| <!DOCTYPE HTML> |
| <html lang="en"> |
| <head> |
| <!-- Generated by javadoc (17) --> |
| <title>Source code</title> |
| <meta name="viewport" content="width=device-width, initial-scale=1"> |
| <meta name="description" content="source: package: org.apache.hadoop.hbase.master, class: DrainingServerTracker"> |
| <meta name="generator" content="javadoc/SourceToHTMLConverter"> |
| <link rel="stylesheet" type="text/css" href="../../../../../../stylesheet.css" title="Style"> |
| </head> |
| <body class="source-page"> |
| <main role="main"> |
| <div class="source-container"> |
| <pre><span class="source-line-no">001</span><span id="line-1">/*</span> |
| <span class="source-line-no">002</span><span id="line-2"> * Licensed to the Apache Software Foundation (ASF) under one</span> |
| <span class="source-line-no">003</span><span id="line-3"> * or more contributor license agreements. See the NOTICE file</span> |
| <span class="source-line-no">004</span><span id="line-4"> * distributed with this work for additional information</span> |
| <span class="source-line-no">005</span><span id="line-5"> * regarding copyright ownership. The ASF licenses this file</span> |
| <span class="source-line-no">006</span><span id="line-6"> * to you under the Apache License, Version 2.0 (the</span> |
| <span class="source-line-no">007</span><span id="line-7"> * "License"); you may not use this file except in compliance</span> |
| <span class="source-line-no">008</span><span id="line-8"> * with the License. You may obtain a copy of the License at</span> |
| <span class="source-line-no">009</span><span id="line-9"> *</span> |
| <span class="source-line-no">010</span><span id="line-10"> * http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="source-line-no">011</span><span id="line-11"> *</span> |
| <span class="source-line-no">012</span><span id="line-12"> * Unless required by applicable law or agreed to in writing, software</span> |
| <span class="source-line-no">013</span><span id="line-13"> * distributed under the License is distributed on an "AS IS" BASIS,</span> |
| <span class="source-line-no">014</span><span id="line-14"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span> |
| <span class="source-line-no">015</span><span id="line-15"> * See the License for the specific language governing permissions and</span> |
| <span class="source-line-no">016</span><span id="line-16"> * limitations under the License.</span> |
| <span class="source-line-no">017</span><span id="line-17"> */</span> |
| <span class="source-line-no">018</span><span id="line-18">package org.apache.hadoop.hbase.master;</span> |
| <span class="source-line-no">019</span><span id="line-19"></span> |
| <span class="source-line-no">020</span><span id="line-20">import java.io.IOException;</span> |
| <span class="source-line-no">021</span><span id="line-21">import java.util.List;</span> |
| <span class="source-line-no">022</span><span id="line-22">import java.util.NavigableSet;</span> |
| <span class="source-line-no">023</span><span id="line-23">import java.util.TreeSet;</span> |
| <span class="source-line-no">024</span><span id="line-24">import org.apache.hadoop.hbase.Abortable;</span> |
| <span class="source-line-no">025</span><span id="line-25">import org.apache.hadoop.hbase.ServerName;</span> |
| <span class="source-line-no">026</span><span id="line-26">import org.apache.hadoop.hbase.zookeeper.ZKListener;</span> |
| <span class="source-line-no">027</span><span id="line-27">import org.apache.hadoop.hbase.zookeeper.ZKUtil;</span> |
| <span class="source-line-no">028</span><span id="line-28">import org.apache.hadoop.hbase.zookeeper.ZKWatcher;</span> |
| <span class="source-line-no">029</span><span id="line-29">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">030</span><span id="line-30">import org.apache.zookeeper.KeeperException;</span> |
| <span class="source-line-no">031</span><span id="line-31">import org.slf4j.Logger;</span> |
| <span class="source-line-no">032</span><span id="line-32">import org.slf4j.LoggerFactory;</span> |
| <span class="source-line-no">033</span><span id="line-33"></span> |
| <span class="source-line-no">034</span><span id="line-34">/**</span> |
| <span class="source-line-no">035</span><span id="line-35"> * Tracks the list of draining region servers via ZK.</span> |
| <span class="source-line-no">036</span><span id="line-36"> * <p></span> |
| <span class="source-line-no">037</span><span id="line-37"> * This class is responsible for watching for changes to the draining servers list. It handles</span> |
