{"id":40528,"date":"2025-05-29T09:38:10","date_gmt":"2025-05-29T01:38:10","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/40528.html"},"modified":"2025-05-29T09:38:10","modified_gmt":"2025-05-29T01:38:10","slug":"%e3%80%90redis%e5%8e%9f%e7%90%86%e7%af%87%e3%80%91%e5%ba%95%e5%b1%82%e6%95%b0%e6%8d%ae%e7%bb%93%e6%9e%84","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/40528.html","title":{"rendered":"\u3010redis\u539f\u7406\u7bc7\u3011\u5e95\u5c42\u6570\u636e\u7ed3\u6784"},"content":{"rendered":"

SDS<\/h3>\n

Redis\u662f\u57fa\u4e8eC\u8bed\u8a00\u5b9e\u73b0\u7684，\u4f46\u662fRedis\u4e2d\u5927\u91cf\u4f7f\u7528\u7684\u5b57\u7b26\u4e32\u5e76\u6ca1\u6709\u76f4\u63a5\u4f7f\u7528C\u8bed\u8a00\u5b57\u7b26\u4e32\u3002<\/p>\n

\u4e00\u3001SDS \u7684\u8bbe\u8ba1\u52a8\u673a<\/h4>\n

\u4f20\u7edf C \u5b57\u7b26\u4e32\u4ee5 \\\\0 \u7ed3\u5c3e，\u5b58\u5728\u4ee5\u4e0b\u95ee\u9898：<\/p>\n

  • \u6027\u80fd\u74f6\u9888：\u83b7\u53d6\u957f\u5ea6\u9700\u904d\u5386\u5b57\u7b26\u6570\u7ec4，\u65f6\u95f4\u590d\u6742\u5ea6 O(n)\u3002<\/li>\n
  • \u7f13\u51b2\u533a\u6ea2\u51fa：\u62fc\u63a5\u64cd\u4f5c\u53ef\u80fd\u8986\u76d6\u76f8\u90bb\u5185\u5b58\u3002<\/li>\n
  • \u4e8c\u8fdb\u5236\u4e0d\u5b89\u5168：\u65e0\u6cd5\u5b58\u50a8\u542b \\\\0 \u7684\u6570\u636e（\u5982\u56fe\u7247\u3001\u97f3\u9891）\u3002<\/li>\n
  • \u5185\u5b58\u91cd\u5206\u914d\u9891\u7e41：\u6bcf\u6b21\u4fee\u6539\u53ef\u80fd\u89e6\u53d1 realloc，\u5f71\u54cd\u6027\u80fd\u3002<\/li>\n

    SDS \u901a\u8fc7 \u7ed3\u6784\u4f53\u5c01\u88c5\u5143\u6570\u636e \u548c \u5185\u5b58\u9884\u5206\u914d\u7b56\u7565 \u89e3\u51b3\u8fd9\u4e9b\u95ee\u9898\u3002<\/p>\n

    \u4e8c\u3001SDS \u7684\u7ed3\u6784\u8bbe\u8ba1<\/h4>\n

    SDS \u7684\u5e95\u5c42\u7ed3\u6784\u7531 Header（\u5143\u6570\u636e） \u548c \u5b57\u7b26\u6570\u7ec4（\u5b9e\u9645\u6570\u636e） \u7ec4\u6210\u3002\u4ee5 Redis 5.0 \u4e3a\u4f8b，\u5176\u7ed3\u6784\u5b9a\u4e49\u5982\u4e0b：<\/p>\n

    struct<\/span> sdshdr<\/span> {<\/span>
    \n uint8_t<\/span> len;<\/span> \/\/ \u5df2\u4f7f\u7528\u7684\u5b57\u8282\u6570（\u5b57\u7b26\u4e32\u771f\u5b9e\u957f\u5ea6）<\/span>
    \n uint8_t<\/span> alloc;<\/span> \/\/ \u5206\u914d\u7684\u603b\u5b57\u8282\u6570（\u4e0d\u542b Header）<\/span>
    \n unsigned<\/span> char<\/span> flags;<\/span> \/\/ SDS \u7c7b\u578b\u6807\u8bb0（\u5982 sdshdr5\u3001sdshdr8）<\/span>
    \n char<\/span> buf[<\/span>]<\/span>;<\/span> \/\/ \u67d4\u6027\u6570\u7ec4，\u5b58\u50a8\u5b9e\u9645\u5b57\u7b26（\u4ee5 '\\\\0' \u7ed3\u5c3e）<\/span>
    \n}<\/span>;<\/span><\/p>\n

    \u5185\u5b58\u5e03\u5c40<\/h5>\n

    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

    \u4e09\u3001SDS \u7684\u6838\u5fc3\u539f\u7406<\/h4>\n

    1. O(1) \u65f6\u95f4\u590d\u6742\u5ea6\u83b7\u53d6\u957f\u5ea6<\/h5>\n
      \n
    • \u4f20\u7edf C \u5b57\u7b26\u4e32：\u9700\u904d\u5386\u76f4\u5230 \\\\0，\u65f6\u95f4\u590d\u6742\u5ea6 O(n)\u3002<\/li>\n
    • SDS：\u76f4\u63a5\u8bfb\u53d6 len \u5c5e\u6027，\u65f6\u95f4\u590d\u6742\u5ea6 O(1)\u3002<\/li>\n<\/ul>\n
      2. \u675c\u7edd\u7f13\u51b2\u533a\u6ea2\u51fa<\/h5>\n
        \n
      • \u81ea\u52a8\u6269\u5bb9\u68c0\u67e5：\u4fee\u6539\u5b57\u7b26\u4e32\u524d，\u68c0\u67e5 alloc – len \u7684\u5269\u4f59\u7a7a\u95f4\u3002\n
          \n
        • \u7a7a\u95f4\u4e0d\u8db3\u65f6：\u89e6\u53d1\u6269\u5bb9\u673a\u5236，\u6269\u5c55\u81f3 \u65b0\u957f\u5ea6 * 2（\u5c0f\u4e8e 1MB）\u6216 \u65b0\u957f\u5ea6 <\/li>\n
        • + 1MB（\u5927\u4e8e 1MB）\u3002<\/li>\n<\/ul>\n<\/li>\n
        • \u793a\u4f8b： \u539f\u5b57\u7b26\u4e32\u957f\u5ea6 5MB，\u8ffd\u52a0 2MB \u6570\u636e，\u65b0\u5206\u914d\u7a7a\u95f4\u4e3a 5MB + 2MB + 1MB = 8MB\u3002<\/li>\n<\/ul>\n
          3. \u4e8c\u8fdb\u5236\u5b89\u5168<\/h5>\n
            \n
          • \u4e0d\u4f9d\u8d56 \\\\0 \u7ec8\u6b62\u7b26：\u901a\u8fc7 len \u8bb0\u5f55\u771f\u5b9e\u957f\u5ea6，\u5141\u8bb8\u5b58\u50a8\u4efb\u610f\u4e8c\u8fdb\u5236\u6570\u636e（\u5305\u62ec \\\\0）\u3002<\/li>\n
          • \u793a\u4f8b： \u5b58\u50a8 JPEG \u56fe\u7247\u6570\u636e\u65f6，\u5373\u4f7f\u5185\u5bb9\u542b\u591a\u4e2a \\\\0，SDS \u4e5f\u80fd\u5b8c\u6574\u4fdd\u5b58\u3002<\/li>\n<\/ul>\n
            4. \u5185\u5b58\u4f18\u5316\u7b56\u7565<\/h5>\n
              \n
            • \u9884\u5206\u914d（Pre-allocation）： \u6269\u5bb9\u65f6\u9884\u7559\u989d\u5916\u7a7a\u95f4，\u51cf\u5c11\u540e\u7eed\u4fee\u6539\u65f6\u7684\u5185\u5b58\u5206\u914d\u6b21\u6570\u3002<\/li>\n
            • \u60f0\u6027\u91ca\u653e（Lazy Free）： \u7f29\u77ed\u5b57\u7b26\u4e32\u65f6\u4e0d\u7acb\u5373\u91ca\u653e\u5185\u5b58，\u4ec5\u51cf\u5c11 len，\u4fdd\u7559 alloc \u4f9b\u540e\u7eed\u4f7f\u7528\u3002<\/li>\n<\/ul>\n

              Intset<\/h3>\n

              Redis \u7684 intset（\u6574\u6570\u96c6\u5408） \u662f\u4e00\u79cd\u9ad8\u6548\u7684\u6709\u5e8f\u6574\u6570\u5b58\u50a8\u7ed3\u6784，\u4e13\u95e8\u7528\u4e8e\u4f18\u5316\u5c0f\u89c4\u6a21\u6574\u6570\u96c6\u5408\u7684\u5185\u5b58\u5360\u7528\u548c\u67e5\u8be2\u6027\u80fd\u3002<\/p>\n

              \u4e00\u3001intset \u7684\u7ed3\u6784\u8bbe\u8ba1<\/h4>\n

              1. \u5185\u5b58\u5e03\u5c40<\/h5>\n

              intset \u7531\u4e09\u90e8\u5206\u7ec4\u6210：<\/p>\n

              typedef<\/span> struct<\/span> intset<\/span> {<\/span>
              \n uint32_t<\/span> encoding;<\/span> \/\/ \u7f16\u7801\u65b9\u5f0f（\u51b3\u5b9a\u6bcf\u4e2a\u6574\u6570\u5360\u7528\u7684\u5b57\u8282\u6570）<\/span>
              \n uint32_t<\/span> length;<\/span> \/\/ \u5143\u7d20\u6570\u91cf<\/span>
              \n int8_t<\/span> contents[<\/span>]<\/span>;<\/span> \/\/ \u67d4\u6027\u6570\u7ec4，\u5b9e\u9645\u5b58\u50a8\u6574\u6570<\/span>
              \n}<\/span> intset;<\/span><\/p>\n

