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| <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.util.ArrayList;</span> |
| <span class="source-line-no">021</span><span id="line-21">import java.util.Collections;</span> |
| <span class="source-line-no">022</span><span id="line-22">import java.util.Date;</span> |
| <span class="source-line-no">023</span><span id="line-23">import java.util.HashMap;</span> |
| <span class="source-line-no">024</span><span id="line-24">import java.util.HashSet;</span> |
| <span class="source-line-no">025</span><span id="line-25">import java.util.Iterator;</span> |
| <span class="source-line-no">026</span><span id="line-26">import java.util.List;</span> |
| <span class="source-line-no">027</span><span id="line-27">import java.util.Map;</span> |
| <span class="source-line-no">028</span><span id="line-28">import java.util.Set;</span> |
| <span class="source-line-no">029</span><span id="line-29">import org.apache.hadoop.hbase.ServerName;</span> |
| <span class="source-line-no">030</span><span id="line-30">import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;</span> |
| <span class="source-line-no">031</span><span id="line-31">import org.apache.hadoop.hbase.util.Pair;</span> |
| <span class="source-line-no">032</span><span id="line-32">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">033</span><span id="line-33">import org.slf4j.Logger;</span> |
| <span class="source-line-no">034</span><span id="line-34">import org.slf4j.LoggerFactory;</span> |
| <span class="source-line-no">035</span><span id="line-35"></span> |
| <span class="source-line-no">036</span><span id="line-36">/**</span> |
| <span class="source-line-no">037</span><span id="line-37"> * Class to hold dead servers list and utility querying dead server list. Servers are added when</span> |
| <span class="source-line-no">038</span><span id="line-38"> * they expire or when we find them in filesystem on startup. When a server crash procedure is</span> |
| <span class="source-line-no">039</span><span id="line-39"> * queued, it will populate the processing list and then remove the server from processing list when</span> |
| <span class="source-line-no">040</span><span id="line-40"> * done. Servers are removed from dead server list when a new instance is started over the old on</span> |
| <span class="source-line-no">041</span><span id="line-41"> * same hostname and port or when new Master comes online tidying up after all initialization.</span> |
| <span class="source-line-no">042</span><span id="line-42"> * Processing list and deadserver list are not tied together (you don't have to be in deadservers</span> |
| <span class="source-line-no">043</span><span id="line-43"> * list to be processing and vice versa).</span> |
| <span class="source-line-no">044</span><span id="line-44"> */</span> |
| <span class="source-line-no">045</span><span id="line-45">@InterfaceAudience.Private</span> |
| <span class="source-line-no">046</span><span id="line-46">public class DeadServer {</span> |
| <span class="source-line-no">047</span><span id="line-47"> private static final Logger LOG = LoggerFactory.getLogger(DeadServer.class);</span> |
| <span class="source-line-no">048</span><span id="line-48"></span> |
| <span class="source-line-no">049</span><span id="line-49"> /**</span> |
| <span class="source-line-no">050</span><span id="line-50"> * Set of known dead servers. On znode expiration, servers are added here. This is needed in case</span> |
| <span class="source-line-no">051</span><span id="line-51"> * of a network partitioning where the server's lease expires, but the server is still running.</span> |
| <span class="source-line-no">052</span><span id="line-52"> * After the network is healed, and it's server logs are recovered, it will be told to call server</span> |
| <span class="source-line-no">053</span><span id="line-53"> * startup because by then, its regions have probably been reassigned.</span> |
| <span class="source-line-no">054</span><span id="line-54"> */</span> |
| <span class="source-line-no">055</span><span id="line-55"> private final Map<ServerName, Long> deadServers = new HashMap<>();</span> |
| <span class="source-line-no">056</span><span id="line-56"></span> |
| <span class="source-line-no">057</span><span id="line-57"> /**</span> |
| <span class="source-line-no">058</span><span id="line-58"> * @param serverName server name.</span> |
| <span class="source-line-no">059</span><span id="line-59"> * @return true if this server is on the dead servers list false otherwise</span> |
| <span class="source-line-no">060</span><span id="line-60"> */</span> |
| <span class="source-line-no">061</span><span id="line-61"> public synchronized boolean isDeadServer(final ServerName serverName) {</span> |
| <span class="source-line-no">062</span><span id="line-62"> return deadServers.containsKey(serverName);</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"> public synchronized Set<ServerName> copyServerNames() {</span> |
| <span class="source-line-no">066</span><span id="line-66"> Set<ServerName> clone = new HashSet<>(deadServers.size());</span> |
| <span class="source-line-no">067</span><span id="line-67"> clone.addAll(deadServers.keySet());</span> |
| <span class="source-line-no">068</span><span id="line-68"> return clone;</span> |
| <span class="source-line-no">069</span><span id="line-69"> }</span> |
| <span class="source-line-no">070</span><span id="line-70"></span> |
