{"id":97414,"date":"2026-08-29T13:41:06","date_gmt":"2026-08-29T05:41:06","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/97414.html"},"modified":"2026-08-29T13:41:06","modified_gmt":"2026-08-29T05:41:06","slug":"sqoop%e5%88%86%e7%89%87%e4%bc%98%e5%8c%96%e6%8c%87%e5%8d%97%ef%bc%9a%e5%a6%82%e4%bd%95%e9%80%9a%e8%bf%87-split-by-%e5%ae%9e%e7%8e%b0%e9%ab%98%e6%95%88%e5%b9%b6%e8%a1%8c%e5%af%bc%e5%85%a5","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/97414.html","title":{"rendered":"Sqoop\u5206\u7247\u4f18\u5316\u6307\u5357\uff1a\u5982\u4f55\u901a\u8fc7 --split-by \u5b9e\u73b0\u9ad8\u6548\u5e76\u884c\u5bfc\u5165"},"content":{"rendered":"<\/p>\n<h4>Sqoop\u5206\u7247\u4f18\u5316\u6307\u5357&#xff1a;\u5982\u4f55\u901a\u8fc7 &#8211;split-by \u5b9e\u73b0\u9ad8\u6548\u5e76\u884c\u5bfc\u5165<\/h4>\n<ul>\n<li>\n<ul>\n<li>1. \u5f15\u8a00&#xff1a;\u5e76\u884c\u5bfc\u5165\u7684\u6838\u5fc3\u5728\u4e8e\u5206\u7247<\/li>\n<li>2. \u6570\u636e\u5206\u7247\u7684\u6838\u5fc3\u539f\u7406<\/li>\n<li>\n<ul>\n<li>2.1 \u4ec0\u4e48\u662f\u6570\u636e\u5206\u7247&#xff1f;<\/li>\n<li>2.2 \u5206\u7247\u662f\u5982\u4f55\u8ba1\u7b97\u7684&#xff1f;<\/li>\n<li>2.3 &#096;&#8211;split-by&#096; \u7684\u6838\u5fc3\u4f5c\u7528<\/li>\n<\/ul>\n<\/li>\n<li>3. \u5206\u7247\u5217\u7684\u6570\u636e\u7c7b\u578b\u652f\u6301<\/li>\n<li>\n<ul>\n<li>3.1 \u652f\u6301\u7684\u5b57\u6bb5\u7c7b\u578b<\/li>\n<li>3.2 INT\u7c7b\u578b\u7684\u5206\u7247\u673a\u5236<\/li>\n<li>3.3 DATE\u7c7b\u578b\u7684\u5206\u7247\u673a\u5236<\/li>\n<li>3.4 VARCHAR\u7c7b\u578b\u7684\u5206\u7247\u673a\u5236&#xff08;\u7279\u6b8a\u914d\u7f6e&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>4. \u6570\u636e\u503e\u659c&#xff1a;\u5206\u7247\u4e0d\u5747\u7684\u6839\u6e90<\/li>\n<li>\n<ul>\n<li>4.1 \u4ec0\u4e48\u662f\u6570\u636e\u503e\u659c&#xff1f;<\/li>\n<li>4.2 \u5206\u7247\u5217\u5bfc\u81f4\u503e\u659c\u7684\u539f\u56e0<\/li>\n<li>4.3 \u5982\u4f55\u8bc6\u522b\u6570\u636e\u503e\u659c&#xff1f;<\/li>\n<\/ul>\n<\/li>\n<li>5. \u4f18\u5316\u7b56\u7565\u4e00&#xff1a;\u9009\u62e9\u7406\u60f3\u7684\u5206\u7247\u5217<\/li>\n<li>\n<ul>\n<li>5.1 \u7406\u60f3\u5206\u7247\u5217\u7684\u4e09\u5927\u7279\u5f81<\/li>\n<li>5.2 \u6700\u4f73\u5b9e\u8df5\u5efa\u8bae<\/li>\n<li>5.3 \u907f\u514d\u4f7f\u7528\u4f4e\u57fa\u6570\u5217<\/li>\n<\/ul>\n<\/li>\n<li>6. \u4f18\u5316\u7b56\u7565\u4e8c&#xff1a;\u4f7f\u7528 &#096;&#8211;boundary-query&#096; \u81ea\u5b9a\u4e49\u8fb9\u754c<\/li>\n<li>\n<ul>\n<li>6.1 \u4ec0\u4e48\u662f &#096;&#8211;boundary-query&#096;&#xff1f;<\/li>\n<li>6.2 \u9002\u7528\u573a\u666f<\/li>\n<li>6.3 \u547d\u4ee4\u793a\u4f8b<\/li>\n<\/ul>\n<\/li>\n<li>7. \u4f18\u5316\u7b56\u7565\u4e09&#xff1a;\u52a8\u6001\u751f\u6210\u865a\u62df\u5206\u7247\u5217&#xff08;\u7ec8\u6781\u65b9\u6848&#xff09;<\/li>\n<li>\n<ul>\n<li>7.1 \u6838\u5fc3\u601d\u60f3<\/li>\n<li>7.2 \u547d\u4ee4\u793a\u4f8b<\/li>\n<li>7.3 \u539f\u7406\u8bf4\u660e<\/li>\n<\/ul>\n<\/li>\n<li>8. \u5206\u7247\u4f18\u5316\u5b9e\u6218\u811a\u672c<\/li>\n<li>\n<ul>\n<li>8.1 \u666e\u901a\u573a\u666f\u4f18\u5316\u811a\u672c<\/li>\n<li>8.2 \u6570\u636e\u503e\u659c\u573a\u666f\u89e3\u51b3\u65b9\u6848<\/li>\n<\/ul>\n<\/li>\n<li>9. \u5e38\u89c1\u95ee\u9898\u4e0e\u6392\u67e5<\/li>\n<li>\n<ul>\n<li>9.1 \u95ee\u9898&#xff1a;\u5206\u7247\u5217\u5305\u542bNULL\u503c<\/li>\n<li>9.2 \u95ee\u9898&#xff1a;\u5206\u7247\u540e\u6570\u636e\u4e0d\u5747\u5300<\/li>\n<li>9.3 \u95ee\u9898&#xff1a;MIN\/MAX\u67e5\u8be2\u592a\u6162<\/li>\n<\/ul>\n<\/li>\n<li>10. \u603b\u7ed3<\/li>\n<li>\n<ul>\n<li>10.1 \u6838\u5fc3\u8981\u70b9\u56de\u987e<\/li>\n<li>10.2 \u5206\u7247\u5217\u9009\u62e9\u4f18\u5148\u7ea7<\/li>\n<li>10.3 \u6700\u7ec8\u5efa\u8bae<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<table width=\"100%\">\n<tbody>\n<tr>\n<td width=\"50%\">\n<p>     <font face=\"STCAIYUN\" color=\"red\" size=\"4\">&#x1f33a;The Begin&#x1f33a;\u70b9\u70b9\u5173\u6ce8&#xff0c;\u6536\u85cf\u4e0d\u8ff7\u8def&#x1f33a;<\/font>\n     <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>1. \u5f15\u8a00&#xff1a;\u5e76\u884c\u5bfc\u5165\u7684\u6838\u5fc3\u5728\u4e8e\u5206\u7247<\/h3>\n<p>\u5728\u4f7f\u7528Sqoop\u4ece\u5173\u7cfb\u578b\u6570\u636e\u5e93\u5411Hadoop\u5bfc\u5165\u6d77\u91cf\u6570\u636e\u65f6&#xff0c;\u5e76\u884c\u5316\u662f\u63d0\u5347\u6548\u7387\u7684\u5173\u952e\u3002\u800c\u5e76\u884c\u5316\u7684\u57fa\u77f3&#xff0c;\u5c31\u662f\u6570\u636e\u5206\u7247&#xff08;Splitting&#xff09;\u3002<\/p>\n<p>Sqoop\u901a\u8fc7\u5c06\u4e00\u5f20\u5927\u8868\u5207\u5206\u6210\u591a\u4e2a\u5c0f\u7247&#xff0c;\u5206\u914d\u7ed9\u4e0d\u540c\u7684Map\u4efb\u52a1\u5e76\u884c\u5904\u7406&#xff0c;\u4ece\u800c\u5b9e\u73b0\u6570\u636e\u7684\u9ad8\u901f\u4f20\u8f93\u3002\u8fd9\u4e2a\u5207\u5206\u8fc7\u7a0b\u7684\u6838\u5fc3\u53c2\u6570\u5c31\u662f &#8211;split-by\u3002<\/p>\n<p>\u7136\u800c&#xff0c;\u5f88\u591a\u4eba\u5728\u4f7f\u7528&#8211;split-by\u65f6\u5b58\u5728\u8bef\u533a&#xff1a;<\/p>\n<ul>\n<li>\u8ba4\u4e3a\u53ea\u8981\u6307\u5b9a\u4e86\u5206\u7247\u5217\u5c31\u80fd\u81ea\u52a8\u5747\u5300\u5207\u5206<\/li>\n<li>\u5ffd\u7565\u4e86\u5206\u7247\u5217\u7684\u6570\u636e\u5206\u5e03\u7279\u6027<\/li>\n<li>\u9047\u5230\u6570\u636e\u503e\u659c\u65f6\u675f\u624b\u65e0\u7b56<\/li>\n<\/ul>\n<p>\u672c\u6587\u5c06\u6df1\u5165\u5256\u6790&#8211;split-by\u7684\u5de5\u4f5c\u539f\u7406&#xff0c;\u5e76\u5206\u4eab\u5982\u4f55\u901a\u8fc7\u4f18\u5316\u5206\u7247\u7b56\u7565\u6765\u63d0\u5347\u5bfc\u5165\u6027\u80fd\u3002<\/p>\n<h3>2. \u6570\u636e\u5206\u7247\u7684\u6838\u5fc3\u539f\u7406<\/h3>\n<h4>2.1 \u4ec0\u4e48\u662f\u6570\u636e\u5206\u7247&#xff1f;<\/h4>\n<p>Sqoop\u5728\u5bfc\u5165\u6570\u636e\u65f6&#xff0c;\u4f1a\u5c06\u4e00\u5f20\u8868\u7684\u6570\u636e\u5207\u5206\u6210\u591a\u4e2a\u5206\u7247&#xff08;Split&#xff09;&#xff0c;\u6bcf\u4e2a\u5206\u7247\u7531\u4e00\u4e2aMap\u4efb\u52a1\u8d1f\u8d23\u5904\u7406\u3002\u5206\u7247\u7684\u6570\u91cf\u7531&#8211;num-mappers&#xff08;\u6216-m&#xff09;\u53c2\u6570\u63a7\u5236&#xff0c;\u9ed8\u8ba4\u662f4\u4e2a\u3002<\/p>\n<p>\u5206\u7247\u673a\u5236\u7684\u6838\u5fc3\u601d\u60f3\u662f&#xff1a;\u6839\u636e\u67d0\u4e2a\u5217\u7684\u53d6\u503c\u8303\u56f4&#xff0c;\u5c06\u6570\u636e\u5747\u5300\u5730\u5212\u5206\u6210\u591a\u4e2a\u533a\u95f4\u3002<\/p>\n<h4>2.2 \u5206\u7247\u662f\u5982\u4f55\u8ba1\u7b97\u7684&#xff1f;<\/h4>\n<p>\u5f53\u6267\u884cSqoop\u5bfc\u5165\u547d\u4ee4\u65f6&#xff0c;\u540e\u53f0\u4f1a\u7ecf\u5386\u4ee5\u4e0b\u6b65\u9aa4&#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260829054101-6a9270ed4755c.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u5177\u4f53\u8ba1\u7b97\u793a\u4f8b&#xff1a;<\/p>\n<p>\u5047\u8bbeid\u5217\u7684\u6700\u5c0f\u503c\u4e3a1&#xff0c;\u6700\u5927\u503c\u4e3a1000&#xff0c;\u8bbe\u7f6e-m 4&#xff0c;\u5219&#xff1a;<\/p>\n<ul>\n<li>\u6b65\u957f &#061; (1000 &#8211; 1) \/ 4 &#061; 249.75 \u2248 250<\/li>\n<li>\u56db\u4e2aMap\u4efb\u52a1\u6267\u884c\u7684\u67e5\u8be2\u6761\u4ef6\u5206\u522b\u662f&#xff1a;\n<ul>\n<li>Map1: WHERE id &gt;&#061; 1 AND id &lt; 251<\/li>\n<li>Map2: WHERE id &gt;&#061; 251 AND id &lt; 501<\/li>\n<li>Map3: WHERE id &gt;&#061; 501 AND id &lt; 751<\/li>\n<li>Map4: WHERE id &gt;&#061; 751 AND id &lt;&#061; 1000<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4>2.3 &#8211;split-by \u7684\u6838\u5fc3\u4f5c\u7528<\/h4>\n<p>&#8211;split-by\u53c2\u6570\u5c31\u662f\u7528\u6765\u6307\u5b9a\u4ee5\u54ea\u4e00\u5217\u4e3a\u4f9d\u636e\u8fdb\u884c\u6570\u636e\u5207\u5206\u7684\u3002\u5b83\u7684\u6838\u5fc3\u4f5c\u7528\u5305\u62ec&#xff1a;<\/p>\n<table>\n<tr>\u4f5c\u7528\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">\u51b3\u5b9a\u5206\u7247\u4f9d\u636e<\/td>\n<td align=\"left\">\u544a\u8bc9Sqoop\u4f7f\u7528\u54ea\u4e2a\u5217\u7684\u503c\u6765\u8ba1\u7b97\u5206\u7247\u8fb9\u754c<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u5f71\u54cd\u6570\u636e\u5206\u5e03<\/td>\n<td align=\"left\">\u5206\u7247\u5217\u7684\u5206\u5e03\u7279\u6027\u76f4\u63a5\u51b3\u5b9a\u6570\u636e\u662f\u5426\u5747\u5300<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u63d0\u5347\u5e76\u884c\u6548\u7387<\/td>\n<td align=\"left\">\u5408\u7406\u7684\u5206\u7247\u5217\u80fd\u8ba9\u6bcf\u4e2aMap\u4efb\u52a1\u5904\u7406\u5927\u81f4\u76f8\u540c\u7684\u6570\u636e\u91cf<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5982\u679c\u4e0d\u6307\u5b9a&#8211;split-by&#xff0c;Sqoop\u4f1a\u9ed8\u8ba4\u4f7f\u7528\u8868\u7684\u4e3b\u952e\u4f5c\u4e3a\u5206\u7247\u5217\u3002\u4f46\u5982\u679c\u4e3b\u952e\u5206\u5e03\u4e0d\u5747\u5300&#xff0c;\u5c31\u9700\u8981\u624b\u52a8\u6307\u5b9a\u66f4\u5408\u9002\u7684\u5217\u3002<\/p>\n<h3>3. \u5206\u7247\u5217\u7684\u6570\u636e\u7c7b\u578b\u652f\u6301<\/h3>\n<h4>3.1 \u652f\u6301\u7684\u5b57\u6bb5\u7c7b\u578b<\/h4>\n<p>Sqoop\u7684&#8211;split-by\u5bf9\u4e0d\u540c\u6570\u636e\u7c7b\u578b\u7684\u652f\u6301\u60c5\u51b5\u5982\u4e0b&#xff1a;<\/p>\n<table>\n<tr>\u6570\u636e\u7c7b\u578b\u652f\u6301\u60c5\u51b5\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">INT\u7c7b\u578b<\/td>\n<td align=\"left\">\u2705 \u5b8c\u7f8e\u652f\u6301<\/td>\n<td align=\"left\">\u6700\u7406\u60f3\u7684\u7c7b\u578b&#xff0c;\u5206\u7247\u8ba1\u7b97\u7cbe\u786e<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">DATE\/TIMESTAMP<\/td>\n<td align=\"left\">\u2705 \u652f\u6301<\/td>\n<td align=\"left\">\u5185\u90e8\u4f1a\u8f6c\u6362\u4e3a\u65f6\u95f4\u6233\u8fdb\u884c\u8ba1\u7b97<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">VARCHAR\/CHAR<\/td>\n<td align=\"left\">\u26a0\ufe0f \u6709\u9650\u652f\u6301<\/td>\n<td align=\"left\">\u9700\u8981\u989d\u5916\u53c2\u6570&#xff0c;\u5206\u7247\u903b\u8f91\u590d\u6742<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u5176\u4ed6\u7c7b\u578b<\/td>\n<td align=\"left\">\u274c \u4e0d\u652f\u6301<\/td>\n<td align=\"left\">\u53ef\u80fd\u5bfc\u81f4\u4efb\u52a1\u5931\u8d25<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>3.2 INT\u7c7b\u578b\u7684\u5206\u7247\u673a\u5236<\/h4>\n<p>\u5bf9\u4e8eINT\u7c7b\u578b\u7684\u5b57\u6bb5&#xff0c;Sqoop\u7684\u8ba1\u7b97\u903b\u8f91\u662f&#xff1a;[MIN, MIN&#043;\u6b65\u957f), [MIN&#043;\u6b65\u957f, MIN&#043;2*\u6b65\u957f), &#8230;, [MIN&#043;(n-1)*\u6b65\u957f, MAX]\u3002<\/p>\n<p>\u5173\u952e\u7279\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u533a\u95f4\u662f\u5de6\u95ed\u53f3\u5f00&#xff08;[start, end)&#xff09;&#xff0c;\u6700\u540e\u4e00\u4e2a\u533a\u95f4\u662f[last_start, MAX]<\/li>\n<li>\u5206\u7247\u6570\u91cf\u4e25\u683c\u7b49\u4e8e-m\u6307\u5b9a\u7684\u6570\u91cf<\/li>\n<li>\u5206\u7247\u5747\u5300\u7a0b\u5ea6\u5b8c\u5168\u53d6\u51b3\u4e8e\u6570\u636e\u5206\u5e03<\/li>\n<\/ul>\n<h4>3.3 DATE\u7c7b\u578b\u7684\u5206\u7247\u673a\u5236<\/h4>\n<p>\u5bf9\u4e8eDATE\/TIMESTAMP\u7c7b\u578b&#xff0c;Sqoop\u4f1a\u5148\u5c06\u65e5\u671f\u8f6c\u6362\u4e3a\u65f6\u95f4\u6233&#xff08;\u6beb\u79d2\u6570&#xff09;&#xff0c;\u7136\u540e\u6309\u7167INT\u7c7b\u578b\u7684\u903b\u8f91\u8fdb\u884c\u5206\u7247\u3002<\/p>\n<p>\u8ba1\u7b97\u793a\u4f8b&#xff1a;<\/p>\n<p>&#8211;split-by create_time<br \/>\n<span class=\"token parameter variable\">-m<\/span> <span class=\"token number\">4<\/span><\/p>\n<p>\u5047\u8bbeMIN(create_time) &#061; \u20182020-01-01\u2019&#xff08;1577808000000\u6beb\u79d2&#xff09; MAX(create_time) &#061; \u20182023-12-31\u2019&#xff08;1703980800000\u6beb\u79d2&#xff09; \u6b65\u957f &#061; (1703980800000 &#8211; 1577808000000) \/ 4 &#061; 31543200000\u6beb\u79d2 \u2248 365\u5929<\/p>\n<h4>3.4 VARCHAR\u7c7b\u578b\u7684\u5206\u7247\u673a\u5236&#xff08;\u7279\u6b8a\u914d\u7f6e&#xff09;<\/h4>\n<p>\u9ed8\u8ba4\u60c5\u51b5\u4e0b&#xff0c;&#8211;split-by\u4e0d\u652f\u6301VARCHAR\u7c7b\u578b\u3002\u5982\u679c\u8868\u4e2d\u6ca1\u6709\u6570\u503c\u578b\u6216\u65e5\u671f\u578b\u5b57\u6bb5&#xff0c;\u53ef\u4ee5\u542f\u7528\u4e00\u4e2a\u7279\u6b8a\u53c2\u6570&#xff1a;<\/p>\n<p>sqoop <span class=\"token function\">import<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token parameter variable\">-D<\/span> <span class=\"token assign-left variable\">org.apache.sqoop.splitter.allow_text_splitter<\/span><span class=\"token operator\">&#061;<\/span>true <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token parameter variable\">&#8211;connect<\/span> jdbc:mysql:\/\/dbserver:3306\/business <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token parameter variable\">&#8211;table<\/span> user_info <span class=\"token punctuation\">\\\\<\/span><br \/>\n  &#8211;split-by user_name <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token parameter variable\">-m<\/span> <span class=\"token number\">4<\/span><\/p>\n<p>\u6ce8\u610f&#xff1a;\u6587\u672c\u7c7b\u578b\u7684\u5206\u7247\u6548\u7387\u8f83\u4f4e&#xff0c;\u4e14\u5206\u7247\u7ed3\u679c\u53ef\u80fd\u4e0d\u5747\u5300&#xff0c;\u4e0d\u63a8\u8350\u5728\u751f\u4ea7\u73af\u5883\u5927\u89c4\u6a21\u4f7f\u7528\u3002<\/p>\n<h3>4. \u6570\u636e\u503e\u659c&#xff1a;\u5206\u7247\u4e0d\u5747\u7684\u6839\u6e90<\/h3>\n<h4>4.1 \u4ec0\u4e48\u662f\u6570\u636e\u503e\u659c&#xff1f;<\/h4>\n<p>\u6570\u636e\u503e\u659c\u662f\u6307\u6570\u636e\u5206\u914d\u4e0d\u5747\u5300&#xff0c;\u5bfc\u81f4\u90e8\u5206Map\u4efb\u52a1\u5904\u7406\u4e86\u5927\u91cf\u6570\u636e&#xff0c;\u800c\u5176\u4ed6\u4efb\u52a1\u5904\u7406\u7684\u6570\u636e\u5f88\u5c11&#xff0c;\u751a\u81f3\u7a7a\u95f2\u3002<\/p>\n<p>\u8868\u73b0\u5f62\u5f0f&#xff1a;<\/p>\n<ul>\n<li>\u5927\u90e8\u5206Map\u4efb\u52a1\u5f88\u5feb\u5b8c\u6210<\/li>\n<li>\u4e2a\u522bMap\u4efb\u52a1\u8fd0\u884c\u65f6\u95f4\u6781\u957f<\/li>\n<li>\u6574\u4f53\u4f5c\u4e1a\u8017\u65f6\u88ab\u6700\u6162\u7684\u4efb\u52a1\u62d6\u57ae<\/li>\n<\/ul>\n<h4>4.2 \u5206\u7247\u5217\u5bfc\u81f4\u503e\u659c\u7684\u539f\u56e0<\/h4>\n<p>\u4ece\u5206\u7247\u673a\u5236\u53ef\u4ee5\u770b\u51fa&#xff0c;Sqoop\u5047\u8bbe\u6570\u636e\u5728\u5206\u7247\u5217\u4e0a\u662f\u5747\u5300\u5206\u5e03\u7684\u3002\u4f46\u5f53\u5206\u7247\u5217\u7684\u5b9e\u9645\u5206\u5e03\u4e0d\u5747\u5300\u65f6&#xff0c;\u5c31\u4f1a\u51fa\u73b0\u503e\u659c\u3002<\/p>\n<p>\u793a\u4f8b&#xff1a;\u4f7f\u7528status\u5217&#xff08;\u503c\u53ea\u67090,1,2&#xff09;\u4f5c\u4e3a\u5206\u7247\u5217<\/p>\n<ul>\n<li>MIN&#061;0, MAX&#061;2, \u6b65\u957f&#061;0.5<\/li>\n<li>\u5206\u72471: 0 \u2264 status &lt; 0.5 \u2192 \u5305\u542bstatus&#061;0\u7684\u6570\u636e<\/li>\n<li>\u5206\u72472: 0.5 \u2264 status &lt; 1 \u2192 \u6ca1\u6709\u6570\u636e&#xff08;\u56e0\u4e3a\u6ca1\u67090.5&#xff09;<\/li>\n<li>\u5206\u72473: 1 \u2264 status &lt; 1.5 \u2192 \u5305\u542bstatus&#061;1\u7684\u6570\u636e<\/li>\n<li>\u5206\u72474: 1.5 \u2264 status \u2264 2 \u2192 \u5305\u542bstatus&#061;2\u7684\u6570\u636e<\/li>\n<\/ul>\n<p>\u5982\u679cstatus&#061;0\u7684\u8bb0\u5f55\u6709100\u4e07\u6761&#xff0c;status&#061;1\u7684\u8bb0\u5f55\u670910\u4e07\u6761&#xff0c;status&#061;2\u7684\u8bb0\u5f55\u670910\u4e07\u6761&#xff0c;\u90a3\u4e48Map1\u5c06\u5904\u7406100\u4e07\u6761\u6570\u636e&#xff0c;\u800c\u5176\u4ed6Map\u53ea\u5904\u740610\u4e07\u6761&#xff0c;\u8fd9\u5c31\u662f\u5178\u578b\u7684\u6570\u636e\u503e\u659c\u3002<\/p>\n<h4>4.3 \u5982\u4f55\u8bc6\u522b\u6570\u636e\u503e\u659c&#xff1f;<\/h4>\n<p>\u5728YARN\u7684Web UI\u4e2d&#xff0c;\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u73b0\u8c61\u8bc6\u522b\u6570\u636e\u503e\u659c&#xff1a;<\/p>\n<ul>\n<li>\u8f93\u5165\u8bb0\u5f55\u6570&#xff08;Input Records&#xff09;&#xff1a;\u5404Map\u4efb\u52a1\u7684\u8bb0\u5f55\u6570\u76f8\u5dee\u60ac\u6b8a<\/li>\n<li>\u8fd0\u884c\u65f6\u95f4&#xff08;Duration&#xff09;&#xff1a;\u5c11\u6570\u4efb\u52a1\u8fd0\u884c\u65f6\u95f4\u8fdc\u8d85\u5e73\u5747\u503c<\/li>\n<li>\u6570\u636e\u672c\u5730\u6027&#xff08;Data Locality&#xff09;&#xff1a;\u4e0d\u660e\u663e&#xff0c;\u56e0\u4e3a\u6570\u636e\u6e90\u5728\u6570\u636e\u5e93\u800c\u975eHDFS<\/li>\n<\/ul>\n<h3>5. \u4f18\u5316\u7b56\u7565\u4e00&#xff1a;\u9009\u62e9\u7406\u60f3\u7684\u5206\u7247\u5217<\/h3>\n<h4>5.1 \u7406\u60f3\u5206\u7247\u5217\u7684\u4e09\u5927\u7279\u5f81<\/h4>\n<table>\n<tr>\u7279\u5f81\u8bf4\u660e\u53cd\u4f8b<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">\u9ad8\u57fa\u6570<\/td>\n<td align=\"left\">\u53d6\u503c\u79cd\u7c7b\u591a&#xff0c;\u5206\u5e03\u8303\u56f4\u5e7f<\/td>\n<td align=\"left\">\u6027\u522b&#xff08;2\u79cd&#xff09;\u3001\u72b6\u6001\u7801&#xff08;3\u79cd&#xff09;<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u5747\u5300\u5206\u5e03<\/td>\n<td align=\"left\">\u6bcf\u4e2a\u53d6\u503c\u533a\u95f4\u7684\u6570\u636e\u91cf\u5927\u81f4\u76f8\u7b49<\/td>\n<td align=\"left\">\u70ed\u70b9ID&#xff08;\u67d0\u4e9b\u533a\u95f4\u6570\u636e\u6781\u591a&#xff09;<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u6570\u503c\u7c7b\u578b<\/td>\n<td align=\"left\">\u6700\u597d\u662fINT\u6216DATE\u7c7b\u578b<\/td>\n<td align=\"left\">VARCHAR\u3001TEXT<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>5.2 \u6700\u4f73\u5b9e\u8df5\u5efa\u8bae<\/h4>\n<p><span class=\"token comment\"># \u7406\u60f3\u7684\u5206\u7247\u5217&#xff1a;\u81ea\u589e\u4e3b\u952e<\/span><br \/>\nsqoop <span class=\"token function\">import<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token parameter variable\">&#8211;table<\/span> orders <span class=\"token punctuation\">\\\\<\/span><br \/>\n  &#8211;split-by order_id <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token parameter variable\">-m<\/span> <span class=\"token number\">8<\/span><\/p>\n<p><span class=\"token