{
  "version": "https://jsonfeed.org/version/1", 
  "title": "ZooKeeper", 
  "description": "Apache ZooKeeper is an effort to develop and maintain an open-source server which enables highly reliable distributed coordination.", 
  "home_page_url": "https://www.v2ex.com/go/zookeeper", 
  "feed_url": "https://www.v2ex.com/feed/zookeeper.json", 
  "icon": "https://cdn.v2ex.com/navatar/2afe/4567/719_large.png?m=1377460266", 
  "favicon": "https://cdn.v2ex.com/navatar/2afe/4567/719_normal.png?m=1377460266", 
  "items": [
    {
      "author": {
        "url": "https://www.v2ex.com/member/codeboy18", 
        "name": "codeboy18", 
        "avatar": "https://cdn.v2ex.com/avatar/3f57/60dc/280585_large.png?m=1614165693"
      }, 
      "url": "https://www.v2ex.com/t/755955", 
      "title": "Zookeeper Go Client \u539f\u7406\u603b\u7ed3", 
      "id": "https://www.v2ex.com/t/755955", 
      "date_published": "2021-02-24T11:55:12+00:00", 
      "content_html": "<blockquote>\n<p>\u66f4\u591a\u7cbe\u5f69\u5185\u5bb9\uff0c\u8bf7\u5173\u6ce8\u5fae\u4fe1\u516c\u4f17\u53f7\uff1a<strong>\u540e\u7aef\u6280\u672f\u5c0f\u5c4b</strong></p>\n</blockquote>\n<h1>\u3007\u3001\u73af\u5883</h1>\n<p>zk client:  <a href=\"http://github.com/samuel/go-zookeeper\" rel=\"nofollow\">github.com/samuel/go-zookeeper</a></p>\n<h1>\u4e00\u3001zk client \u72b6\u6001</h1>\n<p>zookeeper \u662f\u4e00\u6b3e\u6d41\u884c\u7684\u5206\u5e03\u5f0f\u534f\u8c03\u7ec4\u4ef6\uff0c\u88ab\u5e7f\u6cdb\u7528\u4e8e leader \u9009\u4e3e\u3001\u5206\u5e03\u5f0f\u9501\u3001\u670d\u52a1\u53d1\u73b0\u3001\u540d\u79f0\u670d\u52a1\u3001\u914d\u7f6e\u4e2d\u5fc3\u7b49\u573a\u666f\u3002</p>\n<h2>1. \u72b6\u6001\u542b\u4e49</h2>\n<p>zk client \u4e0e zk server \u5728\u5efa\u7acb\u8fde\u63a5\u3001\u4fdd\u6301\u8fde\u63a5\u3001\u65ad\u5f00\u8fde\u63a5\u7684\u8fc7\u7a0b\u4e2d\uff0c\u4f1a\u7ecf\u5386\u5404\u79cd\u72b6\u6001\u3002\u5982\u4e0b\u6240\u793a</p>\n<pre><code>const\u00a0(\n    // \u6682\u672a\u4f7f\u7528\n\u00a0\u00a0\u00a0\u00a0StateUnknown\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0State\u00a0=\u00a0-1\n    // \u4e0e zk server \u4e4b\u95f4\u7684\u8fde\u63a5\u65ad\u5f00(\u4e5f\u5305\u542b\u521d\u59cb\u72b6\u6001)\uff0c\u6b64\u65f6 zk client \u4f1a\u4e0d\u65ad\u91cd\u8fde\n\u00a0\u00a0\u00a0\u00a0StateDisconnected\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0State\u00a0=\u00a00\n    // \u4e0e zk server \u5efa\u7acb\u8fde\u63a5\u4e4b\u524d\u7684\u6682\u65f6\u72b6\u6001\uff0c\u8868\u793a\u5373\u5c06 connect zk server\n\u00a0\u00a0\u00a0\u00a0StateConnecting\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0State\u00a0=\u00a01\n    // \u6682\u672a\u4f7f\u7528\n\u00a0\u00a0\u00a0\u00a0StateAuthFailed\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0State\u00a0=\u00a04\n    // \u6682\u672a\u4f7f\u7528\n\u00a0\u00a0\u00a0\u00a0StateConnectedReadOnly\u00a0State\u00a0=\u00a05\n    // \u6682\u672a\u4f7f\u7528\n\u00a0\u00a0\u00a0\u00a0StateSaslAuthenticated\u00a0State\u00a0=\u00a06\n    // \u5728\u548c zk server \u91cd\u65b0\u5efa\u7acb TCP \u8fde\u63a5\u4e4b\u540e\uff0c\u63e1\u624b\u9636\u6bb5\u53d1\u73b0 session \u8d85\u65f6\n\u00a0\u00a0\u00a0\u00a0StateExpired\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0State\u00a0=\u00a0-112\n    // \u5728\u548c zk server \u6210\u529f\u5efa\u7acb TCP \u8fde\u63a5\u4e4b\u540e\u7684\u72b6\u6001\n\u00a0\u00a0\u00a0\u00a0StateConnected\u00a0\u00a0=\u00a0State(100)\n    // \u548c zk server \u6210\u529f\u5efa\u7acb TCP \u8fde\u63a5\uff0c\u5e76\u4e14\u6210\u529f\u63e1\u624b(\u5373\u6210\u529f\u521b\u5efa session)\n    StateHasSession\u00a0=\u00a0State(101)\n)\n</code></pre>\n<h2>2. \u72b6\u6001\u8f6c\u6362</h2>\n<p><img alt=\"\" class=\"embedded_image\" loading=\"lazy\" referrerpolicy=\"no-referrer\" rel=\"noreferrer\" src=\"https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/8e2c61fb88174913b633251567d8843c%7Etplv-k3u1fbpfcp-watermark.image\"/></p>\n<h1>\u4e8c\u3001\u8d85\u65f6\u65f6\u95f4</h1>\n<p>\u8d85\u65f6\u65f6\u95f4\u5f88\u5927\u7a0b\u5ea6\u4e0a\u5f71\u54cd\u4e86\u4e0a\u8ff0\u72b6\u6001\u7684\u8f6c\u6362\uff0c\u6709\u4e09\u4e2a\u8d85\u65f6\u65f6\u95f4\u503c\u5f97\u5173\u6ce8\uff1a</p>\n<ul>\n<li>sessionTimeout: session \u8d85\u65f6\u3002\u5f53 client \u4e0e\u67d0\u4e2a zk server \u8fde\u63a5\u5f02\u5e38\u65f6\uff0c\u4f1a\u91cd\u8fde\u8fde\u63a5\u5176\u4ed6 zk server \u3002\u53ea\u8981\u5728 sessionTimeout \u4e4b\u5185\u6210\u529f\u5efa\u7acb TCP \u8fde\u63a5\u5e76\u63e1\u624b\u6210\u529f\uff0c\u4e34\u65f6\u8282\u70b9\u3001watcher \u90fd\u4f1a\u4f5c\u4e3a\u5df2\u6709 session \u7684\u8d44\u6e90\u5f97\u5230\u4fdd\u7559\u3002\u7279\u522b\u8981\u6ce8\u610f\u7684\u662f\uff0csessionTimeout \u5e76\u975e\u5b8c\u5168\u7531 client \u7aef\u8bbe\u7f6e\uff0c\u5b83\u7531 client \u548c server \u7aef\u534f\u5546\u786e\u5b9a\uff1a\u5b83\u5fc5\u987b\u4ecb\u4e8e server \u7aef\u914d\u7f6e\u7684 sessionTimeout \u4e0a\u9650\u548c\u4e0b\u9650\u4e4b\u95f4\u3002</li>\n<li>pingInterval: \u662f zk client \u548c server \u4fdd\u6301\u5fc3\u8df3\u7684\u65f6\u95f4\u95f4\u9694\uff0c\u9ed8\u8ba4 1/3 * sessionTimeout</li>\n<li>recvTimeout\uff1a\u9ed8\u8ba4 2/3 * sessionTimeout \u3002client \u7aef\u53d1\u9001\u8bf7\u6c42\u548c\u63a5\u6536\u54cd\u5e94(\u5305\u542b\u5fc3\u8df3)\u7684\u8d85\u65f6\u65f6\u95f4\u3002\u53e6\u5916 client \u63e1\u624b\u9636\u6bb5\u7684\u8bfb\u5199\u8d85\u65f6\u4e3a 10 * recvTimeout \u3002</li>\n<li>connectTimeout: client \u7aef\u4e0e zk server \u5efa\u7acb