{"id":700,"date":"2026-03-16T11:38:23","date_gmt":"2026-03-16T03:38:23","guid":{"rendered":"https:\/\/forelink.top\/?p=700"},"modified":"2026-03-16T11:39:13","modified_gmt":"2026-03-16T03:39:13","slug":"%e4%bf%a1%e9%a9%ac%e7%94%b1%e7%bc%b0%ef%bc%8c%e7%bc%93%e5%ad%98%e6%89%93%e6%bb%a1%e4%bd%bf%e5%8a%b2%e9%80%a0","status":"publish","type":"post","link":"https:\/\/forelink.top\/index.php\/2026\/03\/16\/%e4%bf%a1%e9%a9%ac%e7%94%b1%e7%bc%b0%ef%bc%8c%e7%bc%93%e5%ad%98%e6%89%93%e6%bb%a1%e4%bd%bf%e5%8a%b2%e9%80%a0\/","title":{"rendered":"\u4fe1\u9a6c\u7531\u7f30\uff0c\u7f13\u5b58\u5c31\u8ba9\u5b83\u6253\u6ee1"},"content":{"rendered":"\n

\u4e00\u5929\u591c\u91cc<\/h1>\n\n\n\n

\u51cc\u6668\u4e09\u70b9\uff0c\u544a\u8b66\u94c3\u58f0\u523a\u8033\u7684\u54cd\u8d77\uff0c\u8fd0\u7ef4\u7fa4\u4e0a\u5f39\u51faRedis\u5bb9\u91cf\u4e0a\u9650\u8b66\u544a\u2014\u2014\u4f7f\u7528\u7387\u5df2\u8fbe75%\uff0c\u5373\u5c06\u89e6\u9876\u3002<\/p>\n\n\n\n

\u8fd8\u5728\u82e6\u82e6\u7ed9\u9700\u6c42debug\u7684oncall\u540c\u5b66\u5c0f\u738b\u63c9\u4e86\u63c9\u60fa\u5fea\u7684\u53cc\u773c\uff0c\u770b\u5230\u8fd9\u6761\u544a\u8b66\uff0c\u5fc3\u91cc\u4e00\u7d27\uff1a”\u7cdf\u4e86\uff0c\u7f13\u5b58\u8981\u7206\u4e86\uff01”\u3002\u4e8c\u8bdd\u4e0d\u8bf4\uff0c\u719f\u7ec3\u7684\u6253\u5f00\u8fd0\u7ef4\u5e73\u53f0\uff0c\u556a\u5693\u556a\u64e6\u4e00\u987f\u64cd\u4f5c\uff0c\u628aredis\u7ed9\u6269\u5bb9\u4e86\u4e00\u500d\u3002<\/p>\n\n\n\n

\u770b\u7740\u544a\u8b66\u7ec8\u4e8e\u6d88\u505c\u4e0b\u6765\uff0c\u5c0f\u738b\u957f\u8212\u4e00\u53e3\u6c14\uff1a”\u641e\u5b9a\uff0c\u6536\u5de5\uff01”<\/p>\n\n\n\n

\u6b8a\u4e0d\u77e5\u6269\u5bb9\u5e26\u6765\u7684\u7ffb\u500d\u6210\u672c\u9886\u5bfc\u90fd\u770b\u5728\u773c\u91cc\uff0c\u5728\u7b2c\u4e8c\u5468\u590d\u76d8\u7684\u65f6\u5019\uff0c\u5c0f\u738b\u88ab\u9886\u5bfc\u53eb\u53bb”\u559d\u8336”\u2026<\/p>\n\n\n\n

\u6269\u5bb9\u53ea\u662f\u62d6\u5ef6\uff0c\u5185\u5b58\u5f88\u6602\u8d35<\/h1>\n\n\n\n

\u5728\u5185\u5b58\u6761\u6da8\u4ef7500%\u76842025\uff0c\u53ea\u80fd\u7948\u7977\u5b83\u4e0d\u4f1a\u5728\u8fd9\u51e0\u5e74\u574f\u6389\u3002\u3002\u3002<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u5728\u521a\u521a\u7684\u573a\u666f\u4e2d\uff0credis\u5feb\u8981\u5230\u4e0a\u9650\uff0c\u5982\u679c\u9009\u62e9\u6269\u5bb9\uff0c\u7ed3\u679c\u5c31\u662f\u52a0\u4e86\u4e00\u5927\u5806\u5185\u5b58\u3002\u7b49\u5230\u9ad8\u5cf0\u671f\u8fc7\u4e86\uff0c\u4f7f\u7528\u7387\u53c8\u5c34\u5c2c\u7684\u4f4e\u3002<\/p>\n\n\n\n