| <span class="source-line-no">071</span><span id="line-71"> /**</span> |
| <span class="source-line-no">072</span><span id="line-72"> * Adds the server to the dead server list if it's not there already.</span> |
| <span class="source-line-no">073</span><span id="line-73"> */</span> |
| <span class="source-line-no">074</span><span id="line-74"> synchronized void putIfAbsent(ServerName sn) {</span> |
| <span class="source-line-no">075</span><span id="line-75"> this.deadServers.putIfAbsent(sn, EnvironmentEdgeManager.currentTime());</span> |
| <span class="source-line-no">076</span><span id="line-76"> }</span> |
| <span class="source-line-no">077</span><span id="line-77"></span> |
| <span class="source-line-no">078</span><span id="line-78"> public synchronized int size() {</span> |
| <span class="source-line-no">079</span><span id="line-79"> return deadServers.size();</span> |
| <span class="source-line-no">080</span><span id="line-80"> }</span> |
| <span class="source-line-no">081</span><span id="line-81"></span> |
| <span class="source-line-no">082</span><span id="line-82"> synchronized boolean isEmpty() {</span> |
| <span class="source-line-no">083</span><span id="line-83"> return deadServers.isEmpty();</span> |
| <span class="source-line-no">084</span><span id="line-84"> }</span> |
| <span class="source-line-no">085</span><span id="line-85"></span> |
| <span class="source-line-no">086</span><span id="line-86"> /**</span> |
| <span class="source-line-no">087</span><span id="line-87"> * Handles restart of a server. The new server instance has a different start code. The new start</span> |
| <span class="source-line-no">088</span><span id="line-88"> * code should be greater than the old one. We don't check that here. Removes the old server from</span> |
| <span class="source-line-no">089</span><span id="line-89"> * deadserver list.</span> |
| <span class="source-line-no">090</span><span id="line-90"> * @param newServerName Servername as either <code>host:port</code> or</span> |
| <span class="source-line-no">091</span><span id="line-91"> * <code>host,port,startcode</code>.</span> |
| <span class="source-line-no">092</span><span id="line-92"> * @return true if this server was dead before and coming back alive again</span> |
| <span class="source-line-no">093</span><span id="line-93"> */</span> |
| <span class="source-line-no">094</span><span id="line-94"> synchronized boolean cleanPreviousInstance(final ServerName newServerName) {</span> |
| <span class="source-line-no">095</span><span id="line-95"> Iterator<ServerName> it = deadServers.keySet().iterator();</span> |
| <span class="source-line-no">096</span><span id="line-96"> while (it.hasNext()) {</span> |
| <span class="source-line-no">097</span><span id="line-97"> if (cleanOldServerName(newServerName, it)) {</span> |
| <span class="source-line-no">098</span><span id="line-98"> return true;</span> |
| <span class="source-line-no">099</span><span id="line-99"> }</span> |
| <span class="source-line-no">100</span><span id="line-100"> }</span> |
| <span class="source-line-no">101</span><span id="line-101"> return false;</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"> synchronized void cleanAllPreviousInstances(final ServerName newServerName) {</span> |
| <span class="source-line-no">105</span><span id="line-105"> Iterator<ServerName> it = deadServers.keySet().iterator();</span> |
| <span class="source-line-no">106</span><span id="line-106"> while (it.hasNext()) {</span> |
| <span class="source-line-no">107</span><span id="line-107"> cleanOldServerName(newServerName, it);</span> |
| <span class="source-line-no">108</span><span id="line-108"> }</span> |
| <span class="source-line-no">109</span><span id="line-109"> }</span> |
| <span class="source-line-no">110</span><span id="line-110"></span> |
| <span class="source-line-no">111</span><span id="line-111"> /**</span> |
| <span class="source-line-no">112</span><span id="line-112"> * @param newServerName Server to match port and hostname against.</span> |
| <span class="source-line-no">113</span><span id="line-113"> * @param deadServerIterator Iterator primed so can call 'next' on it.</span> |
| <span class="source-line-no">114</span><span id="line-114"> * @return True if <code>newServerName</code> and current primed iterator ServerName have same</span> |
| <span class="source-line-no">115</span><span id="line-115"> * host and port and we removed old server from iterator and from processing list.</span> |
| <span class="source-line-no">116</span><span id="line-116"> */</span> |
| <span class="source-line-no">117</span><span id="line-117"> private boolean cleanOldServerName(ServerName newServerName,</span> |
| <span class="source-line-no">118</span><span id="line-118"> Iterator<ServerName> deadServerIterator) {</span> |
| <span class="source-line-no">119</span><span id="line-119"> ServerName sn = deadServerIterator.next();</span> |
| <span class="source-line-no">120</span><span id="line-120"> if (ServerName.isSameAddress(sn, newServerName)) {</span> |
| <span class="source-line-no">121</span><span id="line-121"> // Remove from dead servers list. Don't remove from the processing list --</span> |
| <span class="source-line-no">122</span><span id="line-122"> // let the SCP do it when it is done.</span> |
| <span class="source-line-no">123</span><span id="line-123"> deadServerIterator.remove();</span> |
| <span class="source-line-no">124</span><span id="line-124"> return true;</span> |