TCP \u8fde\u63a5\u7684\u8d85\u65f6</li>\n</ul>\n<pre><code>func\u00a0(c\u00a0*Conn)\u00a0setTimeouts(sessionTimeoutMs\u00a0int32)\u00a0{\n\u00a0\u00a0\u00a0\u00a0c.sessionTimeoutMs\u00a0=\u00a0sessionTimeoutMs\n\u00a0\u00a0\u00a0\u00a0sessionTimeout\u00a0:=\u00a0time.Duration(sessionTimeoutMs)\u00a0*\u00a0time.Millisecond\n\u00a0\u00a0\u00a0\u00a0c.recvTimeout\u00a0=\u00a0sessionTimeout\u00a0*\u00a02\u00a0/\u00a03\n\u00a0\u00a0\u00a0\u00a0c.pingInterval\u00a0=\u00a0c.recvTimeout\u00a0/\u00a02\n}\n</code></pre>\n<h1>\u4e09\u3001\u5f02\u5e38\u5904\u7406</h1>\n<pre><code>//\u00a0Connect\u00a0establishes\u00a0a\u00a0new\u00a0connection\u00a0to\u00a0a\u00a0pool\u00a0of\u00a0zookeeper\n//\u00a0servers.\u00a0The\u00a0provided\u00a0session\u00a0timeout\u00a0sets\u00a0the\u00a0amount\u00a0of\u00a0time\u00a0for\u00a0which\n//\u00a0a\u00a0session\u00a0is\u00a0considered\u00a0valid\u00a0after\u00a0losing\u00a0connection\u00a0to\u00a0a\u00a0server.\u00a0Within\n//\u00a0the\u00a0session\u00a0timeout\u00a0it's\u00a0possible\u00a0to\u00a0reestablish\u00a0a\u00a0connection\u00a0to\u00a0a\u00a0different\n//\u00a0server\u00a0and\u00a0keep\u00a0the\u00a0same\u00a0session.\u00a0This\u00a0is\u00a0means\u00a0any\u00a0ephemeral\u00a0nodes\u00a0and\n//\u00a0watches\u00a0are\u00a0maintained\n</code></pre>\n<p>\u5982\u679c client \u548c server \u7aef\u8fde\u63a5\u53d1\u751f\u5f02\u5e38\uff0c\u53ef\u5206\u4e3a\u4e09\u79cd\u60c5\u51b5\uff1a</p>\n<ul>\n<li>\u4e00\u76f4\u65e0\u6cd5\u6210\u529f\u5efa\u7acb\u8fde\u63a5\u3002\u6b64\u65f6 zk client \u5728 connect()\u4e2d\u6b7b\u5faa\u73af\uff0c\u6b64\u65f6 zk \u670d\u52a1\u5904\u4e8e\u4e0d\u53ef\u7528\u72b6\u6001\u3002\u7528\u6237\u53ef\u6839\u636e\u4e1a\u52a1\u7684\u5177\u4f53\u60c5\u51b5\uff0c\u8ba9\u5e94\u7528\u6216\u9000\u51fa\uff0c\u6216\u964d\u7ea7\uff0c\u6216\u6b7b\u5faa\u73af\u76f4\u5230 zk \u670d\u52a1\u6062\u590d\u3002</li>\n<li>sessionTimeout \u5185\u6210\u529f\u5efa\u7acb\u8fde\u63a5\u3002\u4e34\u65f6\u8282\u70b9\u548c watcher \u5f97\u4ee5\u4fdd\u7559\uff0c\u4e0d\u505a\u4efb\u4f55\u5904\u7406</li>\n<li>sessionTimeout \u5185\u6ca1\u6709\u6210\u529f\u5efa\u7acb\u8fde\u63a5\uff0c\u4f46\u662f\u540e\u6765\u6210\u529f\u4e86\u3002\u6b64\u65f6\u5e94\u7528\u5e94\u5f53\u91cd\u7f6e\u5185\u90e8\u4e0e zk \u76f8\u5173\u7684\u72b6\u6001\uff0c\u6216\u8005\u4e3b\u52a8\u9000\u51fa\u3002</li>\n</ul>\n<blockquote>\n<p><strong>\u63a8\u8350\u9605\u8bfb</strong></p>\n</blockquote>\n<ul>\n<li><a href=\"https://mp.weixin.qq.com/s/ASlSuFJT4uJ22xateeNP1g\" rel=\"nofollow\">STL \u6e90\u7801\u5206\u6790--\u5185\u5b58\u5206\u914d\u5668</a> </li>\n<li><a href=\"https://mp.weixin.qq.com/s/dT3lCxkLliGgSRzSvXYxag\" rel=\"nofollow\">STL \u6e90\u7801\u5206\u6790--vector</a> </li>\n<li><a