\u5bb9\u91cf\u53ea\u662f\u8868\u8c61\uff0c\u5982\u679c\u6269\u5bb9\u9891\u7e41\uff0c\u8bf4\u660e\u7f13\u5b58\u7684\u4f7f\u7528\u59ff\u52bf\u6709\u95ee\u9898\uff0c\u65e0\u8111\u7684\u6269\u5bb9\u5e26\u6765\u4e86\u6210\u672c\u7684\u589e\u52a0\uff0c\u6700\u4e3a\u81f4\u547d\u7684\u662f\u63a9\u76d6\u4e86\u771f\u6b63\u7684\u95ee\u9898\u3002<\/p>\n\n\n\n

\u65e2\u7136\u5728\u4e1a\u52a1\u4e2d\u4f7f\u7528redis\u4f5c\u4e3a\u7f13\u5b58\uff0c\u5c31\u662f\u5e0c\u671b\u80fd\u7528”\u7a7a\u95f4\u6362\u65f6\u95f4”\uff0c\u6240\u4ee5\u9ad8\u547d\u4e2d\u7387\u662f\u76f8\u5f53\u91cd\u8981\u7684\u3002\u540c\u65f6\u6211\u4eec\u5e0c\u671b\u65e2\u7136redis\u96c6\u7fa4\u6709\u8fd9\u4e48\u591a\u5185\u5b58\uff0c\u5c31\u5c06\u6bcf\u4e00byte\u7684\u7a7a\u95f4\u90fd\u5c3d\u91cf\u7684\u5229\u7528\u4e0a\u3002<\/p>\n\n\n\n

\u4f46\u73b0\u5b9e\u5f80\u5f80\u662f\u9aa8\u611f\u7684\u2014\u2014\u5f88\u591a\u4e1a\u52a1\u7531\u4e8e\u5386\u53f2\u539f\u56e0\u6216\u8005\u8bbe\u8ba1\u4e0d\u5f53\uff0c\u7f13\u5b58\u91cc\u5806\u780c\u4e86\u5927\u91cf”\u51b7\u6570\u636e”\uff0c\u5360\u7740\u8305\u5751\u4e0d\u62c9\u5c4e\u3002\u8fd9\u4e9b\u6570\u636e\u8981\u4e48\u662f\u5386\u53f2\u9057\u7559\u7684\u810f\u6570\u636e\uff0c\u8981\u4e48\u662f\u88ab\u4e00\u6b21\u6027\u67e5\u8be2\u540e\u518d\u4e5f\u65e0\u4eba\u95ee\u6d25\u7684”\u50f5\u5c38key”\u3002\u5b83\u4eec\u5c31\u50cf\u4f60\u5bb6\u91cc\u90a3\u4e9b\u4e70\u56de\u6765\u53ea\u7528\u4e86\u4e00\u6b21\u7684\u5bb6\u7535\uff0c\u5360\u5730\u65b9\uff0c\u5403\u7070\u6ca1\u5546\u91cf\u3002\u66f4\u8981\u547d\u7684\u662f\uff0c\u8fd9\u4e9b\u51b7\u6570\u636e\u4f1a\u628a\u70ed\u70b9\u6570\u636e\u6324\u51fa\u53bb\uff0c\u5bfc\u81f4\u7f13\u5b58\u547d\u4e2d\u7387\u4e0b\u964d\uff0c\u95f4\u63a5\u903c\u5f97\u4f60\u7ee7\u7eed\u6269\u5bb9\u2014\u2014\u5f62\u6210\u6076\u6027\u5faa\u73af\u3002<\/p>\n\n\n\n

\u6240\u4ee5\u771f\u6b63\u7684\u95ee\u9898\u4e0d\u662f”\u7f13\u5b58\u5feb\u6ee1\u4e86\u8981\u6269\u5bb9”\uff0c\u800c\u662f”\u7f13\u5b58\u91cc\u5230\u5e95\u88c5\u4e86\u4ec0\u4e48\u6709\u7528\u7684\u4e1c\u897f”\u3002\u4e0e\u5176\u50bb\u50bb\u7684\u52a0\u5185\u5b58\uff0c\u4e0d\u5982\u5148\u770b\u770b\u80fd\u4e0d\u80fd\u628a\u90a3\u4e9b\u5360\u7740\u7a7a\u95f4\u5374\u6ca1\u4eba\u7528\u7684\u6570\u636e\u6e05\u7406\u6389\uff0c\u8ba9\u771f\u6b63\u70ed\u7684\u6570\u636e\u6709\u5bb9\u8eab\u4e4b\u5904\u3002<\/p>\n\n\n\n

