u4e8c&#xff1a;\u9632\u6b62\u8bef\u5220\u9664\u653b\u51fb &#x1f6e1;\ufe0f<\/li>\n<li>\u573a\u666f\u4e09&#xff1a;\u7070\u5ea6\u53d1\u5e03\u4e0e\u7248\u672c\u56de\u6eda &#x1f504;<\/li>\n<\/ul>\n<\/li>\n<li>\u6027\u80fd\u5f71\u54cd\u4e0e\u6700\u4f73\u5b9e\u8df5 &#x1f3c6;<\/li>\n<li>\n<ul>\n<li>\u6027\u80fd\u8003\u91cf \u26a0\ufe0f<\/li>\n<li>\u6700\u4f73\u5b9e\u8df5\u5efa\u8bae \u2705<\/li>\n<\/ul>\n<\/li>\n<li>\u4f7f\u7528 Mermaid \u5c55\u793a\u5feb\u7167\u5907\u4efd\u67b6\u6784 &#x1f3d7;\ufe0f<\/li>\n<li>\u5e38\u89c1\u95ee\u9898\u4e0e\u6392\u67e5\u6280\u5de7 \u2753&#x1f527;<\/li>\n<li>\n<ul>\n<li>\u95ee\u9898 1&#xff1a;&#096;Cannot create snapshot, directory is not a snapshot root&#096;<\/li>\n<li>\u95ee\u9898 2&#xff1a;&#096;Snapshot root has too many snapshots&#096;<\/li>\n<li>\u95ee\u9898 3&#xff1a;\u5220\u9664\u6587\u4ef6\u5f88\u6162<\/li>\n<li>\u95ee\u9898 4&#xff1a;\u5feb\u7167\u5360\u7528\u7a7a\u95f4\u8fc7\u5927<\/li>\n<\/ul>\n<\/li>\n<li>\u4e0e\u5176\u4ed6\u5907\u4efd\u65b9\u6848\u7684\u5bf9\u6bd4 &#x1f19a;<\/li>\n<li>\u672a\u6765\u53d1\u5c55\u65b9\u5411\u4e0e\u589e\u5f3a\u5efa\u8bae &#x1f680;<\/li>\n<li>\n<ul>\n<li>1. \u4e0e\u5bf9\u8c61\u5b58\u50a8\u96c6\u6210 \u2601\ufe0f<\/li>\n<li>2. \u65f6\u95f4\u65c5\u884c\u67e5\u8be2&#xff08;Time Travel Query&#xff09;\u23f3<\/li>\n<li>3. \u81ea\u52a8\u5316\u667a\u80fd\u5feb\u7167 &#x1f916;<\/li>\n<\/ul>\n<\/li>\n<li>\u7ed3\u8bed &#x1f308;<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2>HDFS &#8211; \u5feb\u7167\u673a\u5236\u7684\u539f\u7406\u4e0e\u6570\u636e\u5907\u4efd\u3001\u6062\u590d\u5b9e\u64cd &#x1f310;&#x1f4c2;<\/h2>\n<p>\u5728\u5927\u6570\u636e\u751f\u6001\u7cfb\u7edf\u4e2d&#xff0c;Hadoop \u5206\u5e03\u5f0f\u6587\u4ef6\u7cfb\u7edf&#xff08;Hadoop Distributed File System, \u7b80\u79f0 HDFS&#xff09;\u626e\u6f14\u7740\u81f3\u5173\u91cd\u8981\u7684\u89d2\u8272\u3002\u4f5c\u4e3a\u652f\u6491\u6d77\u91cf\u6570\u636e\u5b58\u50a8\u548c\u5904\u7406\u7684\u6838\u5fc3\u7ec4\u4ef6&#xff0c;HDFS \u63d0\u4f9b\u4e86\u9ad8\u541e\u5410\u91cf\u7684\u6570\u636e\u8bbf\u95ee\u80fd\u529b&#xff0c;\u9002\u7528\u4e8e\u5927\u89c4\u6a21\u6570\u636e\u96c6\u7684\u5e94\u7528\u573a\u666f\u3002\u7136\u800c&#xff0c;\u968f\u7740\u4f01\u4e1a\u5bf9\u6570\u636e\u4e00\u81f4\u6027\u548c\u5bb9\u707e\u80fd\u529b\u7684\u8981\u6c42\u65e5\u76ca\u63d0\u5347&#xff0c;\u5982\u4f55\u4fdd\u969c HDFS \u4e2d\u6570\u636e\u7684\u5b89\u5168\u6027\u3001\u53ef\u6062\u590d\u6027\u4ee5\u53ca\u7248\u672c\u63a7\u5236&#xff0c;\u6210\u4e3a\u8fd0\u7ef4\u548c\u5f00\u53d1\u4eba\u5458\u5fc5\u987b\u9762\u5bf9\u7684\u95ee\u9898\u3002<\/p>\n<p>\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e00\u6311\u6218&#xff0c;HDFS \u5f15\u5165\u4e86 \u5feb\u7167\u673a\u5236&#xff08;Snapshot Mechanism&#xff09;\u3002\u8be5\u673a\u5236\u5141\u8bb8\u7528\u6237\u5728\u4e0d\u4e2d\u65ad\u670d\u52a1\u7684\u524d\u63d0\u4e0b&#xff0c;\u5bf9\u6307\u5b9a\u76ee\u5f55\u521b\u5efa\u201c\u65f6\u95f4\u70b9\u201d\u7684\u53ea\u8bfb\u526f\u672c&#xff0c;\u4ece\u800c\u5b9e\u73b0\u9ad8\u6548\u7684\u6570\u636e\u5907\u4efd\u4e0e\u5feb\u901f\u6062\u590d\u3002\u672c\u6587\u5c06\u6df1\u5165\u5256\u6790 HDFS \u5feb\u7167\u673a\u5236\u7684\u5de5\u4f5c\u539f\u7406&#xff0c;\u7ed3\u5408\u5b9e\u9645\u64cd\u4f5c\u6848\u4f8b&#xff0c;\u8be6\u7ec6\u8bb2\u89e3\u5176\u5728\u6570\u636e\u4fdd\u62a4\u4e2d\u7684\u5e94\u7528&#xff0c;\u5e76\u901a\u8fc7 Java \u7f16\u7a0b\u63a5\u53e3\u8fdb\u884c\u81ea\u52a8\u5316\u7ba1\u7406\u6f14\u793a&#xff0c;\u5e2e\u52a9\u8bfb\u8005\u5168\u9762\u638c\u63e1\u8fd9\u4e00\u5173\u952e\u6280\u672f &#x1f4a1;\u3002<\/p>\n<hr \/>\n<h3>\u4ec0\u4e48\u662f HDFS \u5feb\u7167&#xff1f;&#x1f914;<\/h3>\n<p>HDFS \u5feb\u7167\u662f HDFS \u6587\u4ef6\u7cfb\u7edf\u63d0\u4f9b\u7684\u4e00\u79cd\u8f7b\u91cf\u7ea7\u3001\u7a7a\u95f4\u9ad8\u6548\u7684\u53ea\u8bfb\u955c\u50cf\u529f\u80fd\u3002\u5b83\u8bb0\u5f55\u67d0\u4e00\u65f6\u523b\u67d0\u4e2a\u76ee\u5f55\u53ca\u5176\u5b50\u76ee\u5f55\u4e0b\u6240\u6709\u6587\u4ef6\u7684\u72b6\u6001&#xff0c;\u5305\u62ec\u6587\u4ef6\u5185\u5bb9\u3001\u6743\u9650\u3001ACL&#xff08;\u8bbf\u95ee\u63a7\u5236\u5217\u8868&#xff09;\u3001\u4fee\u6539\u65f6\u95f4\u7b49\u5143\u4fe1\u606f\u3002\u4e00\u65e6\u521b\u5efa&#xff0c;\u5feb\u7167\u4e0d\u53ef\u88ab\u4fee\u6539\u6216\u5220\u9664&#xff08;\u9664\u975e\u663e\u5f0f\u64cd\u4f5c&#xff09;&#xff0c;\u4f46\u539f\u59cb\u6570\u636e\u4ecd\u53ef\u6b63\u5e38\u8bfb\u5199&#xff0c;\u4e92\u4e0d\u5f71\u54cd \u2699\ufe0f\u3002<\/p>\n<p>\u5feb\u7167\u673a\u5236\u7684\u6700\u5927\u4f18\u52bf\u5728\u4e8e\u5b83\u7684\u201c\u5199\u65f6\u590d\u5236&#xff08;Copy-on-Write, CoW&#xff09;\u201d\u7b56\u7565\u3002\u8fd9\u610f\u5473\u7740\u5feb\u7167\u672c\u8eab\u5e76\u4e0d\u7acb\u5373\u590d\u5236\u6587\u4ef6\u5757&#xff0c;\u800c\u662f\u5171\u4eab\u539f\u59cb\u6570\u636e\u5757\u3002\u53ea\u6709\u5f53\u539f\u59cb\u6587\u4ef6\u53d1\u751f\u4fee\u6539\u65f6&#xff0c;\u7cfb\u7edf\u624d\u4f1a\u4fdd\u7559\u65e7\u7248\u672c\u7684\u6570\u636e\u5757\u7528\u4e8e\u5feb\u7167\u5f15\u7528&#xff0c;\u800c\u65b0\u5199\u5165\u7684\u6570\u636e\u5219\u5206\u914d\u65b0\u7684\u5757\u3002\u8fd9\u79cd\u8bbe\u8ba1\u6781\u5927\u8282\u7701\u4e86\u5b58\u50a8\u7a7a\u95f4&#xff0c;\u540c\u65f6\u4fdd\u8bc1\u4e86\u5feb\u7167\u7684\u4e00\u81f4\u6027\u4e0e\u5b8c\u6574\u6027\u3002<\/p>\n<p>\u2705 \u5173\u952e\u7279\u6027\u603b\u7ed3&#xff1a;<\/p>\n<ul>\n<li>\u8f7b\u91cf\u7ea7&#xff1a;\u521d\u59cb\u521b\u5efa\u51e0\u4e4e\u65e0\u5f00\u9500<\/li>\n<li>\u4e00\u81f4\u6027\u5f3a&#xff1a;\u57fa\u4e8e\u7279\u5b9a\u65f6\u95f4\u70b9\u7684\u539f\u5b50\u89c6\u56fe<\/li>\n<li>\u652f\u6301\u5d4c\u5957\u76ee\u5f55&#xff1a;\u53ef\u5bf9\u4efb\u610f\u6df1\u5ea6\u76ee\u5f55\u521b\u5efa\u5feb\u7167<\/li>\n<li>\u4e0d\u5f71\u54cd\u6027\u80fd&#xff1a;\u8bfb\u5199\u64cd\u4f5c\u4e0d\u53d7\u5feb\u7167\u5b58\u5728\u5f71\u54cd<\/li>\n<li>\u53ef\u5d4c\u5957\u4f7f\u7528&#xff1a;\u4e00\u4e2a\u76ee\u5f55\u53ef\u62e5\u6709\u591a\u4e2a\u5feb\u7167<\/li>\n<li>\u652f\u6301\u5dee\u5f02\u6bd4\u8f83&#xff1a;\u53ef\u7528\u4e8e\u5ba1\u8ba1\u6216\u589e\u91cf\u5907\u4efd<\/li>\n<\/ul>\n<hr \/>\n<h3>\u5feb\u7167\u673a\u5236\u7684\u8bbe\u8ba1\u539f\u7406 &#x1f527;<\/h3>\n<p>\u8981\u7406\u89e3 HDFS \u5feb\u7167\u7684\u5de5\u4f5c\u65b9\u5f0f&#xff0c;\u6211\u4eec\u9700\u8981\u4ece\u5e95\u5c42\u67b6\u6784\u5165\u624b\u3002HDFS \u7684\u6838\u5fc3\u7531 NameNode \u548c DataNode \u6784\u6210&#xff1a;<\/p>\n<ul>\n<li>NameNode&#xff1a;\u8d1f\u8d23\u7ba1\u7406\u6587\u4ef6\u7cfb\u7edf\u7684\u547d\u540d\u7a7a\u95f4&#xff08;Namespace&#xff09;&#xff0c;\u7ef4\u62a4\u6587\u4ef6\u5230\u6570\u636e\u5757\u7684\u6620\u5c04\u5173\u7cfb\u3002<\/li>\n<li>DataNode&#xff1a;\u8d1f\u8d23\u5b58\u50a8\u5b9e\u9645\u7684\u6570\u636e\u5757\u5e76\u6267\u884c\u8bfb\u5199\u8bf7\u6c42\u3002<\/li>\n<\/ul>\n<p>\u5f53\u6211\u4eec\u5728 HDFS \u4e0a\u542f\u7528\u5feb\u7167\u529f\u80fd\u65f6&#xff0c;NameNode \u4f1a\u4e3a\u652f\u6301\u5feb\u7167\u7684\u76ee\u5f55\u7ef4\u62a4\u989d\u5916\u7684\u5143\u6570\u636e\u7ed3\u6784&#xff0c;\u7528\u4ee5\u8ddf\u8e2a\u4e0d\u540c\u5feb\u7167\u4e4b\u95f4\u7684\u72b6\u6001\u53d8\u5316\u3002<\/p>\n<h4>\u5feb\u7167\u7684\u5143\u6570\u636e\u7ba1\u7406 &#x1f4da;<\/h4>\n<p>\u6bcf\u4e2a\u542f\u7528\u4e86\u5feb\u7167\u529f\u80fd\u7684\u76ee\u5f55\u88ab\u79f0\u4e3a\u201c\u5feb\u7167\u6839\u76ee\u5f55\u201d&#xff08;Snapshot Root&#xff09;\u3002NameNode \u5728\u5185\u5b58\u4e2d\u4e3a\u8be5\u76ee\u5f55\u7ef4\u62a4\u4e00\u4e2a\u5feb\u7167\u5217\u8868&#xff0c;\u8bb0\u5f55\u6240\u6709\u5df2\u521b\u5efa\u7684\u5feb\u7167\u53ca\u5176\u5bf9\u5e94\u7684 inode&#xff08;\u7d22\u5f15\u8282\u70b9&#xff09;\u72b6\u6001\u3002\u6bcf\u5f53\u6587\u4ef6\u88ab\u4fee\u6539\u3001\u91cd\u547d\u540d\u6216\u5220\u9664\u65f6&#xff0c;NameNode \u4f1a\u5224\u65ad\u8be5\u8def\u5f84\u662f\u5426\u5c5e\u4e8e\u67d0\u4e2a\u5feb\u7167\u8303\u56f4\u5185\u3002\u5982\u679c\u662f&#xff0c;\u5219\u89e6\u53d1\u5199\u65f6\u590d\u5236\u903b\u8f91\u3002<\/p>\n<h5>\u5199\u65f6\u590d\u5236&#xff08;Copy-on-Write&#xff09;\u8be6\u89e3 &#x1f4be;<\/h5>\n<p>\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u76ee\u5f55 \/data\/project_v1&#xff0c;\u5e76\u4e3a\u5176\u521b\u5efa\u4e86\u4e00\u4e2a\u540d\u4e3a