href=\"https://mp.weixin.qq.com/s/Bu2_CuoDV04ZRTAQgsUYFw\" rel=\"nofollow\">STL \u6e90\u7801\u5206\u6790--string</a> </li>\n<li><a href=\"https://mp.weixin.qq.com/s/5Iw68uE8v7W3FiHkTq5QjA\" rel=\"nofollow\">STL \u6e90\u7801\u5206\u6790--list</a> </li>\n<li><a href=\"https://mp.weixin.qq.com/s/EajNbFWrFBM0nHIxYLCjtw\" rel=\"nofollow\">STL \u6e90\u7801\u5206\u6790--hashtable</a> </li>\n<li><a href=\"https://mp.weixin.qq.com/s/0G3naEv_h1NS4CjeWhphDw\" rel=\"nofollow\">STL \u6e90\u7801\u5206\u6790--deque</a> </li>\n<li><a href=\"https://mp.weixin.qq.com/s/9ZBQBn2R0sGIQy_v4W6NXA\" rel=\"nofollow\">STL \u6e90\u7801\u5206\u6790--iterator</a> </li>\n<li><a href=\"https://mp.weixin.qq.com/s/rP8aJROLiIsHLS1XwFs1Jg\" rel=\"nofollow\">STL \u6e90\u7801\u5206\u6790--traits</a> </li>\n<li><a href=\"https://mp.weixin.qq.com/s/71QjygB1bpP_41zyA1tHtw\" rel=\"nofollow\">STL \u6e90\u7801\u5206\u6790--rbtree</a> </li>\n<li><a href=\"https://mp.weixin.qq.com/s/hN0sxaR96WaQbrPsLsMm8w\" rel=\"nofollow\">STL \u6e90\u7801\u5206\u6790--bitset</a> </li>\n<li><a href=\"https://mp.weixin.qq.com/s/sh7zWiUZLGS25WejxzUngQ\" rel=\"nofollow\">STL \u6e90\u7801\u5206\u6790--algorithm</a> </li>\n<li><a href=\"https://mp.weixin.qq.com/s/BFc93L_IlfETwutid0lD6A\" rel=\"nofollow\">STL \u6e90\u7801\u5206\u6790--functional</a></li>\n</ul>\n<blockquote>\n<p>\u66f4\u591a\u7cbe\u5f69\u5185\u5bb9\uff0c\u8bf7\u626b\u7801\u5173\u6ce8\u5fae\u4fe1\u516c\u4f17\u53f7\uff1a<strong>\u540e\u7aef\u6280\u672f\u5c0f\u5c4b</strong>\u3002\u5982\u679c\u89c9\u5f97\u6587\u7ae0\u5bf9\u4f60\u6709\u5e2e\u52a9\u7684\u8bdd\uff0c\u8bf7\u591a\u591a\u5206\u4eab\u3001\u8f6c\u53d1\u3001\u5728\u770b\u3002<br/>\n<img alt=\"\u4e8c\u7ef4\u7801\" class=\"embedded_image\" loading=\"lazy\" referrerpolicy=\"no-referrer\" rel=\"noreferrer\" src=\"https://backendhouse.github.io/images/qrcode.png\"/></p>\n</blockquote>\n"
    }, 
    {
      "author": {
        "url": "https://www.v2ex.com/member/garyxiongxiong", 
        "name": "garyxiongxiong", 
        "avatar": "https://cdn.v2ex.com/gravatar/48c091313a60f3485fdf0d0894c51b63?s=73&d=retro"
      }, 
      "url": "https://www.v2ex.com/t/750504", 
      "title": "\u4e0d\u61c2\u5c31\u95ee\uff1a Zookeeper \u5206\u5e03\u5f0f\u9501\u5b9e\u73b0\u8fc7\u7a0b\u4e2d\u5982\u4f55\u4fdd\u8bc1\u539f\u5b50\u6027\uff1f", 
      "id": "https://www.v2ex.com/t/750504", 
      "date_published": "2021-02-02T01:49:16+00:00", 