\u5185\u5b58\u6dd8\u6c70\u7b97\u6cd5<\/h1>\n\n\n\n

LRU\uff0c\u5fd8\u8bb0\u6700\u4e45\u7684\u5148\u8d70<\/h2>\n\n\n\n

LRU\uff08Least Recently Used\uff0c\u6700\u8fd1\u6700\u5c11\u4f7f\u7528\uff09\u662f\u4e00\u79cd\u7ecf\u5178\u7684\u7f13\u5b58\u6dd8\u6c70\u7b56\u7565\u3002\u5b83\u7684\u6838\u5fc3\u601d\u60f3\u662f\uff1a\u6700\u8fd1\u88ab\u8bbf\u95ee\u8fc7\u7684\u6570\u636e\uff0c\u5728\u672a\u6765\u4e5f\u66f4\u53ef\u80fd\u88ab\u8bbf\u95ee<\/strong>\u3002\u56e0\u6b64\uff0c\u5f53\u7f13\u5b58\u7a7a\u95f4\u4e0d\u8db3\u65f6\uff0c\u5e94\u5f53\u4f18\u5148\u6dd8\u6c70\u90a3\u4e9b\u6700\u4e45\u672a\u88ab\u8bbf\u95ee\u7684\u6570\u636e\u3002<\/p>\n\n\n\n

\u4ece\u7b97\u6cd5\u5b9e\u73b0\u89d2\u5ea6\u6765\u770b\uff0cLRU\u9700\u8981\u7ef4\u62a4\u4e00\u4e2a\u6570\u636e\u8bbf\u95ee\u987a\u5e8f\u7684\u8bb0\u5f55\u3002\u6700\u76f4\u89c2\u7684\u505a\u6cd5\u662f\u4f7f\u7528\u53cc\u5411\u94fe\u8868\u914d\u5408\u54c8\u5e0c\u8868\uff1a\u6bcf\u6b21\u8bbf\u95ee\u6570\u636e\u65f6\uff0c\u5c06\u8be5\u6570\u636e\u79fb\u52a8\u5230\u94fe\u8868\u5934\u90e8\uff1b\u5f53\u9700\u8981\u6dd8\u6c70\u65f6\uff0c\u76f4\u63a5\u4ece\u94fe\u8868\u5c3e\u90e8\u79fb\u9664\u3002\u8fd9\u79cd\u5b9e\u73b0\u65b9\u5f0f\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(1)\uff0c\u4f46\u9700\u8981\u989d\u5916\u7684\u5185\u5b58\u6765\u7ef4\u62a4\u94fe\u8868\u7ed3\u6784\u3002<\/p>\n\n\n\n

LRU\u7684\u9002\u7528\u573a\u666f<\/strong>\uff1a\u9002\u7528\u4e8e\u6570\u636e\u8bbf\u95ee\u5177\u6709\u65f6\u95f4\u5c40\u90e8\u6027\u7684\u4e1a\u52a1\u2014\u2014\u5373\u70ed\u70b9\u6570\u636e\u96c6\u4e2d\u5728\u6700\u8fd1\u4e00\u6bb5\u65f6\u95f4\u5185\u9891\u7e41\u8bbf\u95ee\u7684\u573a\u666f\u3002\u4f8b\u5982\uff1a\u70ed\u70b9\u65b0\u95fb\u5217\u8868\u3001\u5b9e\u65f6\u884c\u60c5\u6570\u636e\u3001\u7528\u6237\u4f1a\u8bdd\u4fe1\u606f\u7b49\u3002\u8fd9\u7c7b\u573a\u666f\u7684\u7279\u70b9\u662f”\u98ce\u6c34\u8f6e\u6d41\u8f6c”\uff0c\u4eca\u5929\u7684\u70ed\u70b9\u53ef\u80fd\u660e\u5929\u5c31\u51b7\u4e86\u3002<\/p>\n\n\n\n

LRU\u7684\u5c40\u9650\u6027<\/strong>\uff1a\u5982\u679c\u67d0\u4e9b\u51b7\u95e8\u6570\u636e\u88ab\u610f\u5916\u8bbf\u95ee\u4e00\u6b21\uff0c\u5c31\u4f1a\u88ab\u6807\u8bb0\u4e3a”\u6700\u8fd1\u8bbf\u95ee”\u800c\u9003\u8131\u6dd8\u6c70\uff0c\u8fd9\u53ef\u80fd\u5bfc\u81f4\u771f\u6b63\u7684\u70ed\u70b9\u6570\u636e\u88ab\u6324\u51fa\u53bb\u3002\u53e6\u5916\uff0c\u5bf9\u4e8e\u626b\u63cf\u578b\u64cd\u4f5c\uff08\u5982\u5168\u8868\u67e5\u8be2\uff09\uff0cLRU\u53ef\u80fd\u4f1a\u6c61\u67d3\u7f13\u5b58\u3002<\/p>\n\n\n\n