s1 \u7684\u5feb\u7167&#xff1a;<\/p>\n<p>hdfs dfsadmin <span class=\"token parameter variable\">-allowSnapshot<\/span> \/data\/project_v1<br \/>\nhdfs snapshot <span class=\"token parameter variable\">-create<\/span> \/data\/project_v1 s1<\/p>\n<p>\u6b64\u65f6&#xff0c;\/data\/project_v1 \u4e0b\u7684\u6240\u6709\u6587\u4ef6\u90fd\u5904\u4e8e\u5feb\u7167\u4fdd\u62a4\u4e4b\u4e0b\u3002\u63a5\u4e0b\u6765&#xff0c;\u5982\u679c\u6211\u4eec\u6267\u884c\u4ee5\u4e0b\u64cd\u4f5c&#xff1a;<\/p>\n<p><span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;updated content&#034;<\/span> <span class=\"token operator\">|<\/span> hdfs dfs <span class=\"token parameter variable\">-appendToFile<\/span> &#8211; \/data\/project_v1\/config.txt<\/p>\n<p>HDFS \u5c06\u68c0\u6d4b\u5230 config.txt \u88ab\u4fee\u6539\u3002\u7531\u4e8e\u8be5\u6587\u4ef6\u5b58\u5728\u4e8e\u5feb\u7167 s1 \u4e2d&#xff0c;\u7cfb\u7edf\u4e0d\u4f1a\u76f4\u63a5\u8986\u76d6\u539f\u6570\u636e\u5757&#xff0c;\u800c\u662f&#xff1a;<\/p>\n<li>\u6807\u8bb0\u539f\u6709\u6570\u636e\u5757\u4e3a\u201c\u53ea\u8bfb\u201d&#xff0c;\u4f9b\u5feb\u7167 s1 \u5f15\u7528&#xff1b;<\/li>\n<li>\u521b\u5efa\u65b0\u7684\u6570\u636e\u5757\u5b58\u50a8\u66f4\u65b0\u540e\u7684\u5185\u5bb9&#xff1b;<\/li>\n<li>\u66f4\u65b0\u5f53\u524d\u76ee\u5f55\u6811\u4e2d\u7684\u6587\u4ef6\u6307\u9488\u6307\u5411\u65b0\u5757\u3002<\/li>\n<p>\u8fd9\u6837\u4e00\u6765&#xff0c;\u5feb\u7167 s1 \u4f9d\u7136\u80fd\u770b\u5230\u4fee\u6539\u524d\u7684 config.txt&#xff0c;\u800c\u4e3b\u76ee\u5f55\u5219\u53cd\u6620\u6700\u65b0\u72b6\u6001\u3002\u6574\u4e2a\u8fc7\u7a0b\u5bf9\u5ba2\u6237\u7aef\u900f\u660e&#xff0c;\u4e14\u6027\u80fd\u635f\u8017\u6781\u5c0f\u3002<\/p>\n<h4>\u5feb\u7167\u7684\u5b58\u50a8\u5f00\u9500\u5206\u6790 &#x1f4ca;<\/h4>\n<p>\u7531\u4e8e\u5feb\u7167\u91c7\u7528 CoW \u7b56\u7565&#xff0c;\u5176\u7a7a\u95f4\u5360\u7528\u53d6\u51b3\u4e8e\u540e\u7eed\u53d1\u751f\u7684\u53d8\u66f4\u91cf\u3002\u521d\u59cb\u521b\u5efa\u5feb\u7167\u65f6\u4e0d\u6d88\u8017\u989d\u5916\u7a7a\u95f4&#xff1b;\u968f\u7740\u539f\u59cb\u6570\u636e\u4e0d\u65ad\u88ab\u4fee\u6539&#xff0c;\u5feb\u7167\u6240\u9700\u4fdd\u7559\u7684\u5386\u53f2\u5757\u9010\u6e10\u589e\u591a&#xff0c;\u7a7a\u95f4\u5360\u7528\u4e5f\u968f\u4e4b\u589e\u957f\u3002<\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u7528\u5982\u4e0b\u516c\u5f0f\u4f30\u7b97\u5feb\u7167\u603b\u7a7a\u95f4\u4f7f\u7528&#xff1a;<\/p>\n<p>\u5feb\u7167\u7a7a\u95f4 &#061; \u03a3(\u88ab\u4fee\u6539\u6587\u4ef6\u7684\u5386\u53f2\u6570\u636e\u5757\u5927\u5c0f)<\/p>\n<p>\u56e0\u6b64&#xff0c;\u5728\u9891\u7e41\u5199\u5165\u7684\u76ee\u5f55\u4e0a\u521b\u5efa\u5feb\u7167\u53ef\u80fd\u5bfc\u81f4\u8f83\u9ad8\u7684\u5b58\u50a8\u6210\u672c\u3002\u5efa\u8bae\u4ec5\u5bf9\u76f8\u5bf9\u7a33\u5b9a\u6216\u5173\u952e\u4e1a\u52a1\u76ee\u5f55\u542f\u7528\u5feb\u7167\u529f\u80fd&#xff0c;\u4f8b\u5982\u914d\u7f6e\u6587\u4ef6\u76ee\u5f55\u3001ETL \u8f93\u51fa\u533a\u3001\u6a21\u578b\u8bad\u7ec3\u7ed3\u679c\u7b49\u3002<\/p>\n<hr \/>\n<h3>\u542f\u7528\u4e0e\u7ba1\u7406\u5feb\u7167\u7684\u57fa\u672c\u547d\u4ee4\u884c\u64cd\u4f5c &#x1f6e0;\ufe0f<\/h3>\n<p>HDFS \u63d0\u4f9b\u4e86\u4e00\u5957\u5b8c\u6574\u7684\u547d\u4ee4\u884c\u5de5\u5177\u6765\u7ba1\u7406\u5feb\u7167\u529f\u80fd\u3002\u8fd9\u4e9b\u547d\u4ee4\u901a\u8fc7 hdfs \u5ba2\u6237\u7aef\u8c03\u7528&#xff0c;\u65e0\u9700\u91cd\u542f\u96c6\u7fa4\u5373\u53ef\u751f\u6548\u3002<\/p>\n<h4>1. \u5141\u8bb8\u76ee\u5f55\u521b\u5efa\u5feb\u7167 \u2705<\/h4>\n<p>\u5728\u521b\u5efa\u5feb\u7167\u4e4b\u524d&#xff0c;\u5fc5\u987b\u5148\u5141\u8bb8\u76ee\u6807\u76ee\u5f55\u652f\u6301\u5feb\u7167\u529f\u80fd&#xff1a;<\/p>\n<p>hdfs dfsadmin <span class=\"token parameter variable\">-allowSnapshot<\/span> \/path\/to\/directory<\/p>\n<p>\u4f8b\u5982&#xff1a;<\/p>\n<p>hdfs dfsadmin <span class=\"token parameter variable\">-allowSnapshot<\/span> \/user\/hive\/warehouse\/sales_db<\/p>\n<p>\u6210\u529f\u540e&#xff0c;NameNode \u4f1a\u6807\u8bb0\u8be5\u76ee\u5f55\u4e3a\u201c\u53ef\u5feb\u7167\u5316\u201d\u3002\u6ce8\u610f&#xff1a;\u6bcf\u4e2a\u76ee\u5f55\u6700\u591a\u53ea\u80fd\u6709\u4e00\u4e2a\u7236\u7ea7\u5feb\u7167\u6839\u76ee\u5f55\u3002<\/p>\n<h4>2. \u521b\u5efa\u5feb\u7167 &#x1f4f8;<\/h4>\n<p>\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u521b\u5efa\u5feb\u7167&#xff1a;<\/p>\n<p>hdfs snapshot <span class=\"token parameter variable\">-create<\/span> <span class=\"token operator\">&lt;<\/span>path<span class=\"token operator\">&gt;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token operator\">&lt;<\/span>snapshot-name<span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">]<\/span><\/p>\n<p>\u5982\u679c\u4e0d\u6307\u5b9a\u540d\u79f0&#xff0c;\u7cfb\u7edf\u5c06\u81ea\u52a8\u751f\u6210\u7c7b\u4f3c .snapshot\/snapshot_YYYYMMdd-HHmmss \u7684\u65f6\u95f4\u6233\u547d\u540d\u3002<\/p>\n<p>\u793a\u4f8b&#xff1a;<\/p>\n<p><span class=\"token comment\"># \u521b\u5efa\u540d\u4e3a backup_20250405 \u7684\u5feb\u7167<\/span><br \/>\nhdfs snapshot <span class=\"token parameter variable\">-create<\/span> \/user\/hive\/warehouse\/sales_db backup_20250405<\/p>\n<p><span class=\"token comment\"># \u67e5\u8be2\u5feb\u7167\u662f\u5426\u521b\u5efa\u6210\u529f<\/span><br \/>\nhdfs snapshot <span class=\"token parameter variable\">-list<\/span> \/user\/hive\/warehouse\/sales_db<\/p>\n<p>\u8f93\u51fa\u793a\u4f8b&#xff1a;<\/p>\n<p>Listing snapshot root: \/user\/hive\/warehouse\/sales_db<br \/>\ndrwxr-x&#8212; user group 2025-04-05 10:30 .snapshot\/backup_20250405<\/p>\n<h4>3. \u67e5\u770b\u5feb\u7167\u5185\u5bb9 &#x1f440;<\/h4>\n<p>\u53ef\u4ee5\u901a\u8fc7\u6807\u51c6 HDFS \u547d\u4ee4\u8bbf\u95ee\u5feb\u7167\u5185\u90e8\u6587\u4ef6&#xff1a;<\/p>\n<p><span class=\"token comment\"># \u5217\u51fa\u5feb\u7167\u4e2d\u7684\u6587\u4ef6<\/span><br \/>\nhdfs dfs <span class=\"token parameter variable\">-ls<\/span> \/.snapshot\/backup_20250405<\/p>\n<p><span class=\"token comment\"># \u67e5\u770b\u67d0\u6587\u4ef6\u5185\u5bb9<\/span><br \/>\nhdfs dfs <span class=\"token parameter variable\">-cat<\/span> \/.snapshot\/backup_20250405\/data\/part-00000<\/p>\n<p>\u5feb\u7167\u8def\u5f84\u9075\u5faa\u7edf\u4e00\u683c\u5f0f&#xff1a;\/&lt;snapshot-root&gt;\/.snapshot\/&lt;snapshot-name&gt;\/&#8230;<\/p>\n<h4>4. \u6bd4\u8f83\u4e24\u4e2a\u5feb\u7167\u6216\u5feb\u7167\u4e0e\u5f53\u524d\u72b6\u6001 &#x1f50d;<\/h4>\n<p>HDFS \u652f\u6301\u4f7f\u7528 snapshotdiff \u547d\u4ee4\u67e5\u770b\u4e24\u4e2a\u5feb\u7167\u4e4b\u95f4\u6216\u5feb\u7167\u4e0e\u5f53\u524d\u76ee\u5f55\u7684\u5dee\u5f02&#xff1a;<\/p>\n<p>hdfs snapshot <span class=\"token parameter variable\">-diff<\/span> \/user\/hive\/warehouse\/sales_db backup_20250405 current<\/p>\n<p>\u8f93\u51fa\u53ef\u80fd\u5982\u4e0b&#xff1a;<\/p>\n<p>M       data\/part-00001<br \/>\n&#043;       data\/new_file.txt<br \/>\n&#8211;       old_report.csv<\/p>\n<p>\u5176\u4e2d&#xff1a;<\/p>\n<ul>\n<li>M \u8868\u793a\u4fee\u6539&#xff08;Modified&#xff09;<\/li>\n<li>&#043; \u8868\u793a\u65b0\u589e&#xff08;Added&#xff09;<\/li>\n<li>&#8211; \u8868\u793a\u5220\u9664&#xff08;Deleted&#xff09;<\/li>\n<\/ul>\n<p>\u8fd9\u9879\u529f\u80fd\u975e\u5e38\u9002\u5408\u7528\u4e8e\u5ba1\u8ba1\u53d8\u66f4\u3001\u8bc6\u522b\u5f02\u5e38\u64cd\u4f5c\u6216\u6784\u5efa\u589e\u91cf\u5907\u4efd\u7b56\u7565\u3002<\/p>\n<h4>5. \u5220\u9664\u5feb\u7167 \u274c<\/h4>\n<p>\u5f53\u4e0d\u518d\u9700\u8981\u67d0\u4e2a\u5feb\u7167\u65f6&#xff0c;\u53ef\u4ee5\u5c06\u5176\u5220\u9664\u4ee5\u91ca\u653e\u5143\u6570\u636e\u8d44\u6e90&#xff1a;<\/p>\n<p>hdfs snapshot <span class=\"token parameter variable\">-delete<\/span> \/user\/hive\/warehouse\/sales_db backup_20250405<\/p>\n<p>\u26a0\ufe0f \u6ce8\u610f&#xff1a;\u5220\u9664\u5feb\u7167\u4e0d\u4f1a\u5f71\u54cd\u539f\u59cb\u6570\u636e&#xff0c;\u4f46\u4f1a\u79fb\u9664\u5bf9\u8be5\u65f6\u95f4\u70b9\u7684\u8bbf\u95ee\u80fd\u529b\u3002\u5982\u679c\u67d0\u4e9b\u5386\u53f2\u6570\u636e\u5757\u4ec5\u88ab\u8be5\u5feb\u7167\u5f15\u7528&#xff0c;\u5219\u5220\u9664\u540e\u8fd9\u4e9b\u5757\u5c06\u88ab\u5783\u573e\u56de\u6536\u3002<\/p>\n<h4>6. \u7981\u7528\u5feb\u7167\u529f\u80fd &#x1f6ab;<\/h4>\n<p>\u82e5\u9700\u5f7b\u5e95\u5173\u95ed\u67d0\u76ee\u5f55\u7684\u5feb\u7167\u80fd\u529b&#xff0c;\u53ef\u6267\u884c&#xff1a;<\/p>\n<p>hdfs dfsadmin <span class=\"token parameter variable\">-disallowSnapshot<\/span> \/user\/hive\/warehouse\/sales_db<\/p>\n<p>\u6267\u884c\u524d\u5fc5\u987b\u786e\u4fdd\u8be5\u76ee\u5f55\u4e0b\u65e0\u4efb\u4f55\u6d3b\u52a8\u5feb\u7167&#xff0c;\u5426\u5219\u4f1a\u62a5\u9519\u3002<\/p>\n<hr \/>\n<h3>\u4f7f\u7528 Mermaid \u56fe\u8868\u5c55\u793a\u5feb\u7167\u751f\u547d\u5468\u671f &#x1f3af;<\/h3>\n<p>\u4e0b\u9762\u4f7f\u7528 Mermaid \u6d41\u7a0b\u56fe\u76f4\u89c2\u5730\u5c55\u793a HDFS \u5feb\u7167\u4ece\u542f\u7528\u5230\u4f7f\u7528\u7684\u5b8c\u6574\u6d41\u7a0b&#xff1a;<\/p>\n<p>  #mermaid-svg-dvfD3oNnKxeZYYmm{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-dvfD3oNnKxeZYYmm .