comment\"># \u6b21\u4f18\u9009\u62e9&#xff1a;\u65f6\u95f4\u6233\u5217&#xff08;\u5206\u5e03\u901a\u5e38\u8f83\u5747\u5300&#xff09;<\/span><br \/>\nsqoop <span class=\"token function\">import<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token parameter variable\">&#8211;table<\/span> user_logs <span class=\"token punctuation\">\\\\<\/span><br \/>\n  &#8211;split-by create_time <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token parameter variable\">-m<\/span> <span class=\"token number\">8<\/span><\/p>\n<h4>5.3 \u907f\u514d\u4f7f\u7528\u4f4e\u57fa\u6570\u5217<\/h4>\n<p><span class=\"token comment\"># \u9519\u8bef\u793a\u4f8b&#xff1a;\u4f7f\u7528status\u5217&#xff08;\u5bfc\u81f4\u4e25\u91cd\u503e\u659c&#xff09;<\/span><br \/>\nsqoop <span class=\"token function\">import<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token parameter variable\">&#8211;table<\/span> orders <span class=\"token punctuation\">\\\\<\/span><br \/>\n  &#8211;split-by status <span class=\"token punctuation\">\\\\<\/span>   <span class=\"token comment\"># \u53ea\u6709\u51e0\u79cd\u53d6\u503c<\/span><br \/>\n  <span class=\"token parameter variable\">-m<\/span> <span class=\"token number\">8<\/span><\/p>\n<h3>6. \u4f18\u5316\u7b56\u7565\u4e8c&#xff1a;\u4f7f\u7528 &#8211;boundary-query \u81ea\u5b9a\u4e49\u8fb9\u754c<\/h3>\n<h4>6.1 \u4ec0\u4e48\u662f &#8211;boundary-query&#xff1f;<\/h4>\n<p>&#8211;boundary-query\u5141\u8bb8\u7528\u6237\u81ea\u5b9a\u4e49\u67e5\u8be2\u6765\u786e\u5b9a\u5206\u7247\u7684\u8fb9\u754c\u503c&#xff0c;\u66ff\u4ee3\u9ed8\u8ba4\u7684SELECT MIN(), MAX()\u67e5\u8be2\u3002<\/p>\n<h4>6.2 \u9002\u7528\u573a\u666f<\/h4>\n<table>\n<tr>\u573a\u666f\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">MIN\/MAX\u67e5\u8be2\u592a\u6162<\/td>\n<td align=\"left\">\u5927\u8868\u65e0\u7d22\u5f15\u65f6&#xff0c;\u53ef\u624b\u52a8\u6307\u5b9a\u8fb9\u754c\u52a0\u901f<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u9700\u8981\u9650\u5b9a\u5206\u7247\u8303\u56f4<\/td>\n<td align=\"left\">\u53ea\u5bfc\u5165\u7279\u5b9a\u533a\u95f4\u7684\u6570\u636e<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u5206\u7247\u5217\u6709NULL\u503c<\/td>\n<td align=\"left\">\u907f\u514d\u56e0NULL\u5bfc\u81f4\u5206\u7247\u5931\u8d25<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>6.3 \u547d\u4ee4\u793a\u4f8b<\/h4>\n<p><span class=\"token comment\"># \u624b\u52a8\u6307\u5b9a\u5206\u7247\u8303\u56f4&#xff08;\u4ece1000\u523050000000&#xff09;<\/span><br \/>\nsqoop <span class=\"token function\">import<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token parameter variable\">&#8211;table<\/span> orders <span class=\"token punctuation\">\\\\<\/span><br \/>\n  &#8211;split-by <span class=\"token function\">id<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n  &#8211;boundary-query <span class=\"token string\">&#034;SELECT 1000, 50000000 FROM dual&#034;<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token parameter variable\">-m<\/span> <span class=\"token number\">8<\/span><\/p>\n<h3>7. \u4f18\u5316\u7b56\u7565\u4e09&#xff1a;\u52a8\u6001\u751f\u6210\u865a\u62df\u5206\u7247\u5217&#xff08;\u7ec8\u6781\u65b9\u6848&#xff09;<\/h3>\n<p>\u5f53\u8868\u4e2d\u6ca1\u6709\u4efb\u4f55\u5408\u9002\u7684\u5217\u53ef\u4f5c\u4e3a\u5206\u7247\u4f9d\u636e\u65f6&#xff0c;\u53ef\u4ee5\u91c7\u7528\u52a8\u6001\u751f\u6210\u865a\u62df\u5206\u7247\u5217\u7684\u65b9\u6848\u3002<\/p>\n<h4>7.1 \u6838\u5fc3\u601d\u60f3<\/h4>\n<p>\u5728\u67e5\u8be2\u4e2d\u4f7f\u7528ROW_NUMBER()\u7a97\u53e3\u51fd\u6570\u4e3a\u6bcf\u4e00\u884c\u751f\u6210\u4e00\u4e2a\u8fde\u7eed\u3001\u5747\u5300\u7684\u5e8f\u53f7&#xff0c;\u7136\u540e\u4ee5\u8fd9\u4e2a\u5e8f\u53f7\u4f5c\u4e3a\u5206\u7247\u5217\u3002<\/p>\n<p>  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.flowchartTitleText{text-anchor:middle;font-size:18px;fill:#333;}#mermaid-svg-KjMwIiADpnWiPT94 rect.text{fill:none;stroke-width:0;}#mermaid-svg-KjMwIiADpnWiPT94 .icon-shape,#mermaid-svg-KjMwIiADpnWiPT94 .image-shape{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-KjMwIiADpnWiPT94 .icon-shape p,#mermaid-svg-KjMwIiADpnWiPT94 .image-shape p{background-color:rgba(232,232,232, 0.8);padding:2px;}#mermaid-svg-KjMwIiADpnWiPT94 .icon-shape .label rect,#mermaid-svg-KjMwIiADpnWiPT94 .image-shape .label rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-KjMwIiADpnWiPT94 .label-icon{display:inline-block;height:1em;overflow:visible;vertical-align:-0.125em;}#mermaid-svg-KjMwIiADpnWiPT94 .node .label-icon path{fill:currentColor;stroke:revert;stroke-width:revert;}#mermaid-svg-KjMwIiADpnWiPT94 :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\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>\u539f\u59cb\u6570\u636e<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>\u6dfb\u52a0ROW_NUMBER\u751f\u6210\u865a\u62dfID<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>\u4ee5\u865a\u62dfID\u4f5c\u4e3asplit-by<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>\u5747\u5300\u5206\u7247<\/p>\n<p><\/span><\/p>\n<h4>7.2 \u547d\u4ee4\u793a\u4f8b<\/h4>\n<p>sqoop <span class=\"token function\">import<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token parameter variable\">&#8211;connect<\/span> jdbc:mysql:\/\/dbserver:3306\/business <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token parameter variable\">&#8211;username<\/span> reader <span class=\"token punctuation\">\\\\<\/span><br \/>\n  &#8211;password-file \/user\/safe\/mysql.pwd <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token parameter variable\">&#8211;query<\/span> <span class=\"token string\">&#034;SELECT t.*, ROW_NUMBER() OVER() as split_col FROM orders t WHERE \\\\<span class=\"token variable\">$CONDITIONS<\/span>&#034;<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n  &#8211;split-by split_col <span class=\"token punctuation\">\\\\<\/span><br \/>\n  &#8211;boundary-query <span class=\"token string\">&#034;SELECT 1, (SELECT COUNT(*) FROM orders) FROM dual&#034;<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token parameter variable\">-m<\/span> <span class=\"token number\">8<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n  &#8211;target-dir \/data\/orders<\/p>\n<h4>7.3 \u539f\u7406\u8bf4\u660e<\/h4>\n<li>\u751f\u6210\u865a\u62df\u5217&#xff1a;ROW_NUMBER() OVER()\u4e3a\u6bcf\u6761\u8bb0\u5f55\u751f\u6210\u4e00\u4e2a\u4ece1\u5f00\u59cb\u9012\u589e\u7684\u5e8f\u53f7<\/li>\n<li>\u4f5c\u4e3a\u5206\u7247\u5217&#xff1a;&#8211;split-by split_col\u4ee5\u8fd9\u4e2a\u5e8f\u53f7\u4f5c\u4e3a\u5206\u7247\u4f9d\u636e<\/li>\n<li>\u624b\u52a8\u6307\u5b9a\u8fb9\u754c&#xff1a;&#8211;boundary-query\u544a\u8bc9Sqoop\u6700\u5c0f\u503c\u662f1&#xff0c;\u6700\u5927\u503c\u662f\u603b\u884c\u6570<\/li>\n<p>\u6548\u679c&#xff1a;\u7531\u4e8e\u5e8f\u53f7\u662f\u8fde\u7eed\u4e14\u5747\u5300\u7684&#xff0c;\u65e0\u8bba\u539f\u59cb\u6570\u636e\u5206\u5e03\u5982\u4f55&#xff0c;\u5206\u7247\u90fd\u4f1a\u88ab\u5747\u5300\u5206\u914d\u5230\u5404\u4e2aMap\u4efb\u52a1\u3002<\/p>\n<h3>8. \u5206\u7247\u4f18\u5316\u5b9e\u6218\u811a\u672c<\/h3>\n<h4>8.1 \u666e\u901a\u573a\u666f\u4f18\u5316\u811a\u672c<\/h4>\n<p><span class=\"token shebang important\">#!\/bin\/bash<\/span><br \/>\n<span class=\"token comment\"># optimized_import.sh<\/span><br \/>\n<span class=\"token comment\"># \u4f7f\u7528\u5408\u9002\u7684\u5206\u7247\u5217\u4f18\u5316\u5bfc\u5165<\/span><\/p>\n<p><span class=\"token assign-left variable\">TABLE<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token variable\">$1<\/span><br \/>\n<span class=\"token assign-left variable\">DATE_STR<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token variable\"><span class=\"token variable\">$(<\/span><span class=\"token function\">date<\/span> &#043;%Y%m%d<span class=\"token variable\">)<\/span><\/span><\/p>\n<p><span class=\"token comment\"># \u52a8\u6001\u5224\u65ad\u6700\u4f73\u5206\u7247\u5217<\/span><br \/>\n<span class=\"token comment\"># \u5047\u8bbe\u8868\u6709id&#xff08;\u81ea\u589e\u4e3b\u952e&#xff09;\u548cstatus&#xff08;\u72b6\u6001\u7801&#xff09;\u4e24\u5217<\/span><\/p>\n<p>sqoop <span class=\"token function\">import<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token parameter variable\">&#8211;connect<\/span> jdbc:mysql:\/\/dbserver:3306\/business <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token parameter variable\">&#8211;username<\/span> reader <span class=\"token punctuation\">\\\\<\/span><br \/>\n  &#8211;password-file \/user\/safe\/mysql.pwd <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token parameter variable\">&#8211;table<\/span> <span class=\"token variable\">${TABLE}<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n  &#8211;target-dir \/data\/<span class=\"token variable\">${TABLE}<\/span>\/dt<span class=\"token operator\">&#061;<\/span><span class=\"token variable\">${DATE_STR}<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n  &#8211;delete-target-dir <span class=\"token punctuation\">\\\\<\/span><br \/>\n  &#8211;split-by <span class=\"token function\">id<\/span> <span class=\"token punctuation\">\\\\<\/span>                    <span class=\"token comment\"># \u4f7f\u7528\u81ea\u589e\u4e3b\u952e<\/span><br \/>\n  &#8211;num-mappers <span class=\"token number\">8<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n  &#8211;fetch-size <span class=\"token number\">5000<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token parameter variable\">&#8211;compress<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n  &#8211;compression-codec snappy<\/p>\n<h4>8.2 \u6570\u636e\u503e\u659c\u573a\u666f\u89e3\u51b3\u65b9\u6848<\/h4>\n<p><span class=\"token shebang important\">#!\/bin\/bash<\/span><br \/>\n<span class=\"token comment\"># fix_skew_import.sh<\/span><br \/>\n<span class=\"token comment\"># \u89e3\u51b3\u6570\u636e\u503e\u659c\u95ee\u9898&#xff1a;\u4f7f\u7528\u865a\u62df\u5217\u5747\u5300\u5206\u7247<\/span><\/p>\n<p><span class=\"token assign-left variable\">TABLE<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;user_logs&#034;<\/span><br \/>\n<span class=\"token assign-left variable\">CONDITION<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;log_date &gt;&#061; &#039;2024-01-01&#039; AND log_date &lt; &#039;2024-02-01&#039;&#034;<\/span><\/p>\n<p><span class=\"token comment\"># \u83b7\u53d6\u603b\u884c\u6570<\/span><br \/>\n<span class=\"token assign-left variable\">TOTAL_ROWS<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token variable\"><span class=\"token variable\">$(<\/span>mysql <span class=\"token parameter variable\">-h<\/span> dbserver <span class=\"token parameter variable\">-e<\/span> <span class=\"token string\">&#034;SELECT COUNT(*) FROM <span class=\"token variable\">${TABLE}<\/span> WHERE <span class=\"token variable\">${CONDITION}<\/span>&#034;<\/span> <span class=\"token parameter variable\">-s<\/span> <span class=\"token parameter variable\">-N<\/span><span class=\"token variable\">)<\/span><\/span><\/p>\n<p>sqoop <span class=\"token function\">import<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token parameter variable\">&#8211;connect<\/span> jdbc:mysql:\/\/dbserver:3306\/business <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token parameter variable\">&#8211;username<\/span> reader <span class=\"token punctuation\">\\\\<\/span><br \/>\n  &#8211;password-file \/user\/safe\/mysql.pwd <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token parameter variable\">&#8211;query<\/span> <span class=\"token string\">&#034;SELECT t.*, ROW_NUMBER() OVER() as split_key FROM <span class=\"token variable\">${TABLE}<\/span> t WHERE <span class=\"token variable\">${CONDITION}<\/span> AND \\\\<span class=\"token variable\">$CONDITIONS<\/span>&#034;<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n  &#8211;split-by split_key <span class=\"token punctuation\">\\\\<\/span><br \/>\n  &#8211;boundary-query <span class=\"token string\">&#034;SELECT 1, <span class=\"token variable\">${TOTAL_ROWS}<\/span> FROM dual&#034;<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n  &#8211;target-dir \/data\/<span class=\"token variable\">${TABLE}<\/span>\/202401 <span class=\"token punctuation\">\\\\<\/span><br \/>\n  &#8211;delete-target-dir <span class=\"token punctuation\">\\\\<\/span><br \/>\n  &#8211;num-mappers <span class=\"token number\">8<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n  &#8211;fetch-size <span class=\"token number\">5000<\/span><\/p>\n<h3>9. \u5e38\u89c1\u95ee\u9898\u4e0e\u6392\u67e5<\/h3>\n<h4>9.1 \u95ee\u9898&#xff1a;\u5206\u7247\u5217\u5305\u542bNULL\u503c<\/h4>\n<p>\u73b0\u8c61&#xff1a;\u4f5c\u4e1a\u5931\u8d25&#xff0c;\u63d0\u793aNULL\u503c\u5bfc\u81f4\u5206\u7247\u8ba1\u7b97\u5f02\u5e38\u3002<\/p>\n<p>\u539f\u56e0&#xff1a;MIN()\u6216MAX()\u67e5\u8be2\u8fd4\u56deNULL&#xff0c;\u5bfc\u81f4\u5206\u7247\u8ba1\u7b97\u5931\u8d25\u3002<\/p>\n<p>\u89e3\u51b3\u65b9\u6848&#xff1a;<\/p>\n<p><span class=\"token comment\"># \u65b9\u68481&#xff1a;\u5728\u67e5\u8be2\u4e2d\u8fc7\u6ee4NULL<\/span><br \/>\n<span class=\"token parameter variable\">&#8211;query<\/span> <span class=\"token string\">&#034;SELECT * FROM table WHERE split_col IS NOT NULL AND \\\\<span class=\"token variable\">$CONDITIONS<\/span>&#034;<\/span><\/p>\n<p><span class=\"token comment\"># \u65b9\u68482&#xff1a;\u4f7f\u7528boundary-query\u624b\u52a8\u6307\u5b9a<\/span><br \/>\n&#8211;boundary-query <span class=\"token string\">&#034;SELECT 1, 1000000 FROM dual&#034;<\/span><\/p>\n<h4>9.2 \u95ee\u9898&#xff1a;\u5206\u7247\u540e\u6570\u636e\u4e0d\u5747\u5300<\/h4>\n<p>\u73b0\u8c61&#xff1a;\u5404Map\u4efb\u52a1\u5904\u7406\u7684\u6570\u636e\u91cf\u76f8\u5dee\u5f88\u5927\u3002<\/p>\n<p>\u89e3\u51b3\u65b9\u6848&#xff1a;<\/p>\n<li>\u68c0\u67e5\u5206\u7247\u5217\u662f\u5426\u5206\u5e03\u5747\u5300<\/li>\n<li>\u8003\u8651\u4f7f\u7528\u865a\u62df\u5217\u65b9\u6848<\/li>\n<li>\u9002\u5f53\u589e\u52a0-m\u6570\u91cf<\/li>\n<h4>9.3 \u95ee\u9898&#xff1a;MIN\/MAX\u67e5\u8be2\u592a\u6162<\/h4>\n<p>\u73b0\u8c61&#xff1a;\u4f5c\u4e1a\u5361\u5728&#034;Retrieving max and min values&#034;\u9636\u6bb5\u3002<\/p>\n<p>\u89e3\u51b3\u65b9\u6848&#xff1a;<\/p>\n<p><span class=\"token comment\"># \u4f7f\u7528boundary-query\u624b\u52a8\u6307\u5b9a\u8fb9\u754c<\/span><br \/>\n&#8211;boundary-query <span class=\"token string\">&#034;SELECT 1, (SELECT MAX(id) FROM table) FROM dual&#034;<\/span><\/p>\n<h3>10. \u603b\u7ed3<\/h3>\n<h4>10.1 \u6838\u5fc3\u8981\u70b9\u56de\u987e<\/h4>\n<table>\n<tr>\u7b56\u7565\u9002\u7528\u573a\u666f\u5173\u952e\u53c2\u6570\u6548\u679c<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">\u9009\u62e9\u7406\u60f3\u5206\u7247\u5217<\/td>\n<td align=\"left\">\u8868\u4e2d\u6709\u9ad8\u57fa\u6570\u3001\u5206\u5e03\u5747\u5300\u7684\u5217<\/td>\n<td align=\"left\">&#8211;split-by<\/td>\n<td align=\"left\">\u57fa\u7840\u4f18\u5316&#xff0c;\u6700\u7b80\u5355<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u81ea\u5b9a\u4e49\u8fb9\u754c<\/td>\n<td align=\"left\">MIN\/MAX\u67e5\u8be2\u6162\u3001\u9700\u8981\u9650\u5b9a\u8303\u56f4<\/td>\n<td align=\"left\">&#8211;boundary-query<\/td>\n<td align=\"left\">\u63d0\u5347\u542f\u52a8\u901f\u5ea6<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u865a\u62df\u5206\u7247\u5217<\/td>\n<td align=\"left\">\u65e0\u5408\u9002\u5206\u7247\u5217\u3001\u6570\u636e\u4e25\u91cd\u503e\u659c<\/td>\n<td align=\"left\">ROW_NUMBER() &#043; split-by<\/td>\n<td align=\"left\">\u89e3\u51b3\u503e\u659c\u7ec8\u6781\u65b9\u6848<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>10.2 \u5206\u7247\u5217\u9009\u62e9\u4f18\u5148\u7ea7<\/h4>\n<li>\u9996\u9009&#xff1a;\u81ea\u589e\u4e3b\u952e&#xff08;INT\u7c7b\u578b&#xff0c;\u5206\u5e03\u5747\u5300&#xff09;<\/li>\n<li>\u6b21\u9009&#xff1a;\u65f6\u95f4\u6233\u5217&#xff08;DATE\/TIMESTAMP&#xff0c;\u901a\u5e38\u8f83\u5747\u5300&#xff09;<\/li>\n<li>\u5907\u9009&#xff1a;\u4e1a\u52a1\u6570\u503c\u5217&#xff08;\u9700\u68c0\u67e5\u5206\u5e03&#xff09;<\/li>\n<li>\u7279\u6b8a\u5904\u7406&#xff1a;\u65e0\u5408\u9002\u5217\u65f6&#xff0c;\u4f7f\u7528\u865a\u62df\u5217\u65b9\u6848<\/li>\n<h4>10.3 \u6700\u7ec8\u5efa\u8bae<\/h4>\n<li>\u7406\u89e3\u4f60\u7684\u6570\u636e&#xff1a;\u5728\u8bbe\u7f6e&#8211;split-by\u4e4b\u524d&#xff0c;\u5148\u5206\u6790\u5206\u7247\u5217\u7684\u5206\u5e03\u60c5\u51b5<\/li>\n<li>\u76d1\u63a7\u4efb\u52a1\u8fd0\u884c&#xff1a;\u901a\u8fc7YARN UI\u89c2\u5bdf\u5404Map\u4efb\u52a1\u7684\u5904\u7406\u91cf\u662f\u5426\u5747\u5300<\/li>\n<li>\u503e\u659c\u5fc5\u89e3\u51b3&#xff1a;\u9047\u5230\u6570\u636e\u503e\u659c&#xff0c;\u4f18\u5148\u8003\u8651\u865a\u62df\u5217\u65b9\u6848<\/li>\n<li>\u6d4b\u8bd5\u5148\u884c&#xff1a;\u5148\u7528&#8211;where &#034;1&#061;1 limit 10000&#034;\u6d4b\u8bd5\u5206\u7247\u6548\u679c<\/li>\n<p>\u638c\u63e1\u8fd9\u4e9b\u5206\u7247\u4f18\u5316\u6280\u5de7&#xff0c;\u4f60\u7684Sqoop\u5bfc\u5165\u4efb\u52a1\u5c06\u5b9e\u73b0\u771f\u6b63\u7684\u5747\u5300\u5e76\u884c&#xff0c;\u544a\u522b&#034;\u4e00\u62d6N&#034;\u7684\u4f4e\u6548\u6a21\u5f0f\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260829054105-6a9270f181616.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<table width=\"100%\">\n<tbody>\n<tr>\n<td width=\"50%\">\n<p>     <font face=\"STCAIYUN\" color=\"red\" size=\"4\">&#x1f33a;The 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