\/\/ LRU \u5b9e\u73b0\uff1a\u53cc\u5411\u94fe\u8868 + \u54c8\u5e0c\u8868\n\/\/ \u65f6\u95f4\u590d\u6742\u5ea6\uff1aget\/put \u5747\u4e3a O(1)\nclass LRUCache {\n    private int capacity;              \/\/ \u7f13\u5b58\u5bb9\u91cf\n    private Map<Integer, Node> cache = new HashMap<>();  \/\/ \u54c8\u5e0c\u8868\uff1aO(1) \u67e5\u627e\n    private Node head = new Node();    \/\/ \u865a\u62df\u5934\u8282\u70b9\uff08\u6700\u8fd1\u4f7f\u7528\u7684\u5728\u5934\u90e8\uff09\n    private Node tail = new Node();    \/\/ \u865a\u62df\u5c3e\u8282\u70b9\uff08\u6700\u4e45\u672a\u4f7f\u7528\u7684\u5728\u5c3e\u90e8\uff09\n\n    public LRUCache(int capacity) {\n        this.capacity = capacity;\n        head.next = tail;\n        tail.prev = head;\n    }\n\n    public int get(int key) {\n        if (!cache.containsKey(key)) return -1;\n        Node node = cache.get(key);\n        moveToHead(node); \/\/ \u8bbf\u95ee\u540e\u79fb\u5230\u5934\u90e8\uff08\u6807\u8bb0\u4e3a\u6700\u8fd1\u4f7f\u7528\uff09\n        return node.value;\n    }\n\n    public void put(int key, int value) {\n        if (cache.containsKey(key)) {\n            Node node = cache.get(key);\n            node.value = value;\n            moveToHead(node);\n        } else {\n            Node newNode = new Node(key, value);\n            cache.put(key, newNode);\n            addToHead(newNode); \/\/ \u65b0\u8282\u70b9\u52a0\u5165\u5934\u90e8\n            if (cache.size() > capacity) {\n                Node tail = removeTail(); \/\/ \u8d85\u8fc7\u5bb9\u91cf\uff0c\u5220\u9664\u5c3e\u90e8\uff08\u6700\u4e45\u672a\u4f7f\u7528\uff09\n                cache.remove(tail.key);\n            }\n        }\n    }\n\n    \/\/ \u5c06\u8282\u70b9\u79fb\u52a8\u5230\u94fe\u8868\u5934\u90e8\n    private void moveToHead(Node node) {\n        removeNode(node);\n        addToHead(node);\n    }\n\n    \/\/ \u5728\u5934\u90e8\u6dfb\u52a0\u8282\u70b9\n    private void addToHead(Node node) {\n        node.prev = head;\n        node.next = head.next;\n        head.next.prev = node;\n        head.next = node;\n    }\n\n    \/\/ \u5220\u9664\u6307\u5b9a\u8282\u70b9\n    private void removeNode(Node node) {\n        node.prev.next = node.next;\n        node.next.prev = node.prev;\n    }\n\n    \/\/ \u5220\u9664\u5c3e\u90e8\u8282\u70b9\uff08\u6700\u4e45\u672a\u4f7f\u7528\uff09\n    private Node removeTail() {\n        Node node = tail.prev;\n        removeNode(node);\n        return node;\n    }\n\n    \/\/ \u53cc\u5411\u94fe\u8868\u8282\u70b9\n    class Node {\n        int key, value;\n        Node prev, next;\n        Node(int k, int v) { key = k; value = v; }\n        Node() {}\n    }\n}<\/code><\/pre>\n\n\n\n
LFU\uff0c\u6765\u7684\u6700\u9891\u7684\u7559\u4e0b<\/h2>\n\n\n\n
LFU\uff08Least Frequently Used\uff0c\u6700\u4e0d\u7ecf\u5e38\u4f7f\u7528\uff09\u4e0eLRU\u4e0d\u540c\uff0c\u5b83\u5173\u6ce8\u7684\u4e0d\u662f\u6570\u636e\u4f55\u65f6\u88ab\u8bbf\u95ee\uff0c\u800c\u662f\u6570\u636e\u88ab\u8bbf\u95ee\u7684\u9891\u6b21\u3002LFU\u7684\u6838\u5fc3\u5047\u8bbe\u662f\uff1a\u88ab\u8bbf\u95ee\u6b21\u6570\u8d8a\u591a\u7684\u6570\u636e\uff0c\u672a\u6765\u7ee7\u7eed\u88ab\u8bbf\u95ee\u7684\u53ef\u80fd\u6027\u8d8a\u5927<\/strong>\u3002\u56e0\u6b64\uff0c\u6dd8\u6c70\u65f6\u5e94\u5f53\u4f18\u5148\u6e05\u9664\u8bbf\u95ee\u9891\u7387\u6700\u4f4e\u7684\u6570\u636e\u3002<\/p>\n\n\n\n