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-dvfD3oNnKxeZYYmm 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0.8);padding:2px;}#mermaid-svg-dvfD3oNnKxeZYYmm .icon-shape .label rect,#mermaid-svg-dvfD3oNnKxeZYYmm .image-shape .label rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-dvfD3oNnKxeZYYmm .label-icon{display:inline-block;height:1em;overflow:visible;vertical-align:-0.125em;}#mermaid-svg-dvfD3oNnKxeZYYmm .node .label-icon path{fill:currentColor;stroke:revert;stroke-width:revert;}#mermaid-svg-dvfD3oNnKxeZYYmm :root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;}<\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/p>\n<p>\u662f<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/p>\n<p>\u5426<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/p>\n<p>\u5426<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/p>\n<p>\u662f<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/p>\n<p>\u662f<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/p>\n<p>\u5426<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/p>\n<p>\u662f<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/p>\n<p>\u5426<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>\u5f00\u59cb<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>\u76ee\u5f55\u662f\u5426\u5b58\u5728?<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>\u542f\u7528\u5feb\u7167\u529f\u80fddfsadmin -allowSnapshot<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>\u521b\u5efa\u76ee\u5f55<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>\u521b\u5efa\u5feb\u7167snapshot -create<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>\u7528\u6237\u6b63\u5e38\u8bfb\u5199\u6570\u636e<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>\u6570\u636e\u662f\u5426\u88ab\u4fee\u6539?<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>\u5feb\u7167\u4fdd\u6301\u5171\u4eab\u6570\u636e\u5757<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>\u89e6\u53d1\u5199\u65f6\u590d\u5236\u4fdd\u7559\u65e7\u5757\u4f9b\u5feb\u7167\u4f7f\u7528<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>\u65b0\u6570\u636e\u5199\u5165\u65b0\u5757<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>\u5feb\u7167\u4ecd\u53ef\u8bbf\u95ee\u5386\u53f2\u7248\u672c<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>\u662f\u5426\u9700\u8981\u6062\u590d?<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>\u4ece\u5feb\u7167\u62f7\u8d1d\u6587\u4ef6\u56de\u539f\u8def\u5f84<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>\u662f\u5426\u5220\u9664\u5feb\u7167?<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>\u6267\u884c snapshot -delete<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>\u7ee7\u7eed\u76d1\u63a7<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>\u91ca\u653e\u5386\u53f2\u6570\u636e\u5757<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>\u7ed3\u675f<\/p>\n<p><\/span><\/p>\n<p>\u6b64\u56fe\u6e05\u6670\u5c55\u793a\u4e86\u5feb\u7167\u673a\u5236\u7684\u6838\u5fc3\u601d\u60f3\u2014\u2014\u5ef6\u8fdf\u590d\u5236 &#043; \u6309\u9700\u4fdd\u7559\u3002\u5b83\u4e0d\u4ec5\u8bf4\u660e\u4e86\u5feb\u7167\u5982\u4f55\u5728\u4e0d\u5f71\u54cd\u6027\u80fd\u7684\u60c5\u51b5\u4e0b\u5b9e\u73b0\u6570\u636e\u4fdd\u62a4&#xff0c;\u4e5f\u63ed\u793a\u4e86\u5176\u80cc\u540e\u7684\u7a7a\u95f4\u4f18\u5316\u7b56\u7565\u3002<\/p>\n<hr \/>\n<h3>Java API \u5b9e\u73b0\u5feb\u7167\u7ba1\u7406 &#x1f4bb;<\/h3>\n<p>\u9664\u4e86\u547d\u4ee4\u884c\u5de5\u5177&#xff0c;HDFS \u8fd8\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684 Java API&#xff0c;\u5141\u8bb8\u5f00\u53d1\u8005\u5728\u5e94\u7528\u7a0b\u5e8f\u4e2d\u96c6\u6210\u5feb\u7167\u529f\u80fd\u3002\u8fd9\u5bf9\u4e8e\u5b9e\u73b0\u81ea\u52a8\u5316\u7684\u5907\u4efd\u8c03\u5ea6\u3001\u6545\u969c\u6062\u590d\u3001\u7248\u672c\u63a7\u5236\u7cfb\u7edf\u7b49\u573a\u666f\u975e\u5e38\u6709\u4ef7\u503c\u3002<\/p>\n<h4>\u73af\u5883\u51c6\u5907 &#x1f4e6;<\/h4>\n<p>\u9996\u5148\u786e\u4fdd\u9879\u76ee\u4e2d\u5f15\u5165 Hadoop \u5ba2\u6237\u7aef\u4f9d\u8d56\u3002\u5982\u679c\u4f60\u4f7f\u7528 Maven&#xff0c;\u6dfb\u52a0\u4ee5\u4e0b\u4f9d\u8d56&#xff1a;<\/p>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>dependency<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>groupId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>org.apache.hadoop<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>groupId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>artifactId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>hadoop-client<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>artifactId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>version<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>3.3.6<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>version<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>dependency<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>\u7136\u540e\u914d\u7f6e Hadoop \u914d\u7f6e\u6587\u4ef6\u8def\u5f84\u6216\u5728\u4ee3\u7801\u4e2d\u624b\u52a8\u8bbe\u7f6e Configuration \u5bf9\u8c61\u3002<\/p>\n<h4>\u793a\u4f8b 1&#xff1a;Java \u521b\u5efa\u5feb\u7167 &#x1f4f8;<\/h4>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u5b8c\u6574\u7684 Java \u7a0b\u5e8f&#xff0c;\u7528\u4e8e\u8fde\u63a5 HDFS \u5e76\u521b\u5efa\u5feb\u7167&#xff1a;<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">org<span class=\"token punctuation\">.<\/span>apache<span class=\"token punctuation\">.<\/span>hadoop<span class=\"token punctuation\">.<\/span>conf<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Configuration<\/span><\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">org<span class=\"token punctuation\">.<\/span>apache<span class=\"token punctuation\">.<\/span>hadoop<span class=\"token punctuation\">.<\/span>fs<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">FileSystem<\/span><\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">org<span class=\"token punctuation\">.<\/span>apache<span class=\"token punctuation\">.<\/span>hadoop<span class=\"token punctuation\">.<\/span>fs<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Path<\/span><\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">org<span class=\"token punctuation\">.<\/span>apache<span class=\"token punctuation\">.<\/span>hadoop<span class=\"token punctuation\">.<\/span>hdfs<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">DistributedFileSystem<\/span><\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">org<span class=\"token punctuation\">.<\/span>apache<span class=\"token punctuation\">.<\/span>hadoop<span class=\"token punctuation\">.<\/span>hdfs<span class=\"token punctuation\">.