| <span class="source-line-no">125</span><span id="line-125"> }</span> |
| <span class="source-line-no">126</span><span id="line-126"> return false;</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> |
| <span class="source-line-no">129</span><span id="line-129"> @Override</span> |
| <span class="source-line-no">130</span><span id="line-130"> public synchronized String toString() {</span> |
| <span class="source-line-no">131</span><span id="line-131"> // Display unified set of servers from both maps</span> |
| <span class="source-line-no">132</span><span id="line-132"> Set<ServerName> servers = new HashSet<>();</span> |
| <span class="source-line-no">133</span><span id="line-133"> servers.addAll(deadServers.keySet());</span> |
| <span class="source-line-no">134</span><span id="line-134"> StringBuilder sb = new StringBuilder();</span> |
| <span class="source-line-no">135</span><span id="line-135"> for (ServerName sn : servers) {</span> |
| <span class="source-line-no">136</span><span id="line-136"> if (sb.length() > 0) {</span> |
| <span class="source-line-no">137</span><span id="line-137"> sb.append(", ");</span> |
| <span class="source-line-no">138</span><span id="line-138"> }</span> |
| <span class="source-line-no">139</span><span id="line-139"> sb.append(sn.toString());</span> |
| <span class="source-line-no">140</span><span id="line-140"> }</span> |
| <span class="source-line-no">141</span><span id="line-141"> return sb.toString();</span> |
| <span class="source-line-no">142</span><span id="line-142"> }</span> |
| <span class="source-line-no">143</span><span id="line-143"></span> |
| <span class="source-line-no">144</span><span id="line-144"> /**</span> |
| <span class="source-line-no">145</span><span id="line-145"> * Extract all the servers dead since a given time, and sort them.</span> |
| <span class="source-line-no">146</span><span id="line-146"> * @param ts the time, 0 for all</span> |
| <span class="source-line-no">147</span><span id="line-147"> * @return a sorted array list, by death time, lowest values first.</span> |
| <span class="source-line-no">148</span><span id="line-148"> */</span> |
| <span class="source-line-no">149</span><span id="line-149"> synchronized List<Pair<ServerName, Long>> copyDeadServersSince(long ts) {</span> |
| <span class="source-line-no">150</span><span id="line-150"> List<Pair<ServerName, Long>> res = new ArrayList<>(size());</span> |
| <span class="source-line-no">151</span><span id="line-151"></span> |
| <span class="source-line-no">152</span><span id="line-152"> for (Map.Entry<ServerName, Long> entry : deadServers.entrySet()) {</span> |
| <span class="source-line-no">153</span><span id="line-153"> if (entry.getValue() >= ts) {</span> |
| <span class="source-line-no">154</span><span id="line-154"> res.add(new Pair<>(entry.getKey(), entry.getValue()));</span> |
| <span class="source-line-no">155</span><span id="line-155"> }</span> |
| <span class="source-line-no">156</span><span id="line-156"> }</span> |
| <span class="source-line-no">157</span><span id="line-157"></span> |
| <span class="source-line-no">158</span><span id="line-158"> Collections.sort(res, (o1, o2) -> o1.getSecond().compareTo(o2.getSecond()));</span> |
| <span class="source-line-no">159</span><span id="line-159"> return res;</span> |
| <span class="source-line-no">160</span><span id="line-160"> }</span> |
| <span class="source-line-no">161</span><span id="line-161"></span> |
| <span class="source-line-no">162</span><span id="line-162"> /**</span> |
| <span class="source-line-no">163</span><span id="line-163"> * Get the time when a server died</span> |
| <span class="source-line-no">164</span><span id="line-164"> * @param deadServerName the dead server name</span> |
| <span class="source-line-no">165</span><span id="line-165"> * @return the date when the server died</span> |
| <span class="source-line-no">166</span><span id="line-166"> */</span> |
| <span class="source-line-no">167</span><span id="line-167"> public synchronized Date getTimeOfDeath(final ServerName deadServerName) {</span> |
| <span class="source-line-no">168</span><span id="line-168"> Long time = deadServers.get(deadServerName);</span> |
| <span class="source-line-no">169</span><span id="line-169"> return time == null ? null : new Date(time);</span> |
| <span class="source-line-no">170</span><span id="line-170"> }</span> |
| <span class="source-line-no">171</span><span id="line-171"></span> |
| <span class="source-line-no">172</span><span id="line-172"> /**</span> |
| <span class="source-line-no">173</span><span id="line-173"> * Called from rpc by operator cleaning up deadserver list.</span> |
| <span class="source-line-no">174</span><span id="line-174"> * @param deadServerName the dead server name</span> |
| <span class="source-line-no">175</span><span id="line-175"> * @return true if this server was removed</span> |
| <span class="source-line-no">176</span><span id="line-176"> */</span> |
| <span class="source-line-no">177</span><span id="line-177"> public synchronized boolean removeDeadServer(final ServerName deadServerName) {</span> |
| <span class="source-line-no">178</span><span id="line-178"> return this.deadServers.remove(deadServerName) != null;</span> |
| <span class="source-line-no">179</span><span id="line-179"> }</span> |
| <span class="source-line-no">180</span><span id="line-180">}</span> |
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| </div> |
| </main> |
| </body> |
| </html> |