                \n
              • encoding：\u7f16\u7801\u7c7b\u578b，\u53ef\u9009\u503c：\n
                  \n
                • INTSET_ENC_INT16（2 \u5b57\u8282，\u8303\u56f4 -32768~32767）<\/li>\n
                • INTSET_ENC_INT32（4 \u5b57\u8282，\u8303\u56f4 -231~2<\/sup>31-1）<\/li>\n
                • INTSET_ENC_INT64（8 \u5b57\u8282，\u8303\u56f4 -263~2<\/sup>63-1）<\/li>\n<\/ul>\n<\/li>\n
                • contents：\u5143\u7d20\u6309\u5347\u5e8f\u6392\u5217，\u4fbf\u4e8e\u4e8c\u5206\u67e5\u627e\u3002<\/li>\n<\/ul>\n

                  \u4e8c\u3001intset \u7684\u6838\u5fc3\u7279\u6027<\/h4>\n

                  1. \u52a8\u6001\u7f16\u7801\u5347\u7ea7<\/h5>\n
                    \n
                  • \u89e6\u53d1\u6761\u4ef6：\u63d2\u5165\u7684\u6574\u6570\u8d85\u51fa\u5f53\u524d\u7f16\u7801\u8303\u56f4\u65f6，\u81ea\u52a8\u5347\u7ea7\u7f16\u7801（\u5982\u4ece INT16 \u5347\u7ea7\u5230 INT32）\u3002<\/li>\n
                  • \u5347\u7ea7\u8fc7\u7a0b：\n
                  • \u8ba1\u7b97\u65b0\u7f16\u7801\u6240\u9700\u7a7a\u95f4\u3002<\/li>\n
                  • \u6309\u65b0\u7f16\u7801\u91cd\u65b0\u5206\u914d\u5185\u5b58，\u5e76\u5c06\u65e7\u6570\u636e\u8f6c\u6362\u4e3a\u65b0\u683c\u5f0f\u3002<\/li>\n
                  • \u63d2\u5165\u65b0\u5143\u7d20\u5e76\u4fdd\u6301\u6709\u5e8f\u3002<\/li>\n<\/li>\n
                  • \u793a\u4f8b： \u539f\u7f16\u7801\u4e3a INT16，\u63d2\u5165 40000（\u8d85\u51fa INT16 \u8303\u56f4） \u2192 \u5347\u7ea7\u4e3a INT32\u3002<\/li>\n<\/ul>\n
                    2. \u6709\u5e8f\u5b58\u50a8<\/h5>\n
                      \n
                    • \u5143\u7d20\u6392\u5e8f：\u6240\u6709\u6574\u6570\u6309\u5347\u5e8f\u6392\u5217，\u652f\u6301 O(log n) \u65f6\u95f4\u590d\u6742\u5ea6\u7684\u4e8c\u5206\u67e5\u627e\u3002<\/li>\n
                    • \u63d2\u5165\u590d\u6742\u5ea6：\n
                        \n
                      • \u67e5\u627e\u4f4d\u7f6e O(log n) + \u79fb\u52a8\u5143\u7d20 O(n)（\u9700\u4fdd\u6301\u6709\u5e8f\u6027）\u3002<\/li>\n
                      • \u7f16\u7801\u5347\u7ea7\u65f6\u8fd8\u9700 O(n) \u65f6\u95f4\u8f6c\u6362\u6570\u636e\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
                        3.\u6848\u4f8b\u5206\u6790<\/h5>\n

                        \u6570\u7ec4\u4e2d\u5148\u63d2\u51655,10,20<\/p>\n

                        \u4e3a\u4e86\u65b9\u4fbf\u67e5\u627e，Redis\u4f1a\u5c06intset\u4e2d\u6240\u6709\u7684\u6574\u6570\u6309\u7167\u5347\u5e8f\u4f9d\u6b21\u4fdd\u5b58\u5728contents\u6570\u7ec4\u4e2d，\u7ed3\u6784\u5982\u56fe： \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

                        \u73b0\u5728，\u6570\u7ec4\u4e2d\u6bcf\u4e2a\u6570\u5b57\u90fd\u5728int16_t\u7684\u8303\u56f4\u5185，\u56e0\u6b64\u91c7\u7528\u7684\u7f16\u7801\u65b9\u5f0f\u662fINTSET_ENC_INT16，\u6bcf\u90e8\u5206\u5360\u7528\u7684\u5b57\u8282\u5927\u5c0f\u4e3a： encoding：4\u5b57\u8282 length：4\u5b57\u8282 contents：2\u5b57\u8282 * 3 = 6\u5b57\u8282 \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

                        \u6211\u4eec\u5411\u8be5\u5176\u4e2d\u6dfb\u52a0\u4e00\u4e2a\u6570\u5b57：50000，\u8fd9\u4e2a\u6570\u5b57\u8d85\u51fa\u4e86int16_t\u7684\u8303\u56f4，intset\u4f1a\u81ea\u52a8\u5347\u7ea7\u7f16\u7801\u65b9\u5f0f\u5230\u5408\u9002\u7684\u5927\u5c0f\u3002 \u4ee5\u5f53\u524d\u6848\u4f8b\u6765\u8bf4\u6d41\u7a0b\u5982\u4e0b：<\/p>\n

                          \n
                        • \u5347\u7ea7\u7f16\u7801\u4e3aINTSET_ENC_INT32, \u6bcf\u4e2a\u6574\u6570\u53604\u5b57\u8282，\u5e76\u6309\u7167\u65b0\u7684\u7f16\u7801\u65b9\u5f0f\u53ca\u5143\u7d20\u4e2a\u6570\u6269\u5bb9\u6570\u7ec4<\/li>\n
                        • \u5012\u5e8f\u4f9d\u6b21\u5c06\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u62f7\u8d1d\u5230\u6269\u5bb9\u540e\u7684\u6b63\u786e\u4f4d\u7f6e（\u9632\u6b62\u8986\u76d6\u540e\u7eed\u5143\u7d20）<\/li>\n
                        • \u5c06\u5f85\u6dfb\u52a0\u7684\u5143\u7d20\u653e\u5165\u6570\u7ec4\u672b\u5c3e<\/li>\n
                        • \u6700\u540e，\u5c06inset\u7684encoding\u5c5e\u6027\u6539\u4e3aINTSET_ENC_INT32，\u5c06length\u5c5e\u6027\u6539\u4e3a4<\/li>\n<\/ul>\n

                          \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

                          4.\u63d2\u5165\u5143\u7d20\u4ee5\u53ca\u6269\u5bb9\u6e90\u7801<\/h5>\n

                          \/* Upgrades the intset to a larger encoding and inserts the given integer. *\/<\/span>
                          \nstatic<\/span> intset *<\/span>intsetUpgradeAndAdd<\/span>(<\/span>intset *<\/span>is,<\/span> int64_t<\/span> value)<\/span> {<\/span>
                          \n uint8_t<\/span> curenc =<\/span> intrev32ifbe<\/span>(<\/span>is-><\/span>encoding)<\/span>;<\/span>
                          \n uint8_t<\/span> newenc =<\/span> _intsetValueEncoding<\/span>(<\/span>value)<\/span>;<\/span>
                          \n int<\/span> length =<\/span> intrev32ifbe<\/span>(<\/span>is-><\/span>length)<\/span>;<\/span>
                          \n int<\/span> prepend =<\/span> value <<\/span> 0<\/span> ?<\/span> 1<\/span> :<\/span> 0<\/span>;<\/span><\/p>\n

                          \/* First set new encoding and resize *\/<\/span>
                          \n is-><\/span>encoding =<\/span> intrev32ifbe<\/span>(<\/span>newenc)<\/span>;<\/span>
                          \n is =<\/span> intsetResize<\/span>(<\/span>is,<\/span>intrev32ifbe<\/span>(<\/span>is-><\/span>length)<\/span>+<\/span>1<\/span>)<\/span>;<\/span><\/p>\n

                          \/* Upgrade back-to-front so we don't overwrite values.
                          \n * Note that the "prepend" variable is used to make sure we have an empty
                          \n * space at either the beginning or the end of the intset. *\/<\/span>
                          \n while<\/span>(<\/span>length—<\/span>)<\/span>
                          \n _intsetSet<\/span>(<\/span>is,<\/span>length+<\/span>prepend,<\/span>_intsetGetEncoded<\/span>(<\/span>is,<\/span>length,<\/span>curenc)<\/span>)<\/span>;<\/span><\/p>\n

                          \/* Set the value at the beginning or the end. *\/<\/span>
                          \n if<\/span> (<\/span>prepend)<\/span>
                          \n _intsetSet<\/span>(<\/span>is,<\/span>0<\/span>,<\/span>value)<\/span>;<\/span>
                          \n else<\/span>
                          \n _intsetSet<\/span>(<\/span>is,<\/span>intrev32ifbe<\/span>(<\/span>is-><\/span>length)<\/span>,<\/span>value)<\/span>;<\/span>
                          \n is-><\/span>length =<\/span> intrev32ifbe<\/span>(<\/span>intrev32ifbe<\/span>(<\/span>is-><\/span>length)<\/span>+<\/span>1<\/span>)<\/span>;<\/span>
                          \n return<\/span> is;<\/span>
                          \n}<\/span><\/p>\n

                          Dict<\/h3>\n

                          Redis \u4e2d\u7684 dict（\u5b57\u5178） \u662f\u6838\u5fc3\u6570\u636e\u7ed3\u6784\u4e4b\u4e00，\u7528\u4e8e\u5b9e\u73b0\u952e\u503c\u5b58\u50a8（Key-Value）\u3001\u54c8\u5e0c\u7c7b\u578b（Hash）\u53ca\u6570\u636e\u5e93\u952e\u7a7a\u95f4（Keyspace）\u7b49\u6838\u5fc3\u529f\u80fd\u3002<\/p>\n