<\/span>protocol<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">SnapshotException<\/span><\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">IOException<\/span><\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>net<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">URI<\/span><\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">HDFSSnapshotManager<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">FileSystem<\/span> fs<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">HDFSSnapshotManager<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> namenodeUri<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">Configuration<\/span> conf <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Configuration<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u53ef\u9009&#xff1a;\u52a0\u8f7d core-site.xml \u548c hdfs-site.xml<\/span><br \/>\n        <span class=\"token comment\">\/\/ conf.addResource(new Path(&#034;\/etc\/hadoop\/conf\/core-site.xml&#034;));<\/span><br \/>\n        <span class=\"token comment\">\/\/ conf.addResource(new Path(&#034;\/etc\/hadoop\/conf\/hdfs-site.xml&#034;));<\/span><\/p>\n<p>        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>fs <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">FileSystem<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">URI<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">create<\/span><span class=\"token punctuation\">(<\/span>namenodeUri<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> conf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/**<br \/>\n     * \u5141\u8bb8\u76ee\u5f55\u521b\u5efa\u5feb\u7167<br \/>\n     *\/<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">allowSnapshot<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> dirPath<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token punctuation\">(<\/span>fs <span class=\"token keyword\">instanceof<\/span> <span class=\"token class-name\">DistributedFileSystem<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">IllegalStateException<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;File system is not HDFS&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token class-name\">DistributedFileSystem<\/span> dfs <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">DistributedFileSystem<\/span><span class=\"token punctuation\">)<\/span> fs<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Path<\/span> path <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Path<\/span><span class=\"token punctuation\">(<\/span>dirPath<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            dfs<span class=\"token punctuation\">.<\/span><span class=\"token function\">allowSnapshot<\/span><span class=\"token punctuation\">(<\/span>path<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u2705 \u6210\u529f\u5141\u8bb8\u5feb\u7167&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> dirPath<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">SnapshotException<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>err<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u274c \u65e0\u6cd5\u5141\u8bb8\u5feb\u7167&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> e<span class=\"token punctuation\">.<\/span><span class=\"token function\">getMessage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/**<br \/>\n     * \u521b\u5efa\u5feb\u7167<br \/>\n     *\/<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">createSnapshot<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> dirPath<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> snapshotName<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token punctuation\">(<\/span>fs <span class=\"token keyword\">instanceof<\/span> <span class=\"token class-name\">DistributedFileSystem<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">IllegalStateException<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;File system must be DistributedFileSystem&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token class-name\">DistributedFileSystem<\/span> dfs <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">DistributedFileSystem<\/span><span class=\"token punctuation\">)<\/span> fs<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Path<\/span> path <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Path<\/span><span class=\"token punctuation\">(<\/span>dirPath<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">String<\/span> snapshotPath <span class=\"token operator\">&#061;<\/span> dfs<span class=\"token punctuation\">.<\/span><span class=\"token function\">createSnapshot<\/span><span class=\"token punctuation\">(<\/span>path<span class=\"token punctuation\">,<\/span> snapshotName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#x1f4f8; \u5feb\u7167\u521b\u5efa\u6210\u529f&#xff01;\u8def\u5f84&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> snapshotPath<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">IOException<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>err<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u274c \u521b\u5efa\u5feb\u7167\u5931\u8d25&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> e<span class=\"token punctuation\">.<\/span><span class=\"token function\">getMessage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/**<br \/>\n     * \u5217\u51fa\u6307\u5b9a\u76ee\u5f55\u7684\u6240\u6709\u5feb\u7167<br \/>\n     *\/<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">listSnapshots<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> dirPath<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token punctuation\">(<\/span>fs <span class=\"token keyword\">instanceof<\/span> <span class=\"token class-name\">DistributedFileSystem<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">DistributedFileSystem<\/span> dfs <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">DistributedFileSystem<\/span><span class=\"token punctuation\">)<\/span> fs<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Path<\/span> path <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Path<\/span><span class=\"token punctuation\">(<\/span>dirPath<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Path<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> snapshots <span class=\"token operator\">&#061;<\/span> dfs<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSnapshotPaths<\/span><span class=\"token punctuation\">(<\/span>path<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>snapshots<span class=\"token punctuation\">.<\/span><span class=\"token function\">isEmpty<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#x1f4ed; \u8be5\u76ee\u5f55\u4e0b\u65e0\u5feb\u7167&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#x1f4c1; \u5f53\u524d\u5feb\u7167\u5217\u8868&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Path<\/span> p <span class=\"token operator\">:<\/span> snapshots<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u2192 &#034;<\/span> <span class=\"token operator\">&#043;<\/span> p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">IOException<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>err<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u274c \u83b7\u53d6\u5feb\u7167\u5217\u8868\u5931\u8d25&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> e<span class=\"token punctuation\">.<\/span><span class=\"token function\">getMessage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">HDFSSnapshotManager<\/span> manager <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HDFSSnapshotManager<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;hdfs:\/\/localhost:9000&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token class-name\">String<\/span> targetDir <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\/user\/hive\/warehouse\/sales_db&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">String<\/span> snapName <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;backup_&#034;<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentTimeMillis<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u6b65\u9aa41&#xff1a;\u5141\u8bb8\u5feb\u7167&#xff08;\u9996\u6b21\u6267\u884c&#xff09;<\/span><br \/>\n            manager<span class=\"token punctuation\">.<\/span><span class=\"token function\">allowSnapshot<\/span><span class=\"token punctuation\">(<\/span>targetDir<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u6b65\u9aa42&#xff1a;\u521b\u5efa\u5feb\u7167<\/span><br \/>\n            manager<span class=\"token punctuation\">.