| <span class="source-line-no">038</span><span id="line-38"> * adds/deletes in the draining RS list and watches each node.</span> |
| <span class="source-line-no">039</span><span id="line-39"> * <p></span> |
| <span class="source-line-no">040</span><span id="line-40"> * If an RS gets deleted from draining list, we call</span> |
| <span class="source-line-no">041</span><span id="line-41"> * {@link ServerManager#removeServerFromDrainList(ServerName)}</span> |
| <span class="source-line-no">042</span><span id="line-42"> * <p></span> |
| <span class="source-line-no">043</span><span id="line-43"> * If an RS gets added to the draining list, we add a watcher to it and call</span> |
| <span class="source-line-no">044</span><span id="line-44"> * {@link ServerManager#addServerToDrainList(ServerName)}</span> |
| <span class="source-line-no">045</span><span id="line-45"> * <p></span> |
| <span class="source-line-no">046</span><span id="line-46"> * This class is deprecated in 2.0 because decommission/draining API goes through master in 2.0. Can</span> |
| <span class="source-line-no">047</span><span id="line-47"> * remove this class in 3.0.</span> |
| <span class="source-line-no">048</span><span id="line-48"> */</span> |
| <span class="source-line-no">049</span><span id="line-49">@InterfaceAudience.Private</span> |
| <span class="source-line-no">050</span><span id="line-50">public class DrainingServerTracker extends ZKListener {</span> |
| <span class="source-line-no">051</span><span id="line-51"> private static final Logger LOG = LoggerFactory.getLogger(DrainingServerTracker.class);</span> |
| <span class="source-line-no">052</span><span id="line-52"></span> |
| <span class="source-line-no">053</span><span id="line-53"> private ServerManager serverManager;</span> |
| <span class="source-line-no">054</span><span id="line-54"> private final NavigableSet<ServerName> drainingServers = new TreeSet<>();</span> |
| <span class="source-line-no">055</span><span id="line-55"> private Abortable abortable;</span> |
| <span class="source-line-no">056</span><span id="line-56"></span> |
| <span class="source-line-no">057</span><span id="line-57"> public DrainingServerTracker(ZKWatcher watcher, Abortable abortable,</span> |
| <span class="source-line-no">058</span><span id="line-58"> ServerManager serverManager) {</span> |
| <span class="source-line-no">059</span><span id="line-59"> super(watcher);</span> |
| <span class="source-line-no">060</span><span id="line-60"> this.abortable = abortable;</span> |
| <span class="source-line-no">061</span><span id="line-61"> this.serverManager = serverManager;</span> |
| <span class="source-line-no">062</span><span id="line-62"> }</span> |
| <span class="source-line-no">063</span><span id="line-63"></span> |
| <span class="source-line-no">064</span><span id="line-64"> /**</span> |
| <span class="source-line-no">065</span><span id="line-65"> * Starts the tracking of draining RegionServers.</span> |
| <span class="source-line-no">066</span><span id="line-66"> * <p></span> |
| <span class="source-line-no">067</span><span id="line-67"> * All Draining RSs will be tracked after this method is called.</span> |
| <span class="source-line-no">068</span><span id="line-68"> */</span> |
| <span class="source-line-no">069</span><span id="line-69"> public void start() throws KeeperException, IOException {</span> |
| <span class="source-line-no">070</span><span id="line-70"> watcher.registerListener(this);</span> |
| <span class="source-line-no">071</span><span id="line-71"> // Add a ServerListener to check if a server is draining when it's added.</span> |
| <span class="source-line-no">072</span><span id="line-72"> serverManager.registerListener(new ServerListener() {</span> |
| <span class="source-line-no">073</span><span id="line-73"> @Override</span> |
| <span class="source-line-no">074</span><span id="line-74"> public void serverAdded(ServerName sn) {</span> |
| <span class="source-line-no">075</span><span id="line-75"> if (drainingServers.contains(sn)) {</span> |
| <span class="source-line-no">076</span><span id="line-76"> serverManager.addServerToDrainList(sn);</span> |
| <span class="source-line-no">077</span><span id="line-77"> }</span> |
| <span class="source-line-no">078</span><span id="line-78"> }</span> |
| <span class="source-line-no">079</span><span id="line-79"> });</span> |
| <span class="source-line-no">080</span><span id="line-80"> List<String> servers =</span> |
| <span class="source-line-no">081</span><span id="line-81"> ZKUtil.listChildrenAndWatchThem(watcher, watcher.getZNodePaths().drainingZNode);</span> |
| <span class="source-line-no">082</span><span id="line-82"> add(servers);</span> |