      "content_html": "<p>\u5728\u5b9e\u73b0 zookeeper \u5206\u5e03\u5f0f\u9501\u7684\u8fc7\u7a0b\u4e2d\uff0c\u4e3a\u4e86\u907f\u514d\u7f8a\u7fa4\u6548\u5e94\uff0c\u9700\u8981\u5728\u963b\u585e\u83b7\u53d6\u9501\u7684\u8fc7\u7a0b\u4e2d\u6267\u884c\u4ee5\u4e0b\u6b65\u9aa4\uff1a</p>\n<ol>\n<li>\u6dfb\u52a0\u987a\u5e8f\u4e34\u65f6\u8282\u70b9\u81f3\u9501\u8def\u5f84</li>\n<li>\u83b7\u53d6\u6240\u8def\u5f84\u4e0b\u7684\u8282\u70b9\u5217\u8868\uff0c\u5224\u65ad\u6dfb\u52a0\u7684\u8282\u70b9\u662f\u5426\u5728\u7b2c\u4e00\u4f4d\uff0c\u4e0d\u5728\u5219\u9700\u963b\u585e\u7b49\u5f85\u9501</li>\n<li>\u83b7\u53d6\u8282\u70b9\u5217\u8868\uff0c\u5e76\u76d1\u542c\u5f53\u524d\u7684\u524d\u4e00\u8282\u70b9</li>\n<li>\u7b49\u5f85\u524d\u4e00\u8282\u70b9\u88ab\u5220\u9664\uff0c\u91cd\u65b0\u68c0\u67e5\u662f\u5426\u83b7\u53d6\u5230\u9501</li>\n</ol>\n<p>\u5728\u6309\u6b64\u903b\u8f91\u7f16\u5199\u540e\uff0c\u53d1\u73b0\u7b2c\u4e09\u6b65\u4e2d\u5b58\u5728\u95ee\u9898\uff0c\u53ef\u80fd\u4f1a\u51fa\u73b0\u5982\u4e0b\u60c5\u51b5\uff1a</p>\n<p>\u5728\u83b7\u53d6\u8282\u70b9\u5217\u8868\u5e76\u8ba1\u7b97\u51fa\u524d\u4e00\u8282\u70b9<code>preNode</code>\u540e\uff0c\u76d1\u542c<code>preNode</code>\u5220\u9664\u4e8b\u4ef6\u524d\uff0c\u6b64<code>preNode</code>\u88ab\u5220\u9664\uff0c\u5219\u76d1\u542c\u5668\u6c38\u8fdc\u4e0d\u4f1a\u88ab\u89e6\u53d1\uff0c\u9020\u6210\u6b7b\u9501\u3002</p>\n<p>\u8fd9\u79cd\u60c5\u51b5\u5982\u4f55\u4fdd\u8bc1\u7b2c\u4e09\u6b65\u7684\u539f\u5b50\u6027\uff1f</p>\n"
    }, 
    {
      "author": {
        "url": "https://www.v2ex.com/member/ruandao", 
        "name": "ruandao", 
        "avatar": "https://cdn.v2ex.com/avatar/d0f5/6cc1/53068_large.png?m=1446984931"
      }, 
      "url": "https://www.v2ex.com/t/658022", 
      "date_modified": "2020-03-31T10:34:46+00:00", 
      "content_html": "<p>\u4ec0\u4e48\u60c5\u51b5\u4e0b\uff0c\u9009\u62e9 etcd</p>\n<p>\u4ec0\u4e48\u60c5\u51b5\u4e0b\uff0c\u9009\u62e9 zookeeper</p>\n<p>\u4e3a\u4ec0\u4e48</p>\n<p>\u7f51\u4e0a\u5f88\u591a\u535a\u5ba2\u5217\u4e86\u4e00\u5806\u4f18\u7f3a\u70b9\uff0c\u4f46\u662f\u3002\u3002\u3002\u5927\u8111\u91cc\u9762\u65e0\u6cd5\u5f62\u6210\u5224\u65ad\uff0c\u201c\u60f3\u8981\u4ec0\u4e48\u7684\u65f6\u5019\uff0c\u7531\u4e8e\u6709\u4ec0\u4e48\u4f18\u70b9\u7f3a\u70b9\uff0c\u6240\u4ee5\u9009\u62e9 xxx\u201d</p>\n", 
      "date_published": "2020-03-31T09:43:39+00:00", 
      "title": "etcd vs zookeeper", 
      "id": "https://www.v2ex.com/t/658022"
    }, 
    {
      "author": {
        "url": "https://www.v2ex.com/member/Miiiz", 
        "name": "Miiiz", 
        "avatar": "https://cdn.v2ex.com/gravatar/eda45d45e950a37146f08b6e81272198?s=73&d=retro"
      }, 
      "url": "https://www.v2ex.com/t/515293", 
      "date_modified": "2019-06-03T10:23:14+00:00", 
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      "date_published": "2018-12-07T03:28:56+00:00", 
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      "id": "https://www.v2ex.com/t/515293"
    }
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}