{"id":201199,"date":"2025-05-10T09:31:27","date_gmt":"2025-05-10T01:31:27","guid":{"rendered":"https:\/\/server.hk\/cnblog\/201199\/"},"modified":"2025-05-10T09:31:27","modified_gmt":"2025-05-10T01:31:27","slug":"redis%e4%b8%ad%e4%b8%80%e4%b8%aastring%e7%b1%bb%e5%9e%8b%e5%bc%95%e5%8f%91%e7%9a%84%e6%83%a8%e6%a1%88","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/201199\/","title":{"rendered":"Redis\u4e2d\u4e00\u4e2aString\u7c7b\u578b\u5f15\u53d1\u7684\u60e8\u6848"},"content":{"rendered":"

<\/b> <\/p>\n

Redis\u4e2d\u4e00\u4e2aString\u7c7b\u578b\u5f15\u53d1\u7684\u60e8\u6848<\/h1>\n

<\/i>\u6536\u85cf<\/span> <\/p>\n

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String\u7c7b\u578b\u7684\u6570\u636e\u7ed3\u6784<\/h2>\n

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<\/p>\n

    \n
  • len\uff1a4\u4e2a\u5b57\u8282\uff0c\u8868\u793abuf\u7684\u5df2\u7528\u957f\u5ea6\u3002<\/li>\n
  • alloc\uff1a4\u4e2a\u5b57\u8282\uff0c\u8868\u793abuf\u5206\u914d\u7684\u957f\u5ea6\uff0c\u4e00\u822c\u5927\u4e8elen\u3002<\/li>\n
  • buf\uff1a\u5b57\u8282\u6570\u7ec4\uff0c\u4fdd\u5b58\u5b9e\u9645\u6570\u636e\u3002\u4e3a\u4e86\u8868\u793a\u6570\u7ec4\u7684\u7ed3\u5c3e\uff0cRedis\u4f1a\u81ea\u52a8\u5728\u6570\u7ec4\u6700\u540e\u6dfb\u52a0\u4e00\u4e2a\u201d\\0″\u3002<\/li>\n<\/ul>\n

    \u53ef\u4ee5\u770b\u5230\uff0c\u5728SDS\u7ed3\u6784\u4f53\u4e2d\uff0c\u9664\u4e86\u6709\u4fdd\u5b58\u5b9e\u9645\u6570\u636e\u7684buf\uff0c\u8fd8\u6709len\u548calloc\u7684\u989d\u5916\u5143\u6570\u636e\u7684\u5f00\u9500\u3002\u53e6\u5916\u5bf9\u4e8eString\u7c7b\u578b\u6765\u8bf4\uff0c\u9664\u4e86SDS\u7684\u989d\u5916\u5f00\u9500\u5916\uff0c\u8fd8\u6709\u4e00\u4e2a\u53eb\u505aRedisObject\u7ed3\u6784\u4f53\u7684\u5f00\u9500\u3002\u56e0\u4e3aRedis\u7684\u6570\u636e\u7c7b\u578b\u6709\u5f88\u591a\uff0c\u4e0d\u540c\u7684\u6570\u636e\u7c7b\u578b\u90fd\u6709\u76f8\u540c\u7684\u5143\u6570\u636e\u8981\u8bb0\u5f55\uff08\u4f8b\u5982\u6700\u540e\u4e00\u6b21\u8bbf\u95ee\u65f6\u95f4\uff09\uff0c\u6240\u4ee5Redis\u4f1a\u91c7\u7528\u4e00\u4e2a\u53eb\u505aRedisObject\u7ed3\u6784\u4f53\u6765\u7edf\u4e00\u8bb0\u5f55\u8fd9\u4e9b\u5143\u6570\u636e\u3002\u4e00\u4e2aRedisObject\u5305\u542b\u4e86\u4e00\u4e2a8\u5b57\u8282\u7684\u5143\u6570\u636e\u548c\u4e00\u4e2a8\u5b57\u8282\u7684\u6307\u9488\uff0c\u8fd9\u4e2a\u6307\u9488\u6307\u5411\u5177\u4f53\u6570\u636e\u6240\u5728\uff0c\u4f8b\u5982String\u7c7b\u578b\u7684SDS\u7ed3\u6784\u4f53\u6240\u5728\u7684\u5185\u5b58\u5730\u5740\u3002\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n

    <\/p>\n

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    RedisObject \u5e03\u5c40\u5728\u4e00\u8d77\u4e86\uff0c\u800c\u662f\u4f1a\u7ed9 SDS \u5206\u914d\u72ec\u7acb\u7684\u7a7a\u95f4\uff0c\u5e76\u7528\u6307\u9488\u6307\u5411 SDS \u7ed3\u6784\u3002\u8fd9\u79cd\u5e03\u5c40\u65b9\u5f0f\u88ab\u79f0\u4e3a raw \u7f16\u7801\u6a21\u5f0f\u3002\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n