<\/span><span class=\"token function\">createSnapshot<\/span><span class=\"token punctuation\">(<\/span>targetDir<span class=\"token punctuation\">,<\/span> snapName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u6b65\u9aa43&#xff1a;\u5217\u51fa\u6240\u6709\u5feb\u7167<\/span><br \/>\n            manager<span class=\"token punctuation\">.<\/span><span class=\"token function\">listSnapshots<\/span><span class=\"token punctuation\">(<\/span>targetDir<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">IOException<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            e<span class=\"token punctuation\">.<\/span><span class=\"token function\">printStackTrace<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>&#x1f4cc; \u8bf4\u660e&#xff1a;<\/p>\n<ul>\n<li>\u4f7f\u7528 DistributedFileSystem \u7c7b\u63d0\u4f9b\u7684 allowSnapshot() \u548c createSnapshot() \u65b9\u6cd5&#xff1b;<\/li>\n<li>\u5feb\u7167\u540d\u79f0\u53ef\u81ea\u5b9a\u4e49&#xff0c;\u5efa\u8bae\u5305\u542b\u65f6\u95f4\u6233\u6216\u7248\u672c\u53f7\u4ee5\u4fbf\u8bc6\u522b&#xff1b;<\/li>\n<li>\u6240\u6709\u64cd\u4f5c\u5747\u9700\u6355\u83b7 IOException \u6216\u5177\u4f53\u5b50\u7c7b\u5f02\u5e38\u3002<\/li>\n<\/ul>\n<hr \/>\n<h4>\u793a\u4f8b 2&#xff1a;\u6bd4\u8f83\u5feb\u7167\u5dee\u5f02 &#x1f50e;<\/h4>\n<p>HDFS Java API \u4e5f\u652f\u6301\u83b7\u53d6\u4e24\u4e2a\u5feb\u7167\u4e4b\u95f4\u7684\u5dee\u5f02\u3002\u867d\u7136\u6ca1\u6709\u76f4\u63a5\u7684 high-level \u65b9\u6cd5&#xff0c;\u4f46\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u8c03\u7528\u5e95\u5c42 RPC \u63a5\u53e3\u5b9e\u73b0&#xff1a;<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">org<span class=\"token punctuation\">.<\/span>apache<span class=\"token punctuation\">.<\/span>hadoop<span class=\"token punctuation\">.<\/span>hdfs<span class=\"token punctuation\">.<\/span>protocol<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">SnapshotDiffReport<\/span><\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">org<span class=\"token punctuation\">.<\/span>apache<span class=\"token punctuation\">.<\/span>hadoop<span class=\"token punctuation\">.<\/span>hdfs<span class=\"token punctuation\">.<\/span>protocol<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">SnapshotDiffReport<\/span><span class=\"token punctuation\">.<\/span><span class=\"token class-name\">Entry<\/span><\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6dfb\u52a0\u5230 HDFSSnapshotManager \u7c7b\u4e2d<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">compareSnapshots<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> dirPath<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> fromSnap<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> toSnap<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token punctuation\">(<\/span>fs <span class=\"token keyword\">instanceof<\/span> <span class=\"token class-name\">DistributedFileSystem<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">DistributedFileSystem<\/span> dfs <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">DistributedFileSystem<\/span><span class=\"token punctuation\">)<\/span> fs<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">Path<\/span> path <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Path<\/span><span class=\"token punctuation\">(<\/span>dirPath<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">SnapshotDiffReport<\/span> report <span class=\"token operator\">&#061;<\/span> dfs<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSnapshotDiffReport<\/span><span class=\"token punctuation\">(<\/span>path<span class=\"token punctuation\">,<\/span> fromSnap<span class=\"token punctuation\">,<\/span> toSnap<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#x1f50d; \u5dee\u5f02\u62a5\u544a&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> fromSnap <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034; \u2192 &#034;<\/span> <span class=\"token operator\">&#043;<\/span> toSnap<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Entry<\/span> entry <span class=\"token operator\">:<\/span> report<span class=\"token punctuation\">.<\/span><span class=\"token function\">getDiffList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span>entry<span class=\"token punctuation\">.<\/span><span class=\"token function\">getType<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">case<\/span> <span class=\"token constant\">CREATED<\/span><span class=\"token operator\">:<\/span><br \/>\n                    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#043; \u521b\u5efa: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> entry<span class=\"token punctuation\">.<\/span><span class=\"token function\">getPath<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">case<\/span> <span class=\"token constant\">DELETED<\/span><span class=\"token operator\">:<\/span><br \/>\n                    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;- \u5220\u9664: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> entry<span class=\"token punctuation\">.<\/span><span class=\"token function\">getPath<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">case<\/span> <span class=\"token constant\">MODIFIED<\/span><span class=\"token operator\">:<\/span><br \/>\n                    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;M \u4fee\u6539: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> entry<span class=\"token punctuation\">.<\/span><span class=\"token function\">getPath<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">default<\/span><span class=\"token operator\">:<\/span><br \/>\n                    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;? \u672a\u77e5: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> entry<span class=\"token punctuation\">.<\/span><span class=\"token function\">getPath<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">IOException<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>err<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u274c \u83b7\u53d6\u5dee\u5f02\u62a5\u544a\u5931\u8d25&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> e<span class=\"token punctuation\">.<\/span><span class=\"token function\">getMessage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8c03\u7528\u65b9\u5f0f&#xff1a;<\/p>\n<p>manager<span class=\"token punctuation\">.<\/span><span class=\"token function\">compareSnapshots<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/user\/hive\/warehouse\/sales_db&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;backup_20250405&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;backup_20250406&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8be5\u529f\u80fd\u53ef\u7528\u4e8e\u76d1\u63a7\u6570\u636e\u53d8\u66f4\u8d8b\u52bf&#xff0c;\u6216\u4f5c\u4e3a CI\/CD \u6d41\u6c34\u7ebf\u4e2d\u6570\u636e\u8d28\u91cf\u6821\u9a8c\u7684\u4e00\u73af\u3002<\/p>\n<hr \/>\n<h4>\u793a\u4f8b 3&#xff1a;\u4ece\u5feb\u7167\u6062\u590d\u6587\u4ef6 &#x1f501;<\/h4>\n<p>\u6709\u65f6\u5019\u6211\u4eec\u5e0c\u671b\u5c06\u67d0\u4e2a\u8bef\u5220\u6216\u635f\u574f\u7684\u6587\u4ef6\u4ece\u5feb\u7167\u4e2d\u6062\u590d\u3002\u4ee5\u4e0b\u662f Java \u5b9e\u73b0\u7684\u6062\u590d\u903b\u8f91&#xff1a;<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">org<span class=\"token punctuation\">.<\/span>apache<span class=\"token punctuation\">.<\/span>hadoop<span class=\"token punctuation\">.<\/span>fs<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">FileStatus<\/span><\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">org<span class=\"token punctuation\">.<\/span>apache<span class=\"token punctuation\">.<\/span>hadoop<span class=\"token punctuation\">.