                          \u4e00\u3001dict \u7684\u7ed3\u6784\u8bbe\u8ba1<\/h4>\n

                          1. \u6838\u5fc3\u7ed3\u6784\u4f53\u5b9a\u4e49<\/h5>\n

                          \u6211\u4eec\u77e5\u9053Redis\u662f\u4e00\u4e2a\u952e\u503c\u578b（Key-Value Pair）\u7684\u6570\u636e\u5e93，\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u952e\u5b9e\u73b0\u5feb\u901f\u7684\u589e\u5220\u6539\u67e5\u3002\u800c\u952e\u4e0e\u503c\u7684\u6620\u5c04\u5173\u7cfb\u6b63\u662f\u901a\u8fc7Dict\u6765\u5b9e\u73b0\u7684\u3002 Dict\u7531\u4e09\u90e8\u5206\u7ec4\u6210，\u5206\u522b\u662f：\u54c8\u5e0c\u8868（DictHashTable）\u3001\u54c8\u5e0c\u8282\u70b9（DictEntry）\u548c\u5b57\u5178（Dict）<\/p>\n

                          \/\/ \u54c8\u5e0c\u8868\u7ed3\u6784<\/span>
                          \ntypedef<\/span> struct<\/span> dictht<\/span> {<\/span>
                          \n dictEntry *<\/span>*<\/span>table;<\/span> \/\/ \u54c8\u5e0c\u6876\u6570\u7ec4（\u94fe\u5f0f\u5b58\u50a8）<\/span>
                          \n unsigned<\/span> long<\/span> size;<\/span> \/\/ \u54c8\u5e0c\u8868\u5927\u5c0f（\u6876\u6570\u91cf，2^n）<\/span>
                          \n unsigned<\/span> long<\/span> sizemask;<\/span> \/\/ \u54c8\u5e0c\u63a9\u7801（size-1，\u7528\u4e8e\u8ba1\u7b97\u7d22\u5f15）<\/span>
                          \n unsigned<\/span> long<\/span> used;<\/span> \/\/ \u5df2\u4f7f\u7528\u7684\u6876\u6570\u91cf（\u542b\u94fe\u8868\u8282\u70b9）<\/span>
                          \n}<\/span> dictht;<\/span><\/p>\n

                          \/\/ \u5b57\u5178\u7ed3\u6784<\/span>
                          \ntypedef<\/span> struct<\/span> dict<\/span> {<\/span>
                          \n dictType *<\/span>type;<\/span> \/\/ \u7c7b\u578b\u7279\u5b9a\u51fd\u6570（\u5982\u54c8\u5e0c\u51fd\u6570\u3001\u952e\u6bd4\u8f83\u51fd\u6570）<\/span>
                          \n void<\/span> *<\/span>privdata;<\/span> \/\/ \u79c1\u6709\u6570\u636e（\u7528\u4e8e\u6269\u5c55）<\/span>
                          \n dictht ht[<\/span>2<\/span>]<\/span>;<\/span> \/\/ \u4e24\u4e2a\u54c8\u5e0c\u8868（\u7528\u4e8e\u6e10\u8fdb\u5f0f rehash）<\/span>
                          \n long<\/span> rehashidx;<\/span> \/\/ rehash \u8fdb\u5ea6（-1 \u8868\u793a\u672a\u8fdb\u884c）<\/span>
                          \n int<\/span> iterators;<\/span> \/\/ \u5f53\u524d\u8fd0\u884c\u7684\u8fed\u4ee3\u5668\u6570\u91cf<\/span>
                          \n}<\/span> dict;<\/span><\/p>\n

                          \/\/ \u54c8\u5e0c\u8868\u8282\u70b9（\u94fe\u8868\u7ed3\u6784）<\/span>
                          \ntypedef<\/span> struct<\/span> dictEntry<\/span> {<\/span>
                          \n void<\/span> *<\/span>key;<\/span> \/\/ \u952e<\/span>
                          \n union<\/span> {<\/span>
                          \n void<\/span> *<\/span>val;<\/span>
                          \n uint64_t<\/span> u64;<\/span>
                          \n int64_t<\/span> s64;<\/span>
                          \n double<\/span> d;<\/span>
                          \n }<\/span> v;<\/span> \/\/ \u503c（\u652f\u6301\u591a\u79cd\u7c7b\u578b）<\/span>
                          \n struct<\/span> dictEntry<\/span> *<\/span>next;<\/span> \/\/ \u6307\u5411\u4e0b\u4e00\u4e2a\u8282\u70b9（\u89e3\u51b3\u54c8\u5e0c\u51b2\u7a81）<\/span>
                          \n}<\/span> dictEntry;<\/span><\/p>\n

                          \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

                          \u4e8c\u3001dict \u7684\u6838\u5fc3\u673a\u5236<\/h4>\n

                          1. \u54c8\u5e0c\u51fd\u6570\u4e0e\u51b2\u7a81\u89e3\u51b3<\/h5>\n
                            \n
                          • \u54c8\u5e0c\u51fd\u6570：Redis \u9ed8\u8ba4\u4f7f\u7528 MurmurHash2 \u7b97\u6cd5（\u975e\u52a0\u5bc6\u578b，\u9ad8\u6027\u80fd，\u5206\u5e03\u5747\u5300）\u3002<\/li>\n
                          • \u51b2\u7a81\u89e3\u51b3：\u91c7\u7528 \u94fe\u5730\u5740\u6cd5（Separate Chaining），\u540c\u4e00\u6876\u5185\u7684\u8282\u70b9\u4ee5\u94fe\u8868\u8fde\u63a5\u3002<\/li>\n<\/ul>\n
                            2.\u6269\u5bb9<\/h5>\n
                            \u89e6\u53d1\u6761\u4ef6<\/h6>\n
                              \n
                            • \u8d1f\u8f7d\u56e0\u5b50（Load Factor）：\n
                                \n
                              • \u5e38\u89c4\u6269\u5bb9：load_factor = used \/ size \u2265 1，\u4e14\u5f53\u524d\u672a\u5728\u540e\u53f0\u6267\u884c BGSAVE \u6216 BGREWRITEAOF\u3002<\/li>\n
                              • \u5f3a\u5236\u6269\u5bb9：load_factor \u2265 5（\u65e0\u8bba\u662f\u5426\u5728\u6267\u884c\u6301\u4e45\u5316\u64cd\u4f5c，\u907f\u514d\u54c8\u5e0c\u51b2\u7a81\u4e25\u91cd\u5bfc\u81f4\u6027\u80fd\u9aa4\u964d）\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

                                \u6269\u5bb9\u6d41\u7a0b<\/p>\n

                              • \n

                                \u8ba1\u7b97\u65b0\u8868\u5927\u5c0f：<\/p>\n

                                  \n
                                • \u65b0\u54c8\u5e0c\u8868\u7684\u5927\u5c0f\u4e3a \u7b2c\u4e00\u4e2a \u2265 used \\\\* 2 \u7684 2^n（\u5982 used=3 \u2192 size=8）\u3002<\/li>\n
                                • \u82e5\u5f53\u524d\u6b63\u5728\u6267\u884c BGSAVE \u6216 BGREWRITEAOF，Redis \u4f1a \u5ef6\u8fdf\u6269\u5bb9（\u907f\u514d\u8d44\u6e90\u8fc7\u5ea6\u6d88\u8017）\u3002<\/li>\n<\/ul>\n<\/li>\n
                                • \n

                                  \u521d\u59cb\u5316\u65b0\u54c8\u5e0c\u8868（ht[1]）：<\/p>\n

                                  \/\/ \u5206\u914d\u65b0\u54c8\u5e0c\u8868\u5185\u5b58<\/span>
                                  \ndictht *<\/span>new_ht =<\/span> &<\/span>d-><\/span>ht[<\/span>1<\/span>]<\/span>;<\/span>
                                  \nnew_ht-><\/span>size =<\/span> next_power<\/span>(<\/span>used *<\/span> 2<\/span>)<\/span>;<\/span>
                                  \nnew_ht-><\/span>table =<\/span> zcalloc<\/span>(<\/span>new_ht-><\/span>size *<\/span> sizeof<\/span>(<\/span>dictEntry*<\/span>)<\/span>)<\/span>;<\/span>
                                  \nnew_ht-><\/span>sizemask =<\/span> new_ht-><\/span>size –<\/span> 1<\/span>;<\/span>\n <\/li>\n

                                • \n

                                  \u542f\u52a8\u6e10\u8fdb\u5f0f Rehash：<\/p>\n

                                    \n
                                  • \u8bbe\u7f6e rehashidx = 0，\u8868\u793a\u5f00\u59cb\u4ece\u65e7\u8868 ht[0] \u7684\u7b2c 0 \u53f7\u6876\u8fc1\u79fb\u6570\u636e\u5230 ht[1]\u3002<\/li>\n
                                  • \u540e\u7eed\u6bcf\u6b21\u5bf9\u5b57\u5178\u7684\u589e\u5220\u6539\u67e5\u64cd\u4f5c，\u5747\u8fc1\u79fb\u4e00\u4e2a\u6876\u7684\u6570\u636e，\u76f4\u5230\u5b8c\u6210\u6240\u6709\u8fc1\u79fb\u3002<\/li>\n<\/ul>\n<\/li>\n

                                    \u6269\u5bb9\u8bbe\u8ba1\u601d\u60f3<\/p>\n

                                      \n
                                    • 2^n \u5927\u5c0f：\u901a\u8fc7\u4f4d\u8fd0\u7b97（hash & sizemask）\u5feb\u901f\u8ba1\u7b97\u7d22\u5f15\u3002<\/li>\n
                                    • \u6e10\u8fdb\u5f0f\u8fc1\u79fb：\u907f\u514d\u4e00\u6b21\u6027\u8fc1\u79fb\u5927\u91cf\u6570\u636e\u5bfc\u81f4\u670d\u52a1\u963b\u585e\u3002<\/li>\n<\/ul>\n
                                      \n

                                      \u4e09\u3001\u7f29\u5bb9<\/h4>\n

                                      1. \u89e6\u53d1\u6761\u4ef6<\/h5>\n
                                        \n
                                      • \u8d1f\u8f7d\u56e0\u5b50（Load Factor）：load_factor = used \/ size < 0.1（\u9ed8\u8ba4\u9608\u503c）\u3002<\/li>\n<\/ul>\n
                                        2. \u7f29\u5bb9\u6d41\u7a0b<\/h5>\n
                                      • \n