    <\/p>\n

    \u73b0\u5728\u6211\u4eec\u6765\u8ba1\u7b97\u4e00\u4e0b\u4e00\u5bf9\u56fe\u7247ID\u548c\u56fe\u7247\u5b58\u50a8\u5bf9\u8c61ID\u7684\u5185\u5b58\u7684\u4f7f\u7528\u91cf\u3002\u7531\u4e8e10\u4f4d\u6570\u7684\u56fe\u7247ID\u548c\u56fe\u7247\u5b58\u50a8\u5bf9\u8c61ID\u662fLong\u7c7b\u578b\u6574\u6570\uff0c\u6240\u4ee5\u53ef\u4ee5\u76f4\u63a5\u7528int\u7f16\u7801\u7684RedisObject\u4fdd\u5b58\u3002\u76f8\u5bf9\u5e94\u7684RedisObject\u5143\u6570\u636e\u90e8\u5206\u53608\u5b57\u8282\uff0c\u6307\u9488\u90e8\u5206\u88ab\u76f4\u63a5\u8d4b\u503c\u4e3a8\u5b57\u8282\u7684\u6574\u6570\u4e86\u3002\u6b64\u65f6\uff0c\u6bcf\u4e2aID\u4f1a\u4f7f\u752816\u5b57\u8282\uff0c\u52a0\u8d77\u6765\u4e00\u5171\u662f32\u5b57\u8282\u3002\u4f46\u662f\uff0c\u53e6\u5916\u7684 32 \u5b57\u8282\u53bb\u54ea\u513f\u4e86\u5462\uff1f<\/p>\n

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    <\/p>\n

    \u7531\u4e8eRedis\u4f7f\u7528\u7684\u5185\u5b58\u5206\u914d\u5e93\u4e3ajemalloc\uff0cjemalloc\u5728\u5206\u914d\u5185\u5b58\u65f6\uff0c\u4f1a\u6839\u636e\u7533\u8bf7\u7684\u5b57\u8282\u6570N\uff0c\u627e\u4e00\u4e2a\u6bd4N\u5927\u7684\uff0c\u6700\u63a5\u8fd1N\u76842\u7684\u5e42\u6b21\u6570\u4f5c\u4e3a\u5206\u914d\u7684\u7a7a\u95f4\u3002<\/p>\n

    \u6240\u4ee5\u7533\u8bf7\u4e00\u4e2a24\u5b57\u8282\u7684dictEntity\uff0c\u5b9e\u9645\u4f1a\u5206\u914d32\u4e2a\u5b57\u8282\u3002<\/p>\n

    \u5230\u76ee\u524d\u4f4d\u7f6e\uff0c\u4f60\u5e94\u8be5\u660e\u767d\u4e86\u4e3a\u4ec0\u4e48String\u7c7b\u578b\u6765\u4fdd\u5b58\u56fe\u7247ID\u548c\u56fe\u7247\u5b58\u50a8\u5bf9\u8c61ID\u4f1a\u5360\u752864\u4e2a\u5b57\u8282\u4e86\u3002\u4e00\u4e2a\u6709\u6548\u4fe1\u606f\u53ea\u670916\u4e2a\u5b57\u8282\uff0c\u5728\u4f7f\u7528String\u7c7b\u578b\u4fdd\u5b58\u65f6\uff0c\u5374\u8981\u5360\u752864\u4e2a\u5b57\u8282\u5185\u5b58\u7a7a\u95f4\uff0c\u670948\u4e2a\u5b57\u8282\u7528\u6765\u4fdd\u5b58\u5143\u6570\u636e\u4fe1\u606f\u4e86\uff0c\u8fd9\u662f\u4e0d\u662f\u6781\u5927\u7684\u6d6a\u8d39\u4e86\u5185\u5b58\u7a7a\u95f4\u3002\u90a3\u4e48\u6709\u6ca1\u6709\u66f4\u52a0\u8282\u7701\u5185\u5b58\u7684\u65b9\u6cd5\u5462\uff1f<\/p>\n

    \u7528\u538b\u7f29\u5217\u8868\u8282\u7701\u5185\u5b58<\/h2>\n

    Redis\u91cc\u6709\u4e00\u79cd\u53eb\u505a\u538b\u7f29\u5217\u8868\u7684\u7ed3\u6784\uff0c\u975e\u5e38\u8282\u7701\u5185\u5b58\u3002\u6211\u4eec\u5148\u56de\u987e\u4e00\u4e0b\u538b\u7f29\u5217\u8868\u7684\u6784\u6210\u3002\u8868\u5934\u6709\u4e09\u4e2a\u5b57\u6bb5zlbytes\u3001zllen\u548czltail\uff0c\u5206\u522b\u8868\u793a\u5217\u8868\u7684\u957f\u5ea6\u3001\u5217\u8868\u5c3e\u7684\u504f\u79fb\u91cf\u4ee5\u53ca\u5217\u8868\u4e2dentry\u7684\u4e2a\u6570\u3002\u538b\u7f29\u5217\u8868\u8868\u5c3e\u6709\u4e00\u4e2azlend\uff0c\u8868\u793a\u5217\u8868\u7ed3\u675f\u3002\u5982\u4e0b\u56fe\u6240\u793a\u3002<\/p>\n