\u4ece\u5b9e\u73b0\u89d2\u5ea6\uff0cLFU\u9700\u8981\u4e3a\u6bcf\u4e2a\u6570\u636e\u9879\u7ef4\u62a4\u4e00\u4e2a\u8bbf\u95ee\u8ba1\u6570\u5668\u3002\u4e00\u79cd\u5e38\u89c1\u7684\u5b9e\u73b0\u65b9\u5f0f\u662f\u4f7f\u7528\u6700\u5c0f\u5806\uff08Min Heap\uff09\u914d\u5408\u54c8\u5e0c\u8868\uff1a\u8bbf\u95ee\u8ba1\u6570\u5668\u6700\u5c0f\u7684\u6570\u636e\u4f4d\u4e8e\u5806\u9876\uff0c\u6dd8\u6c70\u65f6\u76f4\u63a5\u53d6\u51fa\u5806\u9876\u5143\u7d20\u5373\u53ef\u3002\u7ef4\u62a4\u5806\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(log n)\u3002<\/p>\n\n\n\n
LFU\u7684\u9002\u7528\u573a\u666f<\/strong>\uff1a\u9002\u7528\u4e8e\u8bbf\u95ee\u5206\u5e03\u9ad8\u5ea6\u4e0d\u5747\u5300\u7684\u4e1a\u52a1\u2014\u2014\u5373\u5b58\u5728\u660e\u663e\u7684”\u70ed\u95e8”\u548c”\u51b7\u95e8”\u6570\u636e\u3002\u4f8b\u5982\uff1a\u70ed\u95e8\u5546\u54c1\u63a8\u8350\u3001\u6392\u884c\u699c\u6570\u636e\u3001\u957f\u671f\u5360\u636e\u70ed\u641c\u7684\u8bdd\u9898\u7b49\u3002\u8fd9\u7c7b\u573a\u666f\u7684\u7279\u70b9\u662f”\u5f3a\u8005\u6052\u5f3a”\uff0c\u5934\u90e8\u6570\u636e\u7684\u8bbf\u95ee\u9891\u6b21\u8fdc\u8d85\u5176\u4ed6\u6570\u636e\u3002<\/p>\n\n\n\n
LFU\u7684\u5c40\u9650\u6027<\/strong>\uff1a\u4e00\u662f\u4e00\u65e6\u67d0\u4e2a\u6570\u636e\u66fe\u7ecf\u662f\u70ed\u70b9\uff0c\u5b83\u7684\u8ba1\u6570\u5668\u5c31\u4f1a\u7d2f\u79ef\uff0c\u5373\u4f7f\u8be5\u6570\u636e\u5df2\u7ecf\u4e0d\u518d\u88ab\u8bbf\u95ee\uff0c\u4e5f\u80fd\u5728\u7f13\u5b58\u4e2d\u5b58\u6d3b\u8f83\u957f\u65f6\u95f4\u2014\u2014\u8fd9\u88ab\u79f0\u4e3a”\u7f13\u5b58\u6c61\u67d3”\u95ee\u9898\u3002\u4e8c\u662f\u9700\u8981\u4e3a\u6bcf\u4e2akey\u7ef4\u62a4\u8ba1\u6570\u5668\uff0c\u589e\u52a0\u4e86\u5185\u5b58\u5f00\u9500\u3002\u4e09\u662f\u5728\u8bbf\u95ee\u6a21\u5f0f\u7a81\u7136\u53d8\u5316\u65f6\uff08\u5982\u70ed\u70b9\u66f4\u66ff\uff09\uff0cLFU\u7684\u9002\u5e94\u901f\u5ea6\u4e0d\u5982LRU\u3002<\/p>\n\n\n\n
LRU vs LFU\u7684\u9009\u62e9<\/strong>\uff1a\u5982\u679c\u4f60\u7684\u4e1a\u52a1\u7279\u70b9\u662f\u8bbf\u95ee\u70ed\u70b9\u76f8\u5bf9\u7a33\u5b9a\u3001\u5934\u90e8\u6570\u636e\u8bbf\u95ee\u9891\u6b21\u8fdc\u9ad8\u4e8e\u5176\u4ed6\u6570\u636e\uff0c\u9009\u62e9LFU\u4f1a\u66f4\u9ad8\u6548\uff1b\u5982\u679c\u4f60\u7684\u4e1a\u52a1\u7279\u70b9\u662f\u8bbf\u95ee\u70ed\u70b9\u5feb\u901f\u53d8\u5316\u3001\u66f4\u5f3a\u8c03”\u6700\u8fd1”\u7684\u8bbf\u95ee\u8bb0\u5f55\uff0c\u9009\u62e9LRU\u66f4\u4e3a\u5408\u9002\u3002<\/p>\n\n\n\n