                                        \u8ba1\u7b97\u65b0\u8868\u5927\u5c0f：<\/p>\n

                                          \n
                                        • \u65b0\u54c8\u5e0c\u8868\u7684\u5927\u5c0f\u4e3a \u7b2c\u4e00\u4e2a \u2265 used \u7684 2^n（\u5982 used=3 \u2192 size=4）\u3002<\/li>\n
                                        • \u82e5 used=0，\u5219\u76f4\u63a5\u91ca\u653e\u65e7\u8868，\u91cd\u7f6e\u4e3a\u521d\u59cb\u72b6\u6001\u3002<\/li>\n<\/ul>\n<\/li>\n
                                        • \n

                                          \u521d\u59cb\u5316\u65b0\u54c8\u5e0c\u8868（ht[1]）：<\/p>\n

                                          dictht *<\/span>new_ht =<\/span> &<\/span>d-><\/span>ht[<\/span>1<\/span>]<\/span>;<\/span>
                                          \nnew_ht-><\/span>size =<\/span> next_power<\/span>(<\/span>used)<\/span>;<\/span>
                                          \nnew_ht-><\/span>table =<\/span> zcalloc<\/span>(<\/span>new_ht-><\/span>size *<\/span> sizeof<\/span>(<\/span>dictEntry*<\/span>)<\/span>)<\/span>;<\/span>
                                          \nnew_ht-><\/span>sizemask =<\/span> new_ht-><\/span>size –<\/span> 1<\/span>;<\/span>\n <\/li>\n

                                        • \n

                                          \u542f\u52a8\u6e10\u8fdb\u5f0f Rehash：<\/p>\n

                                            \n
                                          • \u4e0e\u6269\u5bb9\u76f8\u540c，\u9010\u6b65\u8fc1\u79fb\u6570\u636e\u5230\u65b0\u8868 ht[1]\u3002<\/li>\n
                                          • \u8fc1\u79fb\u5b8c\u6210\u540e，\u91ca\u653e\u65e7\u8868 ht[0]，\u5c06 ht[1] \u8bbe\u4e3a ht[0]\u3002<\/li>\n<\/ul>\n<\/li>\n
                                            3. \u7f29\u5bb9\u8bbe\u8ba1\u601d\u60f3<\/h5>\n
                                              \n
                                            • \u8282\u7701\u5185\u5b58：\u907f\u514d\u56e0\u6570\u636e\u5220\u9664\u540e\u54c8\u5e0c\u8868\u8fc7\u5927\u5bfc\u81f4\u5185\u5b58\u6d6a\u8d39\u3002<\/li>\n
                                            • \u5ef6\u8fdf\u7f29\u5bb9：\u9632\u6b62\u9891\u7e41\u7f29\u5bb9\u89e6\u53d1\u6027\u80fd\u6296\u52a8\u3002<\/li>\n<\/ul>\n
                                              \n

                                              \u56db\u3001\u6e10\u8fdb\u5f0f Rehash \u7684\u901a\u7528\u6d41\u7a0b<\/h4>\n

                                              \u65e0\u8bba\u662f\u6269\u5bb9\u8fd8\u662f\u7f29\u5bb9，\u5fc5\u5b9a\u4f1a\u521b\u5efa\u65b0\u7684\u54c8\u5e0c\u8868，\u5bfc\u81f4\u54c8\u5e0c\u8868\u7684size\u548csizemask\u53d8\u5316，\u800ckey\u7684\u67e5\u8be2\u4e0esizemask\u6709\u5173\u3002\u540c\u65f6\u4e3a\u4e86\u9632\u6b62\u4e00\u6b21\u8f6c\u79fb\u5bfc\u81f4\u7684\u6027\u80fd\u6296\u52a8，\u91c7\u7528\u6e10\u8fdb\u5f0f Rehash \u5b8c\u6210\u6570\u636e\u8fc1\u79fb：<\/p>\n

                                            • \n

                                              \u6bcf\u6b21\u64cd\u4f5c\u89e6\u53d1\u8fc1\u79fb：<\/p>\n

                                                \n
                                              • \u5bf9\u5b57\u5178\u7684 \u589e\u3001\u5220\u3001\u6539\u3001\u67e5 \u64cd\u4f5c\u5747\u53ef\u80fd\u89e6\u53d1\u8fc1\u79fb\u4e00\u4e2a\u6876\u7684\u6570\u636e\u3002<\/li>\n
                                              • \u8fc1\u79fb\u7684\u6876\u53f7\u4e3a rehashidx，\u5b8c\u6210\u540e rehashidx++\u3002<\/li>\n<\/ul>\n<\/li>\n
                                              • \n

                                                \u8fc1\u79fb\u5355\u4e2a\u6876\u7684\u6b65\u9aa4： a. \u904d\u5386\u65e7\u6876\u94fe\u8868：\u5904\u7406 ht[0].table[rehashidx] \u7684\u6240\u6709\u8282\u70b9\u3002 b. \u91cd\u65b0\u54c8\u5e0c\u8ba1\u7b97\u7d22\u5f15：\u5bf9\u65b0\u8868 ht[1] \u8ba1\u7b97\u6bcf\u4e2a\u8282\u70b9\u7684\u54c8\u5e0c\u503c\u548c\u7d22\u5f15\u3002<\/p>\n

                                                for<\/span> (<\/span>entry =<\/span> old_table[<\/span>rehashidx]<\/span>;<\/span> entry !=<\/span> NULL<\/span>;<\/span> entry =<\/span> next_entry)<\/span> {<\/span>
                                                \n next_entry =<\/span> entry-><\/span>next;<\/span>
                                                \n \/\/ \u8ba1\u7b97\u65b0\u7d22\u5f15<\/span>
                                                \n uint64_t<\/span> hash =<\/span> dict-><\/span>type-><\/span>hashFunction<\/span>(<\/span>entry-><\/span>key)<\/span>;<\/span>
                                                \n uint64_t<\/span> new_index =<\/span> hash &<\/span> new_sizemask;<\/span>
                                                \n \/\/ \u63d2\u5165\u65b0\u8868<\/span>
                                                \n entry-><\/span>next =<\/span> new_table[<\/span>new_index]<\/span>;<\/span>
                                                \n new_table[<\/span>new_index]<\/span> =<\/span> entry;<\/span>
                                                \n}<\/span><\/p>\n

                                                c. \u6e05\u7a7a\u65e7\u6876：\u5c06 ht[0].table[rehashidx] \u8bbe\u4e3a NULL\u3002 d. \u66f4\u65b0\u8ba1\u6570\u5668：\u9012\u51cf ht[0].used，\u9012\u589e ht[1].used\u3002<\/p>\n<\/li>\n

                                              • \n

                                                \u68c0\u67e5\u8fc1\u79fb\u5b8c\u6210：<\/p>\n

                                                  \n
                                                • \u5f53 rehashidx >= ht[0].size \u65f6，\u6240\u6709\u6876\u8fc1\u79fb\u5b8c\u6210\u3002<\/li>\n
                                                • \u91ca\u653e\u65e7\u8868：\u9500\u6bc1 ht[0].table，\u5c06 ht[1] \u8bbe\u4e3a ht[0]，\u91cd\u7f6e ht[1] \u4e3a\u7a7a\u3002<\/li>\n
                                                • \u7ed3\u675f Rehash：\u8bbe\u7f6e rehashidx = -1\u3002<\/li>\n<\/ul>\n<\/li>\n

                                                  \u4e09\u3001\u6dfb\u52a0\u952e\u503c\u5bf9\u7684\u6838\u5fc3\u6d41\u7a0b<\/h4>\n

                                                  1. \u68c0\u67e5 Rehash \u72b6\u6001<\/h5>\n
                                                    \n
                                                  • \u5224\u65ad\u662f\u5426\u5904\u4e8e Rehash：\n
                                                      \n
                                                    • \u82e5\u5b57\u5178\u7684 rehashidx != -1，\u8868\u793a\u6b63\u5728\u8fdb\u884c \u6e10\u8fdb\u5f0f Rehash（\u6570\u636e\u4ece\u65e7\u8868 ht[0] \u8fc1\u79fb\u5230\u65b0\u8868 ht[1]）\u3002<\/li>\n
                                                    • \u76f4\u63a5\u64cd\u4f5c\u65b0\u8868：\u6240\u6709\u65b0\u63d2\u5165\u7684\u952e\u503c\u5bf9\u4f1a\u5199\u5165 ht[1]，\u907f\u514d\u65e7\u8868 ht[0] \u7ee7\u7eed\u79ef\u7d2f\u6570\u636e\u3002<\/li>\n
                                                    • \u89e6\u53d1\u8fc1\u79fb：\u6bcf\u6b21\u63d2\u5165\u64cd\u4f5c\u540e，\u987a\u5e26\u8fc1\u79fb ht[0] \u4e2d\u7684\u4e00\u4e2a\u6876（Bucket）\u5230 ht[1]，\u9010\u6b65\u5b8c\u6210\u6570\u636e\u8fc1\u79fb\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
                                                      2. \u8ba1\u7b97\u54c8\u5e0c\u503c\u4e0e\u7d22\u5f15<\/h5>\n
                                                        \n
                                                      • \n

                                                        \u54c8\u5e0c\u51fd\u6570：\u4f7f\u7528\u9884\u8bbe\u7684\u54c8\u5e0c\u7b97\u6cd5（\u5982 MurmurHash2）\u8ba1\u7b97\u952e\u7684\u54c8\u5e0c\u503c\u3002<\/p>\n

                                                        hash =<\/span> dict-><\/span>type-><\/span>hashFunction<\/span>(<\/span>key)<\/span>;<\/span> \/\/ \u4f8b\u5982，MurmurHash2<\/span>\n <\/li>\n