<\/span>fs<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">RemoteIterator<\/span><\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6dfb\u52a0\u65b9\u6cd5<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">restoreFromSnapshot<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> snapshotRoot<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> snapshotName<span class=\"token punctuation\">,<\/span><br \/>\n                                <span class=\"token class-name\">String<\/span> fileName<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> destination<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">Path<\/span> snapshotDir <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Path<\/span><span class=\"token punctuation\">(<\/span>snapshotRoot <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\/.snapshot\/&#034;<\/span> <span class=\"token operator\">&#043;<\/span> snapshotName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">Path<\/span> srcFile <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Path<\/span><span class=\"token punctuation\">(<\/span>snapshotDir<span class=\"token punctuation\">,<\/span> fileName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">Path<\/span> destFile <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Path<\/span><span class=\"token punctuation\">(<\/span>destination<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>fs<span class=\"token punctuation\">.<\/span><span class=\"token function\">exists<\/span><span class=\"token punctuation\">(<\/span>srcFile<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        fs<span class=\"token punctuation\">.<\/span><span class=\"token function\">copyFromLocalFile<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">false<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">,<\/span> srcFile<span class=\"token punctuation\">,<\/span> destFile<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u2705 \u6587\u4ef6\u5df2\u4ece\u5feb\u7167\u6062\u590d&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> srcFile <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034; \u2192 &#034;<\/span> <span class=\"token operator\">&#043;<\/span> destFile<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>err<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u274c \u6e90\u6587\u4ef6\u4e0d\u5b58\u5728\u4e8e\u5feb\u7167\u4e2d&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> srcFile<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4f7f\u7528\u793a\u4f8b&#xff1a;<\/p>\n<p>manager<span class=\"token punctuation\">.<\/span><span class=\"token function\">restoreFromSnapshot<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token string\">&#034;\/user\/hive\/warehouse\/sales_db&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token string\">&#034;backup_20250405&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token string\">&#034;critical_config.json&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token string\">&#034;\/user\/hive\/warehouse\/sales_db\/critical_config.json&#034;<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>&#x1f4a1; \u63d0\u793a&#xff1a;\u751f\u4ea7\u73af\u5883\u4e2d\u5efa\u8bae\u7ed3\u5408\u5b9a\u65f6\u4efb\u52a1\u6846\u67b6&#xff08;\u5982 Quartz&#xff09;\u5b9a\u671f\u521b\u5efa\u5feb\u7167&#xff0c;\u5e76\u8bb0\u5f55\u65e5\u5fd7\u4fbf\u4e8e\u8ffd\u6eaf\u3002<\/p>\n<hr \/>\n<h3>\u5b9e\u9645\u5e94\u7528\u573a\u666f&#xff1a;\u6570\u636e\u5907\u4efd\u4e0e\u707e\u96be\u6062\u590d &#x1f6a8;<\/h3>\n<p>\u5728\u771f\u5b9e\u7684\u751f\u4ea7\u73af\u5883\u4e2d&#xff0c;\u6570\u636e\u5b89\u5168\u662f\u5934\u7b49\u5927\u4e8b\u3002HDFS \u5feb\u7167\u673a\u5236\u4e3a\u6b64\u63d0\u4f9b\u4e86\u4e00\u79cd\u7b80\u5355\u800c\u5f3a\u5927\u7684\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<h4>\u573a\u666f\u4e00&#xff1a;\u6bcf\u65e5\u81ea\u52a8\u5907\u4efd &#x1f5d3;\ufe0f<\/h4>\n<p>\u8bb8\u591a\u4f01\u4e1a\u8981\u6c42\u6bcf\u5929\u51cc\u6668\u5bf9\u5173\u952e\u6570\u636e\u76ee\u5f55\u8fdb\u884c\u4e00\u6b21\u5b8c\u6574\u5907\u4efd\u3002\u4f20\u7edf\u505a\u6cd5\u662f\u4f7f\u7528 distcp \u5c06\u6570\u636e\u590d\u5236\u5230\u53e6\u4e00\u4e2a\u96c6\u7fa4\u6216\u5f52\u6863\u533a&#xff0c;\u4f46\u8fd9\u79cd\u65b9\u5f0f\u8017\u65f6\u957f\u3001\u5360\u7a7a\u95f4\u3002<\/p>\n<p>\u5229\u7528\u5feb\u7167\u673a\u5236&#xff0c;\u6211\u4eec\u53ef\u4ee5\u5b9e\u73b0\u79d2\u7ea7\u5907\u4efd&#xff1a;<\/p>\n<p><span class=\"token shebang important\">#!\/bin\/bash<\/span><br \/>\n<span class=\"token assign-left variable\">DATE<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token variable\"><span class=\"token variable\">$(<\/span><span class=\"token function\">date<\/span> &#043;%Y%m%d<span class=\"token variable\">)<\/span><\/span><br \/>\n<span class=\"token assign-left variable\">DIR<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;\/data\/analytics\/output&#034;<\/span><\/p>\n<p><span class=\"token comment\"># \u521b\u5efa\u5feb\u7167<\/span><br \/>\nhdfs snapshot <span class=\"token parameter variable\">-create<\/span> <span class=\"token variable\">$DIR<\/span> <span class=\"token string\">&#034;daily_<span class=\"token variable\">$DATE<\/span>&#034;<\/span><\/p>\n<p><span class=\"token comment\"># \u8f93\u51fa\u65e5\u5fd7<\/span><br \/>\n<span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;Backup created: daily_<span class=\"token variable\">$DATE<\/span> at <span class=\"token variable\"><span class=\"token variable\">$(<\/span><span class=\"token function\">date<\/span><span class=\"token variable\">)<\/span><\/span>&#034;<\/span><\/p>\n<p>\u914d\u5408 Linux Cron \u5b9a\u65f6\u6267\u884c&#xff1a;<\/p>\n<p><span class=\"token number\">0<\/span> <span class=\"token number\">2<\/span> * * * \/opt\/scripts\/create_daily_snapshot.sh<\/p>\n<p>\u8fd9\u6837\u6bcf\u5929\u51cc\u6668\u4e24\u70b9\u90fd\u4f1a\u751f\u6210\u4e00\u4e2a\u5feb\u7167&#xff0c;\u4fdd\u7559\u6700\u8fd17\u5929\u5373\u53ef\u6ee1\u8db3\u591a\u6570\u5408\u89c4\u9700\u6c42\u3002<\/p>\n<h4>\u573a\u666f\u4e8c&#xff1a;\u9632\u6b62\u8bef\u5220\u9664\u653b\u51fb &#x1f6e1;\ufe0f<\/h4>\n<p>\u66fe\u6709\u6848\u4f8b\u663e\u793a&#xff0c;\u8fd0\u7ef4\u4eba\u5458\u8bef\u6267\u884c hdfs dfs -rm -r \/prod\/data \u5bfc\u81f4\u6838\u5fc3\u6570\u636e\u4e22\u5931\u3002\u5c3d\u7ba1 Trash \u56de\u6536\u7ad9\u80fd\u63d0\u4f9b\u4e00\u5b9a\u4fdd\u62a4&#xff0c;\u4f46\u5728\u7981\u7528 Trash \u6216\u5f3a\u5236\u6e05\u7406\u65f6\u4ecd\u5b58\u5728\u98ce\u9669\u3002<\/p>\n<p>\u542f\u7528\u5feb\u7167\u540e&#xff0c;\u5373\u4f7f\u6570\u636e\u88ab\u5220\u9664&#xff0c;\u53ea\u8981\u5feb\u7167\u5b58\u5728&#xff0c;\u5c31\u53ef\u4ee5\u8f7b\u677e\u6062\u590d&#xff1a;<\/p>\n<p><span class=\"token comment\"># \u5047\u8bbe\u539f\u76ee\u5f55\u88ab\u5220\u9664<\/span><br \/>\nhdfs dfs <span class=\"token parameter variable\">-rm<\/span> <span class=\"token parameter variable\">-r<\/span> \/prod\/data<\/p>\n<p><span class=\"token comment\"># \u4ece\u5feb\u7167\u6062\u590d<\/span><br \/>\nhdfs dfs <span class=\"token parameter variable\">-cp<\/span> <span class=\"token parameter variable\">-p<\/span> <span class=\"token parameter variable\">-f<\/span> \/.snapshot\/snap_jan01 \/prod\/data \/prod\/data<\/p>\n<p>&#x1f4d8; \u66f4\u591a\u5173\u4e8e HDFS Trash \u673a\u5236\u7684\u4fe1\u606f&#xff0c;\u53ef\u4ee5\u53c2\u8003 Apache Hadoop \u5b98\u65b9\u6587\u6863 &#8211; HDFS Design<\/p>\n<hr \/>\n<h4>\u573a\u666f\u4e09&#xff1a;\u7070\u5ea6\u53d1\u5e03\u4e0e\u7248\u672c\u56de\u6eda &#x1f504;<\/h4>\n<p>\u5728\u673a\u5668\u5b66\u4e60\u5e73\u53f0\u4e2d&#xff0c;\u6a21\u578b\u8bad\u7ec3\u7ed3\u679c\u5e38\u4fdd\u5b58\u5728 HDFS \u4e0a\u3002\u6bcf\u6b21\u8bad\u7ec3\u5b8c\u6210\u540e&#xff0c;\u53ef\u521b\u5efa\u4e00\u4e2a\u5feb\u7167\u4f5c\u4e3a\u7248\u672c\u6807\u8bb0&#xff1a;<\/p>\n<p>hdfs snapshot <span class=\"token parameter variable\">-create<\/span> \/models\/vision\/resnet50 <span class=\"token string\">&#034;v2.1.0-train20250405&#034;<\/span><\/p>\n<p>\u82e5\u65b0\u7248\u672c\u6548\u679c\u4e0d\u4f73&#xff0c;\u53ef\u5feb\u901f\u56de\u6eda\u81f3\u65e7\u7248&#xff1a;<\/p>\n<p>hdfs dfs <span class=\"token parameter variable\">-get<\/span> \/.snapshot\/v2.1.0-train20250401\/model.pb \/current\/model.pb<\/p>\n<p>\u8fd9\u6bd4\u91cd\u65b0\u8bad\u7ec3\u8282\u7701\u5927\u91cf\u65f6\u95f4\u548c\u8ba1\u7b97\u8d44\u6e90\u3002<\/p>\n<hr \/>\n<h3>\u6027\u80fd\u5f71\u54cd\u4e0e\u6700\u4f73\u5b9e\u8df5 &#x1f3c6;<\/h3>\n<p>\u5c3d\u7ba1\u5feb\u7167\u673a\u5236\u8bbe\u8ba1\u7cbe\u5de7&#xff0c;\u4f46\u5728\u5927\u89c4\u6a21\u90e8\u7f72\u65f6\u4ecd\u9700\u5173\u6ce8\u5176\u6f5c\u5728\u5f71\u54cd\u3002<\/p>\n<h4>\u6027\u80fd\u8003\u91cf \u26a0\ufe0f<\/h4>\n<table>\n<tr>\u64cd\u4f5c\u662f\u5426\u53d7\u5f71\u54cd\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td>\u8bfb\u53d6\u6587\u4ef6<\/td>\n<td>\u274c \u5426<\/td>\n<td>\u5feb\u7167\u5b8c\u5168\u900f\u660e<\/td>\n<\/tr>\n<tr>\n<td>\u5199\u5165\u65b0\u6587\u4ef6<\/td>\n<td>\u274c \u5426<\/td>\n<td>\u4e0d\u6d89\u53ca\u5386\u53f2\u6570\u636e<\/td>\n<\/tr>\n<tr>\n<td>\u4fee\u6539\u5df2\u6709\u6587\u4ef6<\/td>\n<td>\u2705 \u662f<\/td>\n<td>\u89e6\u53d1 CoW&#xff0c;\u7565\u6709\u5ef6\u8fdf<\/td>\n<\/tr>\n<tr>\n<td>\u5220\u9664\u6587\u4ef6<\/td>\n<td>\u2705 \u662f<\/td>\n<td>\u9700\u68c0\u67e5\u662f\u5426\u88ab\u5feb\u7167\u5f15\u7528<\/td>\n<\/tr>\n<tr>\n<td>\u521b\u5efa\u5feb\u7167<\/td>\n<td>\u274c \u5426<\/td>\n<td>\u4ec5\u8bb0\u5f55\u5143\u6570\u636e<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u6839\u636e\u793e\u533a\u6d4b\u8bd5&#xff0c;\u5355\u6b21\u4fee\u6539\u64cd\u4f5c\u56e0\u5feb\u7167\u5f15\u5165\u7684\u5ef6\u8fdf\u901a\u5e38\u5728\u6beb\u79d2\u7ea7\u522b&#xff0c;\u5bf9\u5927\u591a\u6570\u5e94\u7528\u53ef\u5ffd\u7565\u4e0d\u8ba1\u3002\u4f46\u5728\u9ad8\u9891\u66f4\u65b0\u7684\u5c0f\u6587\u4ef6\u573a\u666f\u4e0b&#xff08;\u5982\u65e5\u5fd7\u8ffd\u52a0&#xff09;&#xff0c;\u5efa\u8bae\u8c28\u614e\u542f\u7528\u3002<\/p>\n<h4>\u6700\u4f73\u5b9e\u8df5\u5efa\u8bae \u2705<\/h4>\n<li>\n<p>\u9009\u62e9\u5408\u9002\u7684\u76ee\u5f55 \u4f18\u5148\u5bf9\u9759\u6001\u6216\u4f4e\u9891\u53d8\u66f4\u7684\u5173\u952e\u76ee\u5f55\u542f\u7528\u5feb\u7167&#xff0c;\u5982\u6570\u4ed3\u8868\u5206\u533a\u3001\u6a21\u578b\u8f93\u51fa\u3001\u62a5\u8868\u7ed3\u679c\u7b49\u3002<\/p>\n<\/li>\n<li>\n<p>\u547d\u540d\u89c4\u8303\u6e05\u6670 \u4f7f\u7528\u6709\u610f\u4e49\u7684\u5feb\u7167\u540d&#xff0c;\u5982 backup_20250405, release_v1.2, pre_upgrade&#xff0c;\u907f\u514d\u4f7f\u7528\u9ed8\u8ba4\u65f6\u95f4\u6233\u3002<\/p>\n<\/li>\n<li>\n<p>\u5b9a\u671f\u6e05\u7406\u8fc7\u671f\u5feb\u7167 \u8bbe\u7f6e TTL \u6216\u901a\u8fc7\u811a\u672c\u5b9a\u671f\u5220\u9664\u8d85\u8fc7\u4fdd\u7559\u671f\u9650\u7684\u5feb\u7167&#xff0c;\u9632\u6b62\u5143\u6570\u636e\u81a8\u80c0\u3002<\/p>\n<\/li>\n<li>\n<p>\u7ed3\u5408\u76d1\u63a7\u544a\u8b66 \u76d1\u63a7\u5feb\u7167\u6570\u91cf\u3001\u5dee\u5f02\u53d8\u5316\u7387\u3001\u5b58\u50a8\u589e\u957f\u8d8b\u52bf&#xff0c;\u53ca\u65f6\u53d1\u73b0\u5f02\u5e38\u884c\u4e3a\u3002<\/p>\n<\/li>\n<li>\n<p>\u4e0d\u8981\u66ff\u4ee3\u5f02\u5730\u5bb9\u707e \u5feb\u7167\u4ecd\u4f4d\u4e8e\u540c\u4e00\u96c6\u7fa4\u5185&#xff0c;\u65e0\u6cd5\u62b5\u5fa1\u673a\u623f\u7ea7\u6545\u969c\u3002\u5e94\u914d\u5408\u8de8\u96c6\u7fa4\u590d\u5236&#xff08;\u5982 DistCp &#043; Snapshots&#xff09;\u5b9e\u73b0\u771f\u6b63\u7684\u9ad8\u53ef\u7528\u3002<\/p>\n<\/li>\n<p>&#x1f310; \u60f3\u4e86\u89e3\u66f4\u591a\u5173\u4e8e HDFS \u5907\u4efd\u7b56\u7565\u7684\u8bbe\u8ba1\u601d\u8def&#xff1f;\u63a8\u8350\u9605\u8bfb Cloudera \u5b98\u65b9\u535a\u5ba2\u6587\u7ae0&#xff1a;Best Practices for HDFS Backup and Recovery<\/p>\n<hr \/>\n<h3>\u4f7f\u7528 Mermaid \u5c55\u793a\u5feb\u7167\u5907\u4efd\u67b6\u6784 &#x1f3d7;\ufe0f<\/h3>\n<p>\u4e0b\u9762\u662f\u4e00\u4e2a\u5178\u578b\u7684\u57fa\u4e8e HDFS 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:root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;}<\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>Production Cluster<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/p>\n<p>Trigger<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/p>\n<p>Read\/Write<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/p>\n<p>Check Snapshot<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/p>\n<p>Restore from Snapshot<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/p>\n<p>Alert on Anomaly<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>HDFS Data Nodes<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>Distributed Storage<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>NameNode<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>Metadata including Snapshots<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>Snapshot: daily_20250405<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>Snapshot: daily_20250406<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>Snapshot: pre_upgrade<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>Backup Scheduler<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>Create Snapshot Daily<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>User Application<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>Disaster Event<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>Data Corruption<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>Recovery Tool<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>Rollback to daily_20250405<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>Monitoring System<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>Admin Console<\/p>\n<p><\/span><\/p>\n<p>\u8be5\u56fe\u5c55\u793a\u4e86\u5feb\u7167\u5728\u6574\u4e2a\u6570\u636e\u751f\u547d\u5468\u671f\u4e2d\u7684\u89d2\u8272&#xff1a;\u4ece\u65e5\u5e38\u5907\u4efd\u3001\u5e94\u7528\u8bbf\u95ee&#xff0c;\u5230\u707e\u96be\u6062\u590d\u548c\u76d1\u63a7\u54cd\u5e94\u3002\u7eff\u8272\u8868\u793a\u6b63\u5e38\u5feb\u7167&#xff0c;\u84dd\u8272\u8868\u793a\u7279\u6b8a\u7528\u9014\u5feb\u7167&#xff08;\u5982\u5347\u7ea7\u524d&#xff09;&#xff0c;\u7ea2\u8272\u8868\u793a\u6545\u969c\u4e8b\u4ef6\u3002\u6574\u4e2a\u4f53\u7cfb\u5f3a\u8c03\u81ea\u52a8\u5316\u3001\u53ef\u89c2\u6d4b\u6027\u548c\u5feb\u901f\u54cd\u5e94\u80fd\u529b\u3002<\/p>\n<hr \/>\n<h3>\u5e38\u89c1\u95ee\u9898\u4e0e\u6392\u67e5\u6280\u5de7 \u2753&#x1f527;<\/h3>\n<p>\u5728\u4f7f\u7528 HDFS \u5feb\u7167\u8fc7\u7a0b\u4e2d&#xff0c;\u53ef\u80fd\u4f1a\u9047\u5230\u4e00\u4e9b\u5178\u578b\u95ee\u9898\u3002\u4ee5\u4e0b\u662f\u5e38\u89c1\u9519\u8bef\u53ca\u5176\u89e3\u51b3\u65b9\u6cd5&#xff1a;<\/p>\n<h4>\u95ee\u9898 1&#xff1a;Cannot create snapshot, directory is not a snapshot root<\/h4>\n<p>\u539f\u56e0&#xff1a;\u76ee\u6807\u76ee\u5f55\u672a\u542f\u7528\u5feb\u7167\u529f\u80fd\u3002<\/p>\n<p>\u89e3\u51b3\u65b9\u6848&#xff1a;<\/p>\n<p>hdfs dfsadmin <span class=\"token parameter variable\">-allowSnapshot<\/span> \/your\/path<\/p>\n<p>\u7136\u540e\u518d\u5c1d\u8bd5\u521b\u5efa\u5feb\u7167\u3002<\/p>\n<hr \/>\n<h4>\u95ee\u9898 2&#xff1a;Snapshot root has too many snapshots<\/h4>\n<p>\u539f\u56e0&#xff1a;HDFS \u9ed8\u8ba4\u9650\u5236\u6bcf\u4e2a\u76ee\u5f55\u6700\u591a 65536 \u4e2a\u5feb\u7167\u3002\u867d\u7136\u8fd9\u4e2a\u6570\u5b57\u5f88\u5927&#xff0c;\u4f46\u5728\u6781\u7aef\u81ea\u52a8\u5316\u573a\u666f\u4e0b\u53ef\u80fd\u8fbe\u5230\u4e0a\u9650\u3002<\/p>\n<p>\u89e3\u51b3\u65b9\u6848&#xff1a;<\/p>\n<ul>\n<li>\u5220\u9664\u65e0\u7528\u5feb\u7167&#xff1a;hdfs snapshot -delete &lt;path&gt; &lt;name&gt;<\/li>\n<li>\u68c0\u67e5\u5f53\u524d\u6570\u91cf&#xff1a;hdfs snapshot -list &lt;path&gt; \u67e5\u770b\u603b\u6570<\/li>\n<li>\u8c03\u6574\u53c2\u6570&#xff08;\u4e0d\u63a8\u8350&#xff09;&#xff1a;\u53ef\u901a\u8fc7 dfs.namenode.snapshot.max-limit \u4fee\u6539\u4e0a\u9650&#xff0c;\u4f46\u4f1a\u5f71\u54cd NameNode \u5185\u5b58\u538b\u529b<\/li>\n<\/ul>\n<hr \/>\n<h4>\u95ee\u9898 3&#xff1a;\u5220\u9664\u6587\u4ef6\u5f88\u6162<\/h4>\n<p>\u539f\u56e0&#xff1a;\u8be5\u6587\u4ef6\u88ab\u591a\u4e2a\u5feb\u7167\u5f15\u7528&#xff0c;NameNode \u9700\u9010\u4e2a\u68c0\u67e5\u5f15\u7528\u5173\u7cfb\u3002<\/p>\n<p>\u89e3\u51b3\u65b9\u6848&#xff1a;<\/p>\n<ul>\n<li>\u51cf\u5c11\u5feb\u7167\u6570\u91cf<\/li>\n<li>\u907f\u514d\u5728\u9ad8\u9891\u7387\u5199\u5165\u76ee\u5f55\u4e0a\u521b\u5efa\u8fc7\u591a\u5feb\u7167<\/li>\n<li>\u4f7f\u7528 hdfs snapshot -diff \u5206\u6790\u54ea\u4e9b\u5feb\u7167\u5305\u542b\u5927\u6587\u4ef6\u53d8\u66f4<\/li>\n<\/ul>\n<hr \/>\n<h4>\u95ee\u9898 