\/\/ LFU \u5b9e\u73b0\uff1a\u53cc\u54c8\u5e0c\u8868 + \u53cc\u5411\u94fe\u8868\n\/\/ \u65f6\u95f4\u590d\u6742\u5ea6\uff1aget\/put \u5747\u4e3a O(1)\n\/\/ \u6838\u5fc3\u601d\u60f3\uff1a\u7528 freqMap \u7ef4\u62a4\u6bcf\u4e2a\u9891\u6b21\u5bf9\u5e94\u7684\u8282\u70b9\u94fe\u8868\uff0c\u6dd8\u6c70\u65f6\u4ece\u6700\u5c0f\u9891\u6b21\u94fe\u8868\u4e2d\u79fb\u9664\nclass LFUCache {\n    private int capacity;              \/\/ \u7f13\u5b58\u5bb9\u91cf\n    private int minFreq;              \/\/ \u5f53\u524d\u6700\u5c0f\u8bbf\u95ee\u9891\u6b21\n    private Map<Integer, Node> cache = new HashMap<>();          \/\/ key -> \u8282\u70b9\n    private Map<Integer, LinkedHashSet<Node>> freqMap = new HashMap<>(); \/\/ freq -> \u8282\u70b9\u94fe\u8868\n\n    public LFUCache(int capacity) {\n        this.capacity = capacity;\n        minFreq = 0;\n    }\n\n    public int get(int key) {\n        if (!cache.containsKey(key)) return -1;\n        Node node = cache.get(key);\n        updateFreq(node); \/\/ \u66f4\u65b0\u8bbf\u95ee\u9891\u6b21\n        return node.value;\n    }\n\n    public void put(int key, int value) {\n        if (capacity == 0) return;\n        \n        if (cache.containsKey(key)) {\n            Node node = cache.get(key);\n            node.value = value;\n            updateFreq(node);\n        } else {\n            \/\/ \u7f13\u5b58\u5df2\u6ee1\uff0c\u5220\u9664\u6700\u5c11\u4f7f\u7528\u7684\u8282\u70b9\n            if (cache.size() == capacity) {\n                LinkedHashSet<Node> minSet = freqMap.get(minFreq);\n                Node toRemove = minSet.iterator().next(); \/\/ \u53d6\u51fa\u4efb\u610f\u4e00\u4e2a\u6700\u5c0f\u9891\u6b21\u7684\u8282\u70b9\n                minSet.remove(toRemove);\n                cache.remove(toRemove.key);\n            }\n            \/\/ \u521b\u5efa\u65b0\u8282\u70b9\uff0c\u521d\u59cb\u9891\u6b21\u4e3a 1\n            Node newNode = new Node(key, value, 1);\n            cache.put(key, newNode);\n            freqMap.computeIfAbsent(1, k -> new LinkedHashSet<>()).add(newNode);\n            minFreq = 1; \/\/ \u65b0\u63d2\u5165\u7684\u8282\u70b9\u9891\u6b21\u81f3\u5c11\u4e3a 1\n        }\n    }\n\n    \/\/ \u66f4\u65b0\u8282\u70b9\u9891\u6b21\uff1a\u4ece\u65e7\u9891\u6b21\u94fe\u8868\u79fb\u9664\uff0c\u52a0\u5165\u65b0\u9891\u6b21\u94fe\u8868\n    private void updateFreq(Node node) {\n        int oldFreq = node.freq;\n        LinkedHashSet<Node> oldSet = freqMap.get(oldFreq);\n        oldSet.remove(node);\n        \n        \/\/ \u5982\u679c\u65e7\u9891\u6b21\u94fe\u8868\u4e3a\u7a7a\uff0c\u79fb\u9664\u8be5\u9891\u6b21\uff0c\u5e76\u66f4\u65b0 minFreq\n        if (oldSet.isEmpty()) {\n            freqMap.remove(oldFreq);\n            if (minFreq == oldFreq) minFreq++;\n        }\n        \n        \/\/ \u9891\u6b21 +1\uff0c\u52a0\u5165\u65b0\u9891\u6b21\u7684\u94fe\u8868\n        node.freq++;\n        freqMap.computeIfAbsent(node.freq, k -> new LinkedHashSet<>()).add(node);\n    }\n\n    \/\/ \u8282\u70b9\uff1a\u5305\u542b key\u3001value \u548c\u8bbf\u95ee\u9891\u6b21 freq\n    class Node {\n        int key, value, freq;\n        Node(int k, int v, int f) { key = k; value = v; freq = f; }\n    }\n}<\/code><\/pre>\n\n\n\n
\u5185\u5b58\u6ee1\u4e86<\/h1>\n\n\n\n
\u5148\u6392\u67e5\u662f\u4e0d\u662f\u5927key\u7684\u95ee\u9898<\/h2>\n\n\n\n
\u9047\u5230\u8fd9\u7c7b\u95ee\u9898\uff0c\u53ef\u4ee5\u5148\u770b\u770b\u662f\u4e0d\u662f\u5927key\u9020\u6210\u7684\u95ee\u9898\uff0c\u518d\u9488\u5bf9\u4e0d\u5408\u7406\u7684\u4e1a\u52a1\u4ee3\u7801\u8fdb\u884c\u4fee\u6539\u3002<\/p>\n\n\n\n
    \n