                                                      • \n

                                                        \u786e\u5b9a\u6876\u7d22\u5f15：\u901a\u8fc7\u54c8\u5e0c\u503c\u4e0e\u5f53\u524d\u54c8\u5e0c\u8868\u7684\u5927\u5c0f\u63a9\u7801（sizemask = size – 1）\u8ba1\u7b97\u7d22\u5f15\u3002<\/p>\n

                                                        index =<\/span> hash &<\/span> dict-><\/span>ht[<\/span>table]<\/span>.<\/span>sizemask;<\/span> \/\/ table=0 \u6216 1（\u53d6\u51b3\u4e8e\u662f\u5426\u5728 Rehash）<\/span>\n <\/li>\n<\/ul>\n

                                                        3. \u5904\u7406\u952e\u7684\u5b58\u5728\u6027<\/h5>\n
                                                          \n
                                                        • \n

                                                          \u904d\u5386\u94fe\u8868：\u5728\u76ee\u6807\u6876\u7684\u94fe\u8868\u4e2d\u987a\u5e8f\u67e5\u627e\u952e\u662f\u5426\u5b58\u5728\u3002<\/p>\n

                                                            \n
                                                          • \n

                                                            \u952e\u5df2\u5b58\u5728：<\/p>\n

                                                              \n
                                                            • \u66ff\u6362\u65e7\u503c，\u91ca\u653e\u65e7\u503c\u5185\u5b58（\u82e5\u914d\u7f6e\u4e86\u503c\u91ca\u653e\u51fd\u6570）\u3002<\/li>\n
                                                            • \u8fd4\u56de DICT_OK \u8868\u793a\u66f4\u65b0\u6210\u529f\u3002<\/li>\n<\/ul>\n<\/li>\n
                                                            • \n

                                                              \u952e\u4e0d\u5b58\u5728：<\/p>\n

                                                                \n
                                                              • \u521b\u5efa\u65b0\u8282\u70b9 dictEntry，\u5c06\u952e\u503c\u5bf9\u5b58\u5165\u3002<\/li>\n
                                                              • \u5934\u63d2\u6cd5\u63d2\u5165\u94fe\u8868：\u5c06\u65b0\u8282\u70b9\u63d2\u5165\u94fe\u8868\u5934\u90e8（\u65f6\u95f4\u590d\u6742\u5ea6 O(1)）\u3002<\/li>\n<\/ul>\n

                                                                entry-><\/span>next =<\/span> ht-><\/span>table[<\/span>index]<\/span>;<\/span>
                                                                \nht-><\/span>table[<\/span>index]<\/span> =<\/span> entry;<\/span>\n <\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

                                                                4. \u66f4\u65b0\u8ba1\u6570\u5668\u4e0e\u89e6\u53d1\u6269\u5bb9<\/h5>\n
                                                                  \n
                                                                • \n

                                                                  \u66f4\u65b0\u8ba1\u6570\u5668：\u9012\u589e\u54c8\u5e0c\u8868\u7684 used \u8ba1\u6570\u5668，\u8868\u793a\u5df2\u7528\u6876\u6570\u91cf\u589e\u52a0\u3002<\/p>\n

                                                                  ht-><\/span>used++<\/span>;<\/span>\n <\/li>\n

                                                                • \n

                                                                  \u68c0\u67e5\u6269\u5bb9\u6761\u4ef6：<\/p>\n

                                                                    \n
                                                                  • \u8d1f\u8f7d\u56e0\u5b50：\u8ba1\u7b97 load_factor = used \/ size\u3002<\/li>\n
                                                                  • \u89e6\u53d1\u6269\u5bb9：\n
                                                                      \n
                                                                    • \u5e38\u89c4\u6269\u5bb9：\u82e5 load_factor \u2265 1 \u4e14\u5141\u8bb8\u6269\u5bb9\u3002<\/li>\n
                                                                    • \u5f3a\u5236\u6269\u5bb9：\u82e5 load_factor \u2265 5（\u907f\u514d\u54c8\u5e0c\u51b2\u7a81\u4e25\u91cd\u5bfc\u81f4\u6027\u80fd\u9aa4\u964d）\u3002<\/li>\n<\/ul>\n<\/li>\n
                                                                    • \u6269\u5bb9\u64cd\u4f5c：\n
                                                                    • \u521b\u5efa\u65b0\u54c8\u5e0c\u8868 ht[1]，\u5927\u5c0f\u4e3a\u7b2c\u4e00\u4e2a \u2265 used * 2 \u7684 2 \u7684\u5e42\u6b21（\u5982 used=4 \u2192 size=8）\u3002<\/li>\n
                                                                    • \u8bbe\u7f6e rehashidx=0，\u542f\u52a8\u6e10\u8fdb\u5f0f Rehash\u3002<\/li>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
                                                                      5. \u8fd4\u56de\u7ed3\u679c<\/h5>\n
                                                                        \n
                                                                      • \u6210\u529f：\u8fd4\u56de DICT_OK\u3002<\/li>\n
                                                                      • \u5931\u8d25：\u82e5\u5185\u5b58\u5206\u914d\u5931\u8d25（\u5982\u65e0\u6cd5\u521b\u5efa\u65b0\u8282\u70b9），\u8fd4\u56de DICT_ERR\u3002<\/li>\n<\/ul>\n

                                                                        graph TD
                                                                        \n subgraph \u6dfb\u52a0\u952e\u503c\u5bf9\u6838\u5fc3\u6d41\u7a0b
                                                                        \n start([\u5f00\u59cb]) –> check_rehash{\u68c0\u67e5Rehash\u72b6\u6001}<\/p>\n

                                                                        check_rehash –> |rehashidx != -1| new_table[\u64cd\u4f5c\u65b0\u8868ht<x-preset class="no-tts reference-tag disable-to-doc" data-index="1">1<\/x-preset>]
                                                                        \n new_table –> migrate[\u8fc1\u79fbht<x-preset class="no-tts reference-tag disable-to-doc" data-index="0">0<\/x-preset>\u7684\u4e00\u4e2a\u6876\u5230ht<x-preset class="no-tts reference-tag disable-to-doc" data-index="1">1<\/x-preset>]<\/p>\n

                                                                        check_rehash –> |rehashidx = -1| compute_hash[\u8ba1\u7b97\u54c8\u5e0c\u503c]
                                                                        \n migrate –> compute_hash<\/p>\n

                                                                        compute_hash –> get_index[\u8ba1\u7b97\u6876\u7d22\u5f15: hash & sizemask]<\/p>\n

                                                                        get_index –> key_check{\u952e\u662f\u5426\u5b58\u5728?}<\/p>\n

                                                                        key_check –> |\u5b58\u5728| replace[\u66ff\u6362\u65e7\u503c\u5e76\u91ca\u653e\u5185\u5b58]
                                                                        \n replace –> return_ok[\u8fd4\u56deDICT_OK]<\/p>\n

                                                                        key_check –> |\u4e0d\u5b58\u5728| create_entry[\u521b\u5efa\u65b0dictEntry]
                                                                        \n create_entry –> insert[\u5934\u63d2\u6cd5\u63d2\u5165\u94fe\u8868]
                                                                        \n insert –> update_counter[\u66f4\u65b0used\u8ba1\u6570\u5668]<\/p>\n

                                                                        update_counter –> check_expand{\u68c0\u67e5\u6269\u5bb9\u6761\u4ef6}<\/p>\n

                                                                        check_expand –> |load_factor \u22651| normal_expand[\u5e38\u89c4\u6269\u5bb9]
                                                                        \n check_expand –> |load_factor \u22655| force_expand[\u5f3a\u5236\u6269\u5bb9]<\/p>\n

                                                                        normal_expand –> create_ht1[\u521b\u5efaht<x-preset class="no-tts reference-tag disable-to-doc" data-index="1">1<\/x-preset>\\\\n\u5927\u5c0f\u4e3aused*2\u76842^n]
                                                                        \n force_expand –> create_ht1
                                                                        \n create_ht1 –> start_rehash[\u8bbe\u7f6erehashidx=0]<\/p>\n

                                                                        start_rehash –> return_ok
                                                                        \n return_ok –> end_process([\u7ed3\u675f])<\/p>\n

                                                                        check_expand –> |\u65e0\u9700\u6269\u5bb9| return_ok
                                                                        \n end_process
                                                                        \n end<\/p>\n

                                                                        Ziplist<\/h3>\n

                                                                        \u4e00\u3001ziplist\u7684\u7ed3\u6784\u8bbe\u8ba1<\/h4>\n

                                                                        1.\u6574\u4f53\u5e03\u5c40<\/h5>\n

                                                                        \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

                                                                          \n
                                                                        • **zlbytes（4\u5b57\u8282）😗*\u603b\u5b57\u8282\u6570，\u7528\u4e8e\u5feb\u901f\u83b7\u53d6\u5217\u8868\u5927\u5c0f\u3002<\/li>\n
                                                                        • **zltail（4\u5b57\u8282）😗*\u5c3e\u8282\u70b9\u504f\u79fb\u91cf，\u7528\u4e8e\u5b9a\u4f4d\u5c3e\u8282\u70b9\u3002<\/li>\n
                                                                        • **zllen（2\u5b57\u8282）😗*\u8282\u70b9\u957f\u5ea6（\u6570\u91cf）（\u82e5\u8d85\u8fc765535，\u9700\u904d\u5386\u8ba1\u7b97）\u3002<\/li>\n
                                                                        • **entry:**\u8282\u70b9\u5355\u5143，\u5b58\u50a8\u6570\u636e\u3002<\/li>\n
                                                                        • **zlend（1\u5b57\u8282）😗*\u7ed3\u675f\u6807\u8bc6（0xFF）\u3002<\/li>\n<\/ul>\n
                                                                          2.Entry\u7ed3\u6784<\/h5>\n