4&#xff1a;\u5feb\u7167\u5360\u7528\u7a7a\u95f4\u8fc7\u5927<\/h4>\n<p>\u539f\u56e0&#xff1a;\u5927\u91cf\u6587\u4ef6\u88ab\u53cd\u590d\u4fee\u6539&#xff0c;\u5bfc\u81f4\u5386\u53f2\u5757\u7d2f\u79ef\u3002<\/p>\n<p>\u8bca\u65ad\u65b9\u6cd5&#xff1a;<\/p>\n<p><span class=\"token comment\"># \u67e5\u770b\u6587\u4ef6\u5757\u5206\u5e03<\/span><br \/>\nhdfs <span class=\"token function\">fsck<\/span> \/path\/to\/file <span class=\"token parameter variable\">-files<\/span> <span class=\"token parameter variable\">-blocks<\/span> <span class=\"token parameter variable\">-locations<\/span><\/p>\n<p>\u89c2\u5bdf\u662f\u5426\u6709\u591a\u4e2a\u7248\u672c\u7684\u5757\u5b58\u5728\u3002<\/p>\n<p>\u4f18\u5316\u5efa\u8bae&#xff1a;<\/p>\n<ul>\n<li>\u5bf9\u9891\u7e41\u53d8\u66f4\u7684\u76ee\u5f55\u5173\u95ed\u5feb\u7167<\/li>\n<li>\u6539\u7528\u65e5\u5fd7\u5f0f\u5907\u4efd&#xff08;\u5982 Kafka &#043; Flume &#043; HDFS&#xff09;<\/li>\n<li>\u7ed3\u5408\u51b7\u70ed\u6570\u636e\u5206\u5c42\u7b56\u7565&#xff0c;\u5c06\u5386\u53f2\u5feb\u7167\u8fc1\u79fb\u5230\u4f4e\u6210\u672c\u5b58\u50a8<\/li>\n<\/ul>\n<hr \/>\n<h3>\u4e0e\u5176\u4ed6\u5907\u4efd\u65b9\u6848\u7684\u5bf9\u6bd4 &#x1f19a;<\/h3>\n<table>\n<tr>\u65b9\u6848\u4f18\u70b9\u7f3a\u70b9\u9002\u7528\u573a\u666f<\/tr>\n<tbody>\n<tr>\n<td>HDFS \u5feb\u7167<\/td>\n<td>\u79d2\u7ea7\u521b\u5efa\u3001\u96f6\u62f7\u8d1d\u3001\u8282\u7701\u7a7a\u95f4<\/td>\n<td>\u540c\u96c6\u7fa4\u5185&#xff0c;\u65e0\u6cd5\u9632\u707e<\/td>\n<td>\u672c\u5730\u7248\u672c\u63a7\u5236\u3001\u5feb\u901f\u56de\u6eda<\/td>\n<\/tr>\n<tr>\n<td>DistCp<\/td>\n<td>\u652f\u6301\u8de8\u96c6\u7fa4\u3001\u5b8c\u6574\u526f\u672c<\/td>\n<td>\u8017\u65f6\u957f\u3001\u5360\u53cc\u500d\u7a7a\u95f4<\/td>\n<td>\u5f02\u5730\u5bb9\u707e\u3001\u5f52\u6863\u5907\u4efd<\/td>\n<\/tr>\n<tr>\n<td>HBase Replication<\/td>\n<td>\u5b9e\u65f6\u540c\u6b65\u3001\u4f4e\u5ef6\u8fdf<\/td>\n<td>\u4ec5\u9650 HBase<\/td>\n<td>NoSQL \u6570\u636e\u590d\u5236<\/td>\n<\/tr>\n<tr>\n<td>\u7b2c\u4e09\u65b9\u5de5\u5177&#xff08;\u5982 Veeam&#xff09;<\/td>\n<td>\u56fe\u5f62\u5316\u754c\u9762\u3001\u96c6\u4e2d\u7ba1\u7406<\/td>\n<td>\u6210\u672c\u9ad8\u3001\u517c\u5bb9\u6027\u5dee<\/td>\n<td>\u4f01\u4e1a\u7ea7\u4e00\u4f53\u5316\u5907\u4efd<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&#x1f310; \u5bf9\u6bd4\u5206\u6790\u53c2\u8003\u81ea Hortonworks \u6280\u672f\u767d\u76ae\u4e66&#xff1a;Data Protection Strategies in Hadoop<\/p>\n<p>\u7ed3\u8bba&#xff1a;HDFS \u5feb\u7167\u6700\u9002\u5408\u505a\u7b2c\u4e00\u9053\u9632\u7ebf&#xff0c;\u5373\u672c\u5730\u3001\u5feb\u901f\u3001\u4f4e\u6210\u672c\u7684\u4fdd\u62a4\u624b\u6bb5&#xff0c;\u800c DistCp \u7b49\u65b9\u6848\u4f5c\u4e3a\u7b2c\u4e8c\u5c42\u4fdd\u969c&#xff0c;\u5f62\u6210\u7eb5\u6df1\u9632\u5fa1\u4f53\u7cfb\u3002<\/p>\n<hr \/>\n<h3>\u672a\u6765\u53d1\u5c55\u65b9\u5411\u4e0e\u589e\u5f3a\u5efa\u8bae &#x1f680;<\/h3>\n<p>\u968f\u7740\u4e91\u539f\u751f\u548c Kubernetes \u5728\u5927\u6570\u636e\u9886\u57df\u7684\u666e\u53ca&#xff0c;HDFS \u5feb\u7167\u673a\u5236\u4e5f\u5728\u6301\u7eed\u6f14\u8fdb\u3002<\/p>\n<h4>1. \u4e0e\u5bf9\u8c61\u5b58\u50a8\u96c6\u6210 \u2601\ufe0f<\/h4>\n<p>\u73b0\u4ee3\u6570\u636e\u6e56\u67b6\u6784\u8d8b\u5411\u4e8e\u5c06\u51b7\u6570\u636e\u4e0b\u6c89\u81f3 S3\u3001OSS \u6216 ABFS\u3002\u672a\u6765\u7684\u5feb\u7167\u7cfb\u7edf\u6709\u671b\u652f\u6301\u201c\u5f52\u6863\u5feb\u7167\u201d\u529f\u80fd&#xff0c;\u5373\u5c06\u4e0d\u6d3b\u8dc3\u7684\u5feb\u7167\u81ea\u52a8\u8fc1\u79fb\u81f3\u4f4e\u6210\u672c\u5bf9\u8c61\u5b58\u50a8&#xff0c;\u540c\u65f6\u4fdd\u7559\u5143\u6570\u636e\u7d22\u5f15&#xff0c;\u5b9e\u73b0\u900f\u660e\u8bbf\u95ee\u3002<\/p>\n<h4>2. \u65f6\u95f4\u65c5\u884c\u67e5\u8be2&#xff08;Time Travel Query&#xff09;\u23f3<\/h4>\n<p>\u7c7b\u4f3c Delta Lake \u7684 SELECT * FROM table VERSION AS OF &#039;2025-04-01&#039;&#xff0c;HDFS \u53ef\u6269\u5c55\u5feb\u7167 API&#xff0c;\u5141\u8bb8 SQL \u5f15\u64ce\u76f4\u63a5\u67e5\u8be2\u5386\u53f2\u5feb\u7167\u7248\u672c&#xff0c;\u63d0\u5347\u6570\u636e\u5206\u6790\u7075\u6d3b\u6027\u3002<\/p>\n<h4>3. \u81ea\u52a8\u5316\u667a\u80fd\u5feb\u7167 &#x1f916;<\/h4>\n<p>\u7ed3\u5408 AIops \u601d\u8def&#xff0c;\u7cfb\u7edf\u53ef\u6839\u636e\u8bbf\u95ee\u6a21\u5f0f\u3001\u53d8\u66f4\u9891\u7387\u3001\u4e1a\u52a1\u5468\u671f\u7b49\u7279\u5f81&#xff0c;\u52a8\u6001\u51b3\u5b9a\u662f\u5426\u521b\u5efa\u5feb\u7167\u3001\u4fdd\u7559\u591a\u4e45\u3001\u4f55\u65f6\u538b\u7f29&#xff0c;\u5b9e\u73b0\u667a\u80fd\u5316\u6570\u636e\u4fdd\u62a4\u3002<\/p>\n<hr \/>\n<h3>\u7ed3\u8bed &#x1f308;<\/h3>\n<p>HDFS \u5feb\u7167\u673a\u5236\u662f\u4e00\u9879\u5f3a\u5927\u800c\u5b9e\u7528\u7684\u529f\u80fd&#xff0c;\u5b83\u4ee5\u6781\u4f4e\u7684\u4ee3\u4ef7\u5b9e\u73b0\u4e86\u6570\u636e\u7684\u65f6\u95f4\u70b9\u4fdd\u62a4\u3002\u65e0\u8bba\u662f\u5e94\u5bf9\u4eba\u4e3a\u8bef\u64cd\u4f5c\u3001\u652f\u6301\u7070\u5ea6\u53d1\u5e03&#xff0c;\u8fd8\u662f\u6784\u5efa\u7a33\u5065\u7684\u5907\u4efd\u4f53\u7cfb&#xff0c;\u5feb\u7167\u90fd\u80fd\u53d1\u6325\u91cd\u8981\u4f5c\u7528\u3002<\/p>\n<p>\u901a\u8fc7\u672c\u6587\u7684\u5b66\u4e60&#xff0c;\u4f60\u5e94\u8be5\u5df2\u7ecf\u638c\u63e1\u4e86&#xff1a;<\/p>\n<ul>\n<li>\u5feb\u7167\u7684\u57fa\u672c\u6982\u5ff5\u4e0e\u5de5\u4f5c\u539f\u7406 &#x1f4a1;<\/li>\n<li>\u547d\u4ee4\u884c\u4e0e Java API \u7684\u4f7f\u7528\u65b9\u6cd5 &#x1f4bb;<\/li>\n<li>\u5b9e\u9645\u5907\u4efd\u4e0e\u6062\u590d\u7684\u64cd\u4f5c\u6d41\u7a0b &#x1f501;<\/li>\n<li>\u6027\u80fd\u5f71\u54cd\u4e0e\u6700\u4f73\u5b9e\u8df5\u5efa\u8bae &#x1f3c6;<\/li>\n<li>\u4e0e\u5176\u4ed6\u65b9\u6848\u7684\u5bf9\u6bd4\u4e0e\u9009\u578b\u601d\u8def &#x1f19a;<\/li>\n<\/ul>\n<p>\u6280\u672f\u7684\u4ef7\u503c\u5728\u4e8e\u843d\u5730\u3002\u5efa\u8bae\u4f60\u5728\u6d4b\u8bd5\u73af\u5883\u4e2d\u52a8\u624b\u5b9e\u8df5\u4e0a\u8ff0\u547d\u4ee4\u4e0e\u4ee3\u7801&#xff0c;\u4eb2\u8eab\u4f53\u9a8c\u5feb\u7167\u5e26\u6765\u7684\u4fbf\u5229\u3002\u8bb0\u4f4f&#xff1a;\u6700\u597d\u7684\u5907\u4efd&#xff0c;\u662f\u4f60\u4ece\u672a\u9700\u8981\u4f7f\u7528\u7684\u90a3\u4e00\u4e2a\u3002\u4f46\u5f53\u5371\u673a\u6765\u4e34&#xff0c;\u5b83\u5c06\u6210\u4e3a\u4f60\u6700\u575a\u5b9e\u7684\u540e\u76fe\u3002&#x1f6e1;\ufe0f<\/p>\n<p>\u613f\u4f60\u7684\u6570\u636e\u6c38\u8fdc\u5b89\u5168&#xff0c;\u7cfb\u7edf\u59cb\u7ec8\u7a33\u5b9a&#xff0c;\u4eba\u751f\u4e00\u8def\u987a\u9042&#xff01;&#x1f680;\u2728<\/p>\n<hr \/>\n<p>&#x1f64c; \u611f\u8c22\u4f60\u8bfb\u5230\u8fd9\u91cc&#xff01; &#x1f50d; \u6280\u672f\u4e4b\u8def\u6ca1\u6709\u6377\u5f84&#xff0c;\u4f46\u6bcf\u4e00\u6b21\u9605\u8bfb\u3001\u601d\u8003\u548c\u5b9e\u8df5&#xff0c;\u90fd\u5728\u6084\u6084\u62c9\u8fd1\u4f60\u4e0e\u76ee\u6807\u7684\u8ddd\u79bb\u3002 &#x1f4a1; \u5982\u679c\u672c\u6587\u5bf9\u4f60\u6709\u5e2e\u52a9&#xff0c;\u4e0d\u59a8 &#x1f44d; \u70b9\u8d5e\u3001&#x1f4cc; \u6536\u85cf\u3001&#x1f4e4; \u5206\u4eab \u7ed9\u66f4\u591a\u9700\u8981\u7684\u670b\u53cb&#xff01; &#x1f4ac; \u6b22\u8fce\u5728\u8bc4\u8bba\u533a\u7559\u4e0b\u4f60\u7684\u60f3\u6cd5\u3001\u7591\u95ee\u6216\u5efa\u8bae&#xff0c;\u6211\u4f1a\u4e00\u4e00\u56de\u590d&#xff0c;\u6211\u4eec\u4e00\u8d77\u4ea4\u6d41\u3001\u5171\u540c\u6210\u957f &#x1f33f; &#x1f514; \u5173\u6ce8\u6211&#xff0c;\u4e0d\u9519\u8fc7\u4e0b\u4e00\u7bc7\u5e72\u8d27&#xff01;\u6211\u4eec\u4e0b\u671f\u518d\u89c1&#xff01;\u2728<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&#x1f44b; \u5927\u5bb6\u597d&#xff0c;\u6b22\u8fce\u6765\u5230\u6211\u7684\u6280\u672f\u535a\u5ba2&#xff01; &#x1f4da; \u5728\u8fd9\u91cc&#xff0c;\u6211\u4f1a\u5206\u4eab\u5b66\u4e60\u7b14\u8bb0\u3001\u5b9e\u6218\u7ecf\u9a8c\u4e0e\u6280\u672f\u601d\u8003&#xff0c;\u529b\u6c42\u7528\u7b80\u5355\u7684\u65b9\u5f0f\u8bb2\u6e05\u695a\u590d\u6742\u7684\u95ee\u9898\u3002 &#x1f3af; \u672c\u6587\u5c06\u56f4\u7ed5HDFS\u8fd9\u4e2a\u8bdd\u9898\u5c55\u5f00&#xff0c;\u5e0c\u671b\u80fd\u4e3a\u4f60\u5e26\u6765\u4e00\u4e9b\u542f\u53d1\u6216\u5b9e\u7528\u7684\u53c2\u8003\u3002 &#x1f331; \u65e0\u8bba\u4f60\u662f\u521a\u5165\u95e8\u7684\u65b0\u624b&#xff0c;\u8fd8\u662f\u6b63\u5728\u8fdb\u9636\u7684\u5f00\u53d1\u8005&#xff0c;\u5e0c\u671b\u4f60\u90fd\u80fd\u6709\u6240\u6536\u83b7&#xff01; \u6587\u7ae0\u76ee\u5f55HDFS &#8211; 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