  1. \u7528redis\u81ea\u5e26\u7684 –bigkey \u53c2\u6570\u53ef\u4ee5\u626b\u63cf\u6bcf\u79cd\u6570\u636e\u7ed3\u6784top1\u7684\u5927key\uff0c\u6bd4\u5982\u5360\u7528\u6700\u5927\u7684string\uff08\u4e0d\u8fc7\u590d\u5408\u7ed3\u6784\u7c7b\u578b\u5982hash\uff0c\u53ea\u80fd\u8fd4\u56de\u5305\u542b\u5143\u7d20\u6700\u591a\u7684key\uff0c\u4f46\u662f\u5143\u7d20\u591a\u4e0d\u4ee3\u8868\u5360\u7528\u5927\uff09<\/li>\n<\/ol>\n\n\n\n
    \/\/ -i \u53ef\u4ee5\u6307\u5b9a\u626b\u63cf\u7684\u95f4\u9694\nredis-cli -p 6379 --bigkeys -i 3<\/code><\/pre>\n\n\n\n
      \n
    1. \u4f7f\u7528Redis\u81ea\u5e26\u7684 SCAN<\/code>\u547d\u4ee4\uff0cSCAN\u547d\u4ee4\u53ef\u4ee5\u8fd4\u56de\u5339\u914d\u7684key\uff0c\u7136\u540e\u518d\u7528 strlen<\/code> hlen<\/code> llen<\/code> \u7b49\u547d\u4ee4\u8fd4\u56de\u957f\u5ea6\u548c\u6210\u5458\u6570\u91cf\u7b49\u7b49\u3002\u4e0d\u8fc7\u8fd8\u662f\u89e3\u51b3\u957f\u5ea6\u4e0d\u4ee3\u8868\u5927\u5c0f\u7684\u95ee\u9898\u3002
      \u5bf9\u4e8e\u96c6\u5408\u7c7b\u578b\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528MEMORY USAGE\uff08Redis 4.0+\uff09\u547d\u4ee4\uff0c\u80fd\u8fd4\u56de\u952e\u503c\u5bf9\u5360\u7528\u7684\u5185\u5b58\u7a7a\u95f4\u3002<\/li>\n\n\n\n
    2. \u4f7f\u7528 redis-rdb-tools<\/code> \u5206\u6790\u5de5\u5177
      \u5206\u6790Redis RDB\u5feb\u7167\u6587\u4ef6\u7684\u5f00\u6e90\u5de5\u5177\u3002\u53ef\u4ee5\u6839\u636e\u9700\u6c42\u81ea\u5b9a\u4e49\u5206\u6790Redis\u5b9e\u4f8b\u4e2d\u6240\u6709key\u7684\u5185\u5b58\u5360\u7528\u60c5\u51b5\u3002<\/li>\n<\/ol>\n\n\n\n
      \u627e\u5230\u5927Key\u4e4b\u540e\uff0c\u5343\u4e07\u522b\u7528 DEL<\/code> \u5220\u9664\u5b83\uff01Redis\u4e3b\u64cd\u4f5c\u662f\u5355\u7ebf\u7a0b\u7684\uff0c\u963b\u585e\uff0c\u76d1\u63a7\u544a\u8b66\u4f1a\u54cd\u7206\u7684\uff01
      \u53ef\u4ee5\u7528 UNLINK<\/code> \u547d\u4ee4\uff0c\u5c06\u8fd9\u4e2aKey\u903b\u8f91\u5220\u9664\uff0c\u4e4b\u540e\u518d\u7531\u540e\u53f0\u7ebf\u7a0b\u8fdb\u884c\u56de\u6536\u3002
      \u5982\u679cRedis\u7248\u672c\u662f\u8001\u53e4\u8463\u4e86\uff0c\u5bf9\u4e8e hash\u3001list\u3001set\u3001zset \u8fd9\u4e9b\u6570\u636e\u7c7b\u578b\u53ef\u4ee5\u5206\u6279\u5220\u9664\u3002\u6bcf\u6b21\u79fb\u9664\u4e00\u90e8\u5206\u6570\u636e\uff0c\u4fdd\u6301\u5de5\u4f5c\u7ebf\u7a0b\u7684\u53ef\u7528\u3002<\/p>\n\n\n\n
      \u914d\u7f6e\u5408\u7406\u7684\u5185\u5b58\u6dd8\u6c70\u7b56\u7565<\/h2>\n\n\n\n
      \u521a\u521a\u63d0\u5230\u4e86\u5185\u5b58\u6dd8\u6c70\u7b56\u7565\uff0c\u5176\u5b9eredis\u662f\u63d0\u4f9b\u4e86\u4e00\u4e9b\u6dd8\u6c70\u7b56\u7565\u7684\u3002\u5f00\u542fredis\u7684\u7f13\u5b58\u6dd8\u6c70\u7b56\u7565\uff0c\u9700\u8981\u8bbe\u7f6e maxmemory<\/code> \u53c2\u6570\u6765\u8bbe\u7f6eRedis\u7684\u6700\u5927\u5185\u5b58\u4f7f\u7528\u91cf\uff0c\u5e76\u901a\u8fc7 maxmemory-policy<\/code> \u9009\u62e9\u5408\u9002\u7684\u6dd8\u6c70\u7b56\u7565\u3002<\/p>\n\n\n\n
      \u9ed8\u8ba4\u7684\u6dd8\u6c70\u7b56\u7565\u662f noevicition<\/code>\uff0c\u5f53\u5185\u5b58\u8fbe\u5230 maxmemory<\/code> \u8bbe\u7f6e\u7684\u9650\u5236\u65f6\uff0c\u62d2\u7edd\u5199\u5165\u65b0\u7684\u6570\u636e\u3002\u5176\u4ed6\u7684\u6dd8\u6c70\u7b56\u7565\uff0c\u53c2\u8003\u8868\u683c\u4e2d\u7684\u8bf4\u660e<\/p>\n\n\n\n