                                                                          \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

                                                                            \n
                                                                          • **previous_entry_length（1\u62165\u5b57\u8282）😗*\u524d\u4e00\u8282\u70b9\u5355\u5143\u5927\u5c0f\u3002\n
                                                                              \n
                                                                            • \u524d\u9a71\u957f\u5ea6\u2264 253:prelen\u5360\u4e00\u5b57\u8282\u3002<\/li>\n
                                                                            • \u524d\u9a71\u957f\u5ea6 > 253：prevlen \u9996\u5b57\u8282\u56fa\u5b9a\u4e3a 0xFE，\u540e4\u5b57\u8282\u5b58\u50a8\u5b9e\u9645\u957f\u5ea6\u3002<\/li>\n<\/ul>\n<\/li>\n
                                                                            • **encoding（1\u30012\u30015\u5b57\u8282）😗*\u7f16\u7801\u5c5e\u6027，\u7528\u4e8e\u6807\u8bc6content\u7684\u7c7b\u578b（\u5b57\u7b26\u4e32\u6216\u6574\u6570）\u548c\u957f\u5ea6\u3002<\/li>\n
                                                                            • **content:**\u4fdd\u5b58\u6570\u636e（\u5b57\u7b26\u4e32\u6216\u6574\u6570）\u3002<\/li>\n<\/ul>\n
                                                                              3.Encoding\u7f16\u7801<\/h5>\n

                                                                              \u5206\u4e3a\u5b57\u7b26\u4e32\u548c\u6574\u6570\u4e24\u79cd<\/p>\n

                                                                              \u5b57\u7b26\u4e32\u7c7b\u578b\u7f16\u7801<\/h6>\n

                                                                              \u5b57\u7b26\u4e32\u7c7b\u578b\u4ee500（1\u5b57\u8282）\u300101（2\u5b57\u8282）\u300110（5\u5b57\u8282）\u5f00\u5934，\u9664\u524d\u4e24\u4f4d\u5916\u5176\u4f59\u4f4d\u5747\u8bb0\u5f55\u5b57\u7b26\u4e32\u5927\u5c0f\u3002<\/p>\n\n\u7f16\u7801\u7f16\u7801\u957f\u5ea6\u5b57\u7b26\u4e32\u5927\u5c0f<\/tr>\n\n\n\n\n
                                                                              |00pppppp|<\/td>\n1 bytes<\/td>\n<= 63 bytes<\/td>\n<\/tr>\n
                                                                              |01pppppp|qqqqqqqq|<\/td>\n2 bytes<\/td>\n<= 16383 bytes<\/td>\n<\/tr>\n
                                                                              |10000000|qqqqqqqq|rrrrrrrr|ssssssss|tttttttt|<\/td>\n5 bytes<\/td>\n<= 4294967295 bytes<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
                                                                              \u6574\u6570\u7c7b\u578b\u7f16\u7801<\/h6>\n

                                                                              \u6574\u6570\u7c7b\u578b\u4ee511\u5f00\u5934，\u56fa\u5b9a\u4e3a1\u5b57\u8282，\u5176\u4f59\u516d\u4f4d\u6807\u8bc6\u4e94\u79cd\u6574\u6570\u7c7b\u578b\u5206\u522b\u5360\u636e\u4e8600|0000\u300101|0000\u300110|0000\u3002\u8fd9\u6837\u6211\u4eec\u5c31\u80fd\u752811|xxxx\u76f4\u63a5\u4fdd\u5b58\u6570\u636e\u5728\u540e\u56db\u4f4d，\u800c11|0000\u548c11|1110\u30010xff（\u7ed3\u675f\u6807\u8bc6）\u88ab\u5360\u636e\u6240\u4ee5\u5177\u4f53\u53ef\u5b58\u50a8\u503c\u670913\u4e2a\u3002<\/p>\n\n\u7f16\u7801\u7f16\u7801\u957f\u5ea6\u6574\u6570\u7c7b\u578b<\/tr>\n\n\n\n\n\n\n\n
                                                                              11000000<\/td>\n1<\/td>\nint16_t（2 bytes）<\/td>\n<\/tr>\n
                                                                              11010000<\/td>\n1<\/td>\nint32_t（4 bytes）<\/td>\n<\/tr>\n
                                                                              11100000<\/td>\n1<\/td>\nint64_t（8 bytes）<\/td>\n<\/tr>\n
                                                                              11110000<\/td>\n1<\/td>\n24\u4f4d\u6709\u7b26\u6574\u6570(3 bytes)<\/td>\n<\/tr>\n
                                                                              11111110<\/td>\n1<\/td>\n8\u4f4d\u6709\u7b26\u6574\u6570(1 bytes)<\/td>\n<\/tr>\n
                                                                              1111xxxx<\/td>\n1<\/td>\n\u76f4\u63a5\u5728xxxx\u4f4d\u7f6e\u4fdd\u5b58\u6570\u503c，\u8303\u56f4\u4ece0001~1101，\u51cf1\u540e\u7ed3\u679c\u4e3a\u5b9e\u9645\u503c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                                                              \u4e8c\u3001ziplist \u7684\u6838\u5fc3\u7279\u6027<\/h4>\n

                                                                              1. \u5185\u5b58\u7d27\u51d1<\/h5>\n
                                                                                \n
                                                                              • \u8fde\u7eed\u5b58\u50a8：\u6d88\u9664\u6307\u9488\u5f00\u9500，\u5185\u5b58\u5229\u7528\u7387\u9ad8\u3002<\/li>\n
                                                                              • \u53d8\u957f\u7f16\u7801：\u6839\u636e\u6570\u636e\u52a8\u6001\u8c03\u6574\u5b58\u50a8\u7a7a\u95f4（\u5982\u5c0f\u6574\u6570\u75281\u5b57\u8282）\u3002<\/li>\n<\/ul>\n
                                                                                2. \u53cc\u5411\u904d\u5386<\/h5>\n
                                                                                  \n
                                                                                • \u524d\u9a71\u6307\u9488\u6a21\u62df：\u901a\u8fc7 prevlen \u5b57\u6bb5\u53cd\u5411\u8ba1\u7b97\u524d\u9a71 entry \u8d77\u59cb\u4f4d\u7f6e\u3002<\/li>\n
                                                                                • \u6b63\u5411\u904d\u5386：\u5229\u7528 encoding \u89e3\u6790\u5f53\u524d entry \u957f\u5ea6，\u8df3\u81f3\u4e0b\u4e00 entry\u3002<\/li>\n<\/ul>\n
                                                                                  3. \u81ea\u52a8\u7f16\u7801\u8f6c\u6362<\/h5>\n
                                                                                    \n
                                                                                  • \u9608\u503c\u63a7\u5236：\u5f53\u5143\u7d20\u6570\u91cf\u6216\u5927\u5c0f\u8d85\u8fc7\u914d\u7f6e（\u5982 hash-max-ziplist-entries），\u8f6c\u4e3a\u6807\u51c6\u7ed3\u6784（\u5982\u54c8\u5e0c\u8868）\u3002<\/li>\n<\/ul>\n
                                                                                    \n

                                                                                    \u4e09\u3001ziplist \u7684\u64cd\u4f5c\u673a\u5236<\/h4>\n

                                                                                    1. \u63d2\u5165\u64cd\u4f5c<\/h5>\n
                                                                                      \n
                                                                                    • \u5b9a\u4f4d\u63d2\u5165\u70b9：\u904d\u5386\u627e\u5230\u4f4d\u7f6e，\u8ba1\u7b97\u6240\u9700\u7a7a\u95f4\u3002<\/li>\n
                                                                                    • \u5185\u5b58\u91cd\u5206\u914d：\u6269\u5c55 ziplist \u5185\u5b58，\u79fb\u52a8\u540e\u7eed entry\u3002<\/li>\n
                                                                                    • \u66f4\u65b0\u524d\u540e entry：\n
                                                                                        \n
                                                                                      • \u4fee\u6539\u540e\u7ee7 entry \u7684 prevlen\u3002<\/li>\n
                                                                                      • \u53ef\u80fd\u89e6\u53d1 \u7ea7\u8054\u66f4\u65b0（Cascade Update）：\u82e5\u65b0 entry \u5bfc\u81f4\u540e\u7ee7 entry \u7684 prevlen \u6269\u5bb9（1\u21925\u5b57\u8282），\u9700\u9012\u5f52\u5904\u7406\u540e\u7eed entry\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
                                                                                        2. \u5220\u9664\u64cd\u4f5c<\/h5>\n
                                                                                          \n
                                                                                        • \u5185\u5b58\u7f29\u5bb9：\u79fb\u9664 entry \u540e，\u524d\u79fb\u540e\u7eed\u6570\u636e\u3002<\/li>\n
                                                                                        • \u7ea7\u8054\u66f4\u65b0\u98ce\u9669：\u7c7b\u4f3c\u63d2\u5165，\u53ef\u80fd\u89e6\u53d1\u540e\u7ee7 entry \u7684 prevlen \u8c03\u6574\u3002<\/li>\n<\/ul>\n
                                                                                          3. \u67e5\u8be2\u64cd\u4f5c<\/h5>\n
                                                                                            \n
                                                                                          • \u987a\u5e8f\u904d\u5386：\u4ece\u5934\u6216\u5c3e（\u5229\u7528 zltail）\u5f00\u59cb，\u89e3\u6790\u6bcf\u4e2a entry \u7684 encoding \u548c prevlen\u3002<\/li>\n<\/ul>\n
                                                                                            \n

                                                                                            \u56db\u3001\u7ea7\u8054\u66f4\u65b0（Cascade Update）<\/h4>\n

                                                                                            1. \u89e6\u53d1\u6761\u4ef6<\/h5>\n

                                                                                            \u63d2\u5165\u6216\u5220\u9664 entry \u5bfc\u81f4\u540e\u7ee7 entry \u7684 prevlen \u4ece1\u5b57\u8282\u6269\u5c55\u4e3a5\u5b57\u8282（\u6216\u53cd\u5411\u6536\u7f29）<\/p>\n