    <\/p>\n

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      \n
    • pre_len\uff1a\u8868\u793a\u524d\u4e00\u4e2aentry\u7684\u957f\u5ea6\u3002prev_len\u6709\u4e24\u79cd\u53d6\u503c\u60c5\u51b5\uff1a1 \u5b57\u8282\u6216 5 \u5b57\u8282\u3002\u5f53\u4e0a\u4e00\u4e2a entry \u957f\u5ea6\u5c0f\u4e8e 254 \u5b57\u8282\u65f6\uff0cprev_len \u53d6\u503c\u4e3a 1 \u5b57\u8282\uff0c\u5426\u5219\uff0c\u5c31\u53d6\u503c\u4e3a 5 \u5b57\u8282\u3002<\/li>\n
    • len\uff1a\u8868\u793a\u81ea\u8eab\u7684\u957f\u5ea6\uff0c\u53604\u4e2a\u5b57\u8282\u3002<\/li>\n
    • encoding\uff1a\u8868\u793a\u7f16\u7801\u65b9\u5f0f\uff0c\u53601\u4e2a\u5b57\u8282\u3002<\/li>\n
    • content\uff1a\u4fdd\u5b58\u5b9e\u9645\u6570\u636e\u3002<\/li>\n<\/ul>\n

      \u5047\u8bbe\u6211\u4eec\u4f7f\u7528entry\u6765\u4fdd\u5b58\u56fe\u7247\u5b58\u50a8\u5bf9\u8c61ID(\u53608\u4e2a\u5b57\u8282)\uff0c\u6b64\u65f6\uff0c\u6bcf\u4e2aentry\u7684prev_len\u5360\u75281\u4e2a\u5b57\u8282\u5c31\u884c\uff0c\u56e0\u4e3a\u6bcf\u4e00\u4e2aentry\u7684\u524d\u4e00\u4e2aentry\u7684\u957f\u5ea6\u5c0f\u4e8e264\u5b57\u8282\u3002\u8fd9\u6837\u4e00\u6765\uff0c\u4e00\u4e2a\u56fe\u7247\u5bf9\u8c61ID\u6240\u5360\u7528\u7684\u5185\u5b58\u5927\u5c0f\u662f14\uff081+4+1+8\uff09\u4e2a\u5b57\u8282\uff0c\u5b9e\u9645\u4e0a\u4f1a\u5206\u914d16\u4e2a\u5b57\u8282\u3002<\/p>\n

      Redis\u91cc\u57fa\u4e8e\u538b\u7f29\u5217\u8868\u5b9e\u73b0\u4e86List\u3001Hash\u548cSorted Set\u96c6\u5408\u7c7b\u578b\uff0c\u8fd9\u6837\u505a\u7684\u6700\u5927\u597d\u5904\u5c31\u662f\u8282\u7701\u4e86dictEntity\u7684\u5185\u5b58\u5f00\u9500\u3002\u5bf9\u4e8eString\u7c7b\u578b\u6765\u8bf4\uff0c\u4e00\u4e2a\u952e\u503c\u5bf9\u5c31\u6709\u4e00\u4e2adictEntity\uff0c\u5360\u752832\u4e2a\u5b57\u8282\u3002\u5bf9\u4e8e\u96c6\u5408\u7c7b\u578b\u6765\u8bf4\uff0c\u4e00\u4e2akey\u5bf9\u5e94\u4e86\u5f88\u591a\u6570\u636e\uff0c\u5374\u53ea\u662f\u5360\u7528\u4e86\u4e00\u4e2adictEntity\uff0c\u8fd9\u6837\u5c31\u8282\u7701\u4e86\u5185\u5b58\u7a7a\u95f4\u3002<\/p>\n

      \u5982\u4f55\u7528\u96c6\u5408\u7c7b\u578b\u5b58\u50a8\u5355\u503c\u7684\u952e\u503c\u5bf9\u7684\u6570\u636e
      <\/h2>\n

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        \n
      • hash-max-ziplist-entries\uff1a\u8868\u793a\u7528\u538b\u7f29\u5217\u8868\u4fdd\u5b58\u65f6\u54c8\u5e0c\u96c6\u5408\u4e2d\u7684\u6700\u5927\u5143\u7d20\u4e2a\u6570\u3002<\/li>\n
      • hash-max-ziplist-value\uff1a\u8868\u793a\u7528\u538b\u7f29\u5217\u8868\u4fdd\u5b58\u65f6\u54c8\u5e0c\u96c6\u5408\u4e2d\u5355\u4e2a\u5143\u7d20\u7684\u6700\u5927\u957f\u5ea6\u3002<\/li>\n<\/ul>\n

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        Redis\u4e2d\u4e00\u4e2aString\u7c7b\u578b...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-201199","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201199","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=201199"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201199\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=201199"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=201199"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=201199"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}