| <span class="source-line-no">083</span><span id="line-83"> }</span> |
| <span class="source-line-no">084</span><span id="line-84"></span> |
| <span class="source-line-no">085</span><span id="line-85"> private void add(final List<String> servers) throws IOException {</span> |
| <span class="source-line-no">086</span><span id="line-86"> synchronized (this.drainingServers) {</span> |
| <span class="source-line-no">087</span><span id="line-87"> this.drainingServers.clear();</span> |
| <span class="source-line-no">088</span><span id="line-88"> for (String n : servers) {</span> |
| <span class="source-line-no">089</span><span id="line-89"> final ServerName sn = ServerName.valueOf(ZKUtil.getNodeName(n));</span> |
| <span class="source-line-no">090</span><span id="line-90"> this.drainingServers.add(sn);</span> |
| <span class="source-line-no">091</span><span id="line-91"> this.serverManager.addServerToDrainList(sn);</span> |
| <span class="source-line-no">092</span><span id="line-92"> LOG.info("Draining RS node created, adding to list [" + sn + "]");</span> |
| <span class="source-line-no">093</span><span id="line-93"></span> |
| <span class="source-line-no">094</span><span id="line-94"> }</span> |
| <span class="source-line-no">095</span><span id="line-95"> }</span> |
| <span class="source-line-no">096</span><span id="line-96"> }</span> |
| <span class="source-line-no">097</span><span id="line-97"></span> |
| <span class="source-line-no">098</span><span id="line-98"> private void remove(final ServerName sn) {</span> |
| <span class="source-line-no">099</span><span id="line-99"> synchronized (this.drainingServers) {</span> |
| <span class="source-line-no">100</span><span id="line-100"> this.drainingServers.remove(sn);</span> |
| <span class="source-line-no">101</span><span id="line-101"> this.serverManager.removeServerFromDrainList(sn);</span> |
| <span class="source-line-no">102</span><span id="line-102"> }</span> |
| <span class="source-line-no">103</span><span id="line-103"> }</span> |
| <span class="source-line-no">104</span><span id="line-104"></span> |
| <span class="source-line-no">105</span><span id="line-105"> @Override</span> |
| <span class="source-line-no">106</span><span id="line-106"> public void nodeDeleted(final String path) {</span> |
| <span class="source-line-no">107</span><span id="line-107"> if (path.startsWith(watcher.getZNodePaths().drainingZNode)) {</span> |
| <span class="source-line-no">108</span><span id="line-108"> final ServerName sn = ServerName.valueOf(ZKUtil.getNodeName(path));</span> |
| <span class="source-line-no">109</span><span id="line-109"> LOG.info("Draining RS node deleted, removing from list [" + sn + "]");</span> |
| <span class="source-line-no">110</span><span id="line-110"> remove(sn);</span> |
| <span class="source-line-no">111</span><span id="line-111"> }</span> |
| <span class="source-line-no">112</span><span id="line-112"> }</span> |
| <span class="source-line-no">113</span><span id="line-113"></span> |
| <span class="source-line-no">114</span><span id="line-114"> @Override</span> |
| <span class="source-line-no">115</span><span id="line-115"> public void nodeChildrenChanged(final String path) {</span> |
| <span class="source-line-no">116</span><span id="line-116"> if (path.equals(watcher.getZNodePaths().drainingZNode)) {</span> |
| <span class="source-line-no">117</span><span id="line-117"> try {</span> |
| <span class="source-line-no">118</span><span id="line-118"> final List<String> newNodes =</span> |
| <span class="source-line-no">119</span><span id="line-119"> ZKUtil.listChildrenAndWatchThem(watcher, watcher.getZNodePaths().drainingZNode);</span> |
| <span class="source-line-no">120</span><span id="line-120"> add(newNodes);</span> |
| <span class="source-line-no">121</span><span id="line-121"> } catch (KeeperException e) {</span> |
| <span class="source-line-no">122</span><span id="line-122"> abortable.abort("Unexpected zk exception getting RS nodes", e);</span> |
| <span class="source-line-no">123</span><span id="line-123"> } catch (IOException e) {</span> |
| <span class="source-line-no">124</span><span id="line-124"> abortable.abort("Unexpected zk exception getting RS nodes", e);</span> |
| <span class="source-line-no">125</span><span id="line-125"> }</span> |
| <span class="source-line-no">126</span><span id="line-126"> }</span> |
| <span class="source-line-no">127</span><span id="line-127"> }</span> |
| <span class="source-line-no">128</span><span id="line-128">}</span> |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| </pre> |
| </div> |
| </main> |
| </body> |
| </html> |