                                                                                            \u4f8b\u5982\u8fde\u7eed\u8282\u70b9\u5927\u5c0f\u4e3a250-253（\u524d\u9a71\u8282\u70b9\u5927\u5c0f1\u5b57\u8282），\u6709\u4e00\u8282\u70b9\u6570\u636e\u53d8\u66f4\u8d85\u51fa253\u5b57\u8282，\u540e\u7eed\u8282\u70b9\u7684prelen\u53d8\u4e3a5\u5b57\u8282\u5b58\u50a8，\u53d8\u66f4\u540e\u8fd9\u4e2a\u8282\u70b9\u7684\u5927\u5c0f\u4e5f\u8d85\u8fc7\u4e86253\u5b57\u8282，\u5faa\u73af\u5f80\u590d\u3002<\/p>\n

                                                                                            2. \u6027\u80fd\u5f71\u54cd<\/h5>\n
                                                                                              \n
                                                                                            • \u6700\u574f\u65f6\u95f4\u590d\u6742\u5ea6：O(n\u00b2)（\u5982\u6240\u6709 entry \u7684 prevlen \u5747\u9700\u8c03\u6574）\u3002<\/li>\n
                                                                                            • \u5b9e\u9645\u573a\u666f：\u6982\u7387\u6781\u4f4e，\u901a\u5e38\u5728\u5c0f\u89c4\u6a21 ziplist \u4e2d\u5f71\u54cd\u6709\u9650\u3002<\/li>\n<\/ul>\n

                                                                                              QuickList<\/h3>\n

                                                                                              quicklist \u662f Redis \u7528\u4e8e\u5b9e\u73b0 \u5217\u8868（List） \u6570\u636e\u7c7b\u578b\u7684\u6838\u5fc3\u6570\u636e\u7ed3\u6784，\u7ed3\u5408\u4e86 ziplist（\u538b\u7f29\u5217\u8868）\u548c linkedlist（\u53cc\u5411\u94fe\u8868）\u7684\u4f18\u52bf，\u5728\u5185\u5b58\u6548\u7387\u4e0e\u64cd\u4f5c\u6027\u80fd\u4e4b\u95f4\u53d6\u5f97\u5e73\u8861\u3002<\/p>\n

                                                                                              \u4e00\u3001qiucklist\u7684\u8bbe\u8ba1\u80cc\u666f<\/h4>\n

                                                                                              1.\u65e9\u671f\u5217\u8868\u5b9e\u73b0\u7684\u4e0d\u8db3<\/h5>\n
                                                                                                \n
                                                                                              • ziplist\n
                                                                                                  \n
                                                                                                • **\u4f18\u70b9：**\u5185\u5b58\u7d27\u51d1，\u4e0d\u9700\u8981\u6307\u9488\u5360\u636e\u989d\u5916\u5185\u5b58\u7a7a\u95f4\u3002<\/li>\n
                                                                                                • **\u7f3a\u70b9：**\u63d2\u5165\u3001\u5220\u9664\u64cd\u4f5c\u9700\u91cd\u5206\u914d\u5185\u5b58，\u79fb\u52a8\u540e\u7eed\u8282\u70b9，\u5927\u89c4\u6a21\u6570\u636e\u4e0b\u6027\u80fd\u5dee\u3002<\/li>\n<\/ul>\n<\/li>\n
                                                                                                • linedlist\n
                                                                                                    \n
                                                                                                  • \u4f18\u70b9：\u63d2\u5165\u3001\u5220\u9664\u9ad8\u6548\u3002<\/li>\n
                                                                                                  • \u7f3a\u70b9：\u5185\u5b58\u788e\u7247\u591a，\u6307\u9488\u5360\u636e\u989d\u5916\u7a7a\u95f4\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
                                                                                                    2.qiucklist\u7684\u4f18\u52bf<\/h5>\n

                                                                                                    \u200b \u4fdd\u7559ziplist\u7684\u5185\u5b58\u7d27\u51d1\u4f18\u52bf，\u540c\u65f6\u9650\u5236ziplist\u5927\u5c0f，\u5c06\u591a\u4e2aziplist\u901a\u8fc7\u53cc\u5411\u94fe\u8868\u8fde\u63a5，\u907f\u514d\u4e86\u5355\u4e2aziplist\u5728\u5927\u89c4\u6a21\u6570\u636e\u4e0b\u5185\u5b58\u91cd\u5206\u914d\u5e26\u6765\u7684\u6027\u80fd\u5dee\u7684\u5f0a\u7aef\u3002<\/p>\n

                                                                                                    \u4e8c\u3001quicklist\u7684\u7ed3\u6784<\/h4>\n

                                                                                                    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

                                                                                                    \u4e3a\u4e86\u907f\u514dQuickList\u4e2d\u7684\u6bcf\u4e2aZipList\u4e2dentry\u8fc7\u591a，Redis\u63d0\u4f9b\u4e86\u4e00\u4e2a\u914d\u7f6e\u9879：list-max-ziplist-size\u6765\u9650\u5236\u3002 \u5982\u679c\u503c\u4e3a\u6b63，\u5219\u4ee3\u8868ZipList\u7684\u5141\u8bb8\u7684entry\u4e2a\u6570\u7684\u6700\u5927\u503c \u5982\u679c\u503c\u4e3a\u8d1f，\u5219\u4ee3\u8868ZipList\u7684\u6700\u5927\u5185\u5b58\u5927\u5c0f，\u52065\u79cd\u60c5\u51b5：<\/p>\n

                                                                                                      \n
                                                                                                    • -1：\u6bcf\u4e2aZipList\u7684\u5185\u5b58\u5360\u7528\u4e0d\u80fd\u8d85\u8fc74kb<\/li>\n
                                                                                                    • -2：\u6bcf\u4e2aZipList\u7684\u5185\u5b58\u5360\u7528\u4e0d\u80fd\u8d85\u8fc78kb<\/li>\n
                                                                                                    • -3：\u6bcf\u4e2aZipList\u7684\u5185\u5b58\u5360\u7528\u4e0d\u80fd\u8d85\u8fc716kb<\/li>\n
                                                                                                    • -4：\u6bcf\u4e2aZipList\u7684\u5185\u5b58\u5360\u7528\u4e0d\u80fd\u8d85\u8fc732kb<\/li>\n
                                                                                                    • -5：\u6bcf\u4e2aZipList\u7684\u5185\u5b58\u5360\u7528\u4e0d\u80fd\u8d85\u8fc764kb<\/li>\n<\/ul>\n

                                                                                                      \u5176\u9ed8\u8ba4\u503c\u4e3a -2<\/p>\n

                                                                                                      \u4e09\u3001quicklist \u7684\u6838\u5fc3\u673a\u5236<\/h4>\n

                                                                                                      1. \u52a8\u6001\u8282\u70b9\u7ba1\u7406<\/h5>\n
                                                                                                        \n
                                                                                                      • \u8282\u70b9\u5206\u88c2：\u5f53\u63d2\u5165\u5143\u7d20\u5bfc\u81f4\u5355\u4e2a ziplist \u8d85\u8fc7 fill \u9608\u503c\u65f6，\u5206\u88c2\u4e3a\u4e24\u4e2a\u8282\u70b9\u3002<\/li>\n
                                                                                                      • \u8282\u70b9\u5408\u5e76：\u5f53\u5220\u9664\u5143\u7d20\u5bfc\u81f4\u76f8\u90bb\u8282\u70b9\u5bb9\u91cf\u8fc7\u5c0f\u65f6，\u5408\u5e76\u4ee5\u51cf\u5c11\u5185\u5b58\u788e\u7247\u3002<\/li>\n<\/ul>\n
                                                                                                        2. \u538b\u7f29\u4f18\u5316<\/h5>\n
                                                                                                          \n
                                                                                                        • LZF \u538b\u7f29\u7b97\u6cd5：\u5bf9\u4e2d\u95f4\u8282\u70b9\u8fdb\u884c\u538b\u7f29（compress \u53c2\u6570\u63a7\u5236\u538b\u7f29\u6df1\u5ea6）\u3002\n
                                                                                                            \n
                                                                                                          • \u538b\u7f29\u6df1\u5ea6\u4e3a 0：\u4e0d\u538b\u7f29\u3002<\/li>\n
                                                                                                          • \u538b\u7f29\u6df1\u5ea6\u4e3a 1：\u5934\u5c3e\u5404\u4fdd\u7559 1 \u4e2a\u8282\u70b9\u4e0d\u538b\u7f29，\u5176\u4f59\u538b\u7f29\u3002<\/li>\n
                                                                                                          • \u538b\u7f29\u6df1\u5ea6\u4e3a 2：\u5934\u5c3e\u5404\u4fdd\u7559 2 \u4e2a\u8282\u70b9\u4e0d\u538b\u7f29，\u5176\u4f59\u538b\u7f29\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

                                                                                                            SkipList<\/h3>\n

                                                                                                            \u4e00\u3001\u8df3\u8868\u7684\u6838\u5fc3\u8bbe\u8ba1<\/h4>\n

                                                                                                            1. \u57fa\u672c\u6982\u5ff5<\/h5>\n

                                                                                                            \u8df3\u8868\u901a\u8fc7 \u591a\u5c42\u94fe\u8868 \u5b9e\u73b0\u6709\u5e8f\u6570\u636e\u7684\u5feb\u901f\u8bbf\u95ee\u3002\u6bcf\u4e2a\u8282\u70b9\u5305\u542b\u591a\u4e2a \u5c42\u7ea7，\u6bcf\u5c42\u7ef4\u62a4\u4e00\u4e2a\u6307\u5411\u540e\u7eed\u8282\u70b9\u7684\u6307\u9488，\u9ad8\u5c42\u6307\u9488\u53ef\u8de8\u8d8a\u591a\u4e2a\u4f4e\u5c42\u8282\u70b9，\u4ece\u800c\u52a0\u901f\u67e5\u627e\u3002<\/p>\n