      \u6dd8\u6c70\u7b56\u7565<\/th>\u8bf4\u660e<\/th>\u573a\u666f<\/th><\/tr><\/thead>
      noeviction<\/td>\u9ed8\u8ba4\u7684\u6dd8\u6c70\u7b56\u7565\uff0c\u62d2\u7edd\u5199\u5165\u65b0\u7684\u6570\u636e<\/td>\u6570\u636e\u7edd\u5bf9\u4e0d\u80fd\u4e22\u5931<\/td><\/tr>
      volatile-lru<\/td>\uff08ttl only\uff09\u4f18\u5148\u6dd8\u6c70\u6700\u8fd1\u6700\u5c11\u4f7f\u7528\u7684key\u3002<\/td>\u9002\u7528\u4e8e\u5b58\u653e\u70ed\u70b9\u6570\u636e\u96c6\u7fa4<\/td><\/tr>
      volatile-lfu<\/td>\uff08ttl only\uff09\u4f18\u5148\u6dd8\u6c70\u4f7f\u7528\u9891\u7387\u6700\u4f4e\u7684key\u3002<\/td>\u9002\u7528\u4e8e\u8bbf\u95ee\u9891\u6b21\u5dee\u5f02\u5927\u573a\u666f<\/td><\/tr>
      allkeys-lru<\/td>\u5bf9\u6240\u6709\u952e\uff0c\u6dd8\u6c70\u6700\u8fd1\u6700\u5c11\u4f7f\u7528\u7684key\u3002<\/td>\u4e0d\u5173\u5fc3\u662f\u5426\u81ea\u52a8\u8fc7\u671f\uff0c
      \u9002\u7528\u4e8e\u5b58\u653e\u70ed\u70b9\u6570\u636e\u96c6\u7fa4<\/td><\/tr>
      allkeys-lfu<\/td>\u5bf9\u6240\u6709\u952e\uff0c\u6dd8\u6c70\u4f7f\u7528\u9891\u7387\u6700\u4f4e\u7684key\u3002<\/td>\u4e0d\u5173\u5fc3\u662f\u5426\u81ea\u52a8\u8fc7\u671f\uff0c
      \u9002\u7528\u4e8e\u8bbf\u95ee\u9891\u6b21\u5dee\u5f02\u5927\u573a\u666f<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
      \u53c2\u8003<\/strong><\/h1>\n\n\n\n
      \u3010Redis\u3011—- Redis \u9ed8\u8ba4\u7f13\u5b58\u6dd8\u6c70\u7b56\u7565\uff0c\u548c\u516b\u79cd\u6dd8\u6c70\u7b56\u7565_redis \u9ed8\u8ba4\u6dd8\u6c70\u7b56\u7565-CSDN\u535a\u5ba2<\/a>
      Redis\u7f13\u5b58\u6dd8\u6c70\u7b56\u7565 – \u6b22\u4e50\u8c46123 – \u535a\u5ba2\u56ed<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
      \u4e00\u5929\u591c\u91cc \u51cc\u6668\u4e09\u70b9\uff0c\u544a\u8b66\u94c3\u58f0\u523a\u8033\u7684\u54cd\u8d77\uff0c\u8fd0\u7ef4\u7fa4\u4e0a\u5f39\u51faRedis\u5bb9\u91cf\u4e0a\u9650\u8b66\u544a\u2014\u2014\u4f7f\u7528\u7387\u5df2\u8fbe75%\uff0c\u5373\u5c06\u89e6\u9876\u3002 \u8fd8 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-700","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/forelink.top\/index.php\/wp-json\/wp\/v2\/posts\/700","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/forelink.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/forelink.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/forelink.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/forelink.top\/index.php\/wp-json\/wp\/v2\/comments?post=700"}],"version-history":[{"count":2,"href":"https:\/\/forelink.top\/index.php\/wp-json\/wp\/v2\/posts\/700\/revisions"}],"predecessor-version":[{"id":709,"href":"https:\/\/forelink.top\/index.php\/wp-json\/wp\/v2\/posts\/700\/revisions\/709"}],"wp:attachment":[{"href":"https:\/\/forelink.top\/index.php\/wp-json\/wp\/v2\/media?parent=700"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/forelink.top\/index.php\/wp-json\/wp\/v2\/categories?post=700"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/forelink.top\/index.php\/wp-json\/wp\/v2\/tags?post=700"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}