                                                                                                            2. \u8282\u70b9\u7ed3\u6784<\/h5>\n

                                                                                                            \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

                                                                                                            3. \u5c42\u6570\u751f\u6210\u89c4\u5219<\/h5>\n
                                                                                                              \n
                                                                                                            • \u5e42\u6b21\u5b9a\u5f8b：\u65b0\u8282\u70b9\u7684\u5c42\u6570\u968f\u673a\u751f\u6210，\u6982\u7387\u9010\u5c42\u51cf\u534a\u3002\n
                                                                                                                \n
                                                                                                              • \u7b2c 1 \u5c42\u6982\u7387：100%<\/li>\n
                                                                                                              • \u7b2c 2 \u5c42\u6982\u7387：50%<\/li>\n
                                                                                                              • \u7b2c 3 \u5c42\u6982\u7387：25%<\/li>\n
                                                                                                              • \u2026<\/li>\n
                                                                                                              • \u6700\u5927\u5c42\u6570：ZSKIPLIST_MAXLEVEL = 32（Redis \u9ed8\u8ba4\u9650\u5236）<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

                                                                                                                \u4e8c\u3001\u8df3\u8868\u7684\u64cd\u4f5c\u673a\u5236<\/h4>\n

                                                                                                                1. \u67e5\u627e\u64cd\u4f5c<\/h5>\n
                                                                                                                  \n
                                                                                                                • \u4ece\u6700\u9ad8\u5c42\u5f00\u59cb：\u9010\u5c42\u904d\u5386，\u82e5\u5f53\u524d\u5c42\u7684\u4e0b\u4e2a\u8282\u70b9\u5206\u503c\u5927\u4e8e\u76ee\u6807\u503c，\u5219\u4e0b\u964d\u4e00\u5c42\u7ee7\u7eed\u67e5\u627e\u3002<\/li>\n
                                                                                                                • \u65f6\u95f4\u590d\u6742\u5ea6：\u5e73\u5747 O(log n)，\u6700\u574f O(n)\u3002<\/li>\n<\/ul>\n
                                                                                                                  2. \u63d2\u5165\u64cd\u4f5c<\/h5>\n
                                                                                                                • \u786e\u5b9a\u63d2\u5165\u4f4d\u7f6e：\u67e5\u627e\u8fc7\u7a0b\u4e2d\u8bb0\u5f55\u6bcf\u5c42\u7684\u524d\u9a71\u8282\u70b9\u3002<\/li>\n
                                                                                                                • \u751f\u6210\u968f\u673a\u5c42\u6570：\u6839\u636e\u5e42\u6b21\u5b9a\u5f8b\u786e\u5b9a\u65b0\u8282\u70b9\u5c42\u6570\u3002<\/li>\n
                                                                                                                • \u8c03\u6574\u6307\u9488：\u5c06\u65b0\u8282\u70b9\u63d2\u5165\u5404\u5c42\u94fe\u8868，\u66f4\u65b0\u524d\u540e\u8282\u70b9\u7684\u6307\u9488\u548c\u8de8\u5ea6\u3002<\/li>\n
                                                                                                                  3. \u5220\u9664\u64cd\u4f5c<\/h5>\n
                                                                                                                • \u5b9a\u4f4d\u8282\u70b9：\u67e5\u627e\u76ee\u6807\u8282\u70b9，\u5e76\u8bb0\u5f55\u5404\u5c42\u524d\u9a71\u8282\u70b9\u3002<\/li>\n
                                                                                                                • \u66f4\u65b0\u6307\u9488：\u5c06\u524d\u9a71\u8282\u70b9\u7684\u6307\u9488\u6307\u5411\u76ee\u6807\u8282\u70b9\u7684\u540e\u7ee7\u8282\u70b9\u3002<\/li>\n
                                                                                                                • \u91ca\u653e\u5185\u5b58：\u82e5\u8282\u70b9\u65e0\u5176\u4ed6\u5f15\u7528，\u91ca\u653e\u5185\u5b58\u3002<\/li>\n

                                                                                                                  RedisObject<\/h3>\n

                                                                                                                  Redis \u7684 redisObject \u662f\u7ba1\u7406\u6240\u6709\u6570\u636e\u7c7b\u578b（\u5982\u5b57\u7b26\u4e32\u3001\u5217\u8868\u3001\u54c8\u5e0c\u7b49）\u7684\u6838\u5fc3\u7ed3\u6784，\u5b83\u901a\u8fc7\u7edf\u4e00\u7684\u63a5\u53e3\u62bd\u8c61，\u5b9e\u73b0\u4e86\u5185\u5b58\u4f18\u5316\u3001\u7f16\u7801\u8f6c\u6362\u7b49\u64cd\u4f5c\u3002<\/p>\n

                                                                                                                  \u4e00\u3001redisObject \u7684\u7ed3\u6784\u5b9a\u4e49<\/h4>\n

                                                                                                                  \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

                                                                                                                  \u4e8c\u3001\u6838\u5fc3\u5b57\u6bb5\u8be6\u89e3<\/h4>\n

                                                                                                                  1. \u6570\u636e\u7c7b\u578b（type）<\/h5>\n

                                                                                                                  Redis \u652f\u6301 5 \u79cd\u57fa\u7840\u6570\u636e\u7c7b\u578b，\u7531 type \u6807\u8bc6：<\/p>\n

                                                                                                                    \n
                                                                                                                  • OBJ_STRING：\u5b57\u7b26\u4e32（\u7b80\u5355\u503c\u3001\u8ba1\u6570\u5668\u3001\u4e8c\u8fdb\u5236\u6570\u636e）\u3002<\/li>\n
                                                                                                                  • OBJ_LIST：\u5217\u8868（\u961f\u5217\u3001\u6808\u3001\u963b\u585e\u961f\u5217）\u3002<\/li>\n
                                                                                                                  • OBJ_HASH：\u54c8\u5e0c（\u5bf9\u8c61\u5c5e\u6027\u5b58\u50a8）\u3002<\/li>\n
                                                                                                                  • OBJ_SET：\u96c6\u5408（\u552f\u4e00\u6027\u96c6\u5408\u3001\u4ea4\u5e76\u5dee\u8fd0\u7b97）\u3002<\/li>\n
                                                                                                                  • OBJ_ZSET：\u6709\u5e8f\u96c6\u5408（\u6392\u884c\u699c\u3001\u8303\u56f4\u67e5\u8be2）\u3002<\/li>\n<\/ul>\n
                                                                                                                    2. \u7f16\u7801\u65b9\u5f0f（encoding）<\/h5>\n

                                                                                                                    \u540c\u4e00\u6570\u636e\u7c7b\u578b\u53ef\u5bf9\u5e94\u591a\u79cd\u5e95\u5c42\u7f16\u7801，Redis \u6839\u636e\u6570\u636e\u7279\u5f81\u81ea\u52a8\u9009\u62e9\u6700\u4f18\u7f16\u7801：<\/p>\n\n\u6570\u636e\u7c7b\u578b\u7f16\u7801\u65b9\u5f0f（encoding）\u5e95\u5c42\u7ed3\u6784\u9002\u7528\u573a\u666f<\/tr>\n\n\n\n\n\n\n\n\n\n\n\n
                                                                                                                    \u5b57\u7b26\u4e32<\/td>\nOBJ_ENCODING_INT<\/td>\n\u6574\u6570\u76f4\u63a5\u5b58\u50a8<\/td>\n\u503c\u4e3a\u6574\u6570（\u5982 SET key 42）<\/td>\n<\/tr>\n
                                                                                                                    <\/td>\nOBJ_ENCODING_EMBSTR<\/td>\nembstr \u683c\u5f0f SDS<\/td>\n\u77ed\u5b57\u7b26\u4e32（\u226444\u5b57\u8282）<\/td>\n<\/tr>\n
                                                                                                                    <\/td>\nOBJ_ENCODING_RAW<\/td>\nSDS \u52a8\u6001\u5b57\u7b26\u4e32<\/td>\n\u957f\u5b57\u7b26\u4e32\u6216\u4e8c\u8fdb\u5236\u6570\u636e<\/td>\n<\/tr>\n
                                                                                                                    \u5217\u8868<\/td>\nOBJ_ENCODING_QUICKLIST<\/td>\n\u5feb\u901f\u5217\u8868（\u5206\u6bb5 ziplist）<\/td>\n\u9ed8\u8ba4\u5b9e\u73b0（Redis 3.2+）<\/td>\n<\/tr>\n
                                                                                                                    \u54c8\u5e0c<\/td>\nOBJ_ENCODING_ZIPLIST<\/td>\n\u538b\u7f29\u5217\u8868（ziplist）<\/td>\n\u5b57\u6bb5\u5c11\u4e14\u503c\u5c0f（\u914d\u7f6e\u9608\u503c\u5185）<\/td>\n<\/tr>\n
                                                                                                                    <\/td>\nOBJ_ENCODING_HT<\/td>\n\u54c8\u5e0c\u8868（dict）<\/td>\n\u5b57\u6bb5\u591a\u6216\u503c\u5927<\/td>\n<\/tr>\n
                                                                                                                    \u96c6\u5408<\/td>\nOBJ_ENCODING_INTSET<\/td>\n\u6574\u6570\u96c6\u5408（intset）<\/td>\n\u5143\u7d20\u5168\u4e3a\u6574\u6570\u4e14\u6570\u91cf\u5c11<\/td>\n<\/tr>\n
                                                                                                                    <\/td>\nOBJ_ENCODING_HT<\/td>\n\u54c8\u5e0c\u8868（dict）<\/td>\n\u5143\u7d20\u542b\u975e\u6574\u6570\u6216\u6570\u91cf\u8d85\u9650<\/td>\n<\/tr>\n
                                                                                                                    \u6709\u5e8f\u96c6\u5408<\/td>\nOBJ_ENCODING_ZIPLIST<\/td>\n\u538b\u7f29\u5217\u8868（ziplist）<\/td>\n\u5143\u7d20\u5c11\u4e14\u503c\u5c0f（\u914d\u7f6e\u9608\u503c\u5185）<\/td>\n<\/tr>\n
                                                                                                                    <\/td>\nOBJ_ENCODING_SKIPLIST<\/td>\n\u8df3\u8dc3\u8868 + \u54c8\u5e0c\u8868（\u7ec4\u5408\u7ed3\u6784）<\/td>\n\u5143\u7d20\u591a\u6216\u503c\u5927<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

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