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<pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a>
<span class="sourceLineNo">003</span> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a>
<span class="sourceLineNo">004</span> * distributed with this work for additional information<a name="line.4"></a>
<span class="sourceLineNo">005</span> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a>
<span class="sourceLineNo">006</span> * to you under the Apache License, Version 2.0 (the<a name="line.6"></a>
<span class="sourceLineNo">007</span> * "License"); you may not use this file except in compliance<a name="line.7"></a>
<span class="sourceLineNo">008</span> * with the License. You may obtain a copy of the License at<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
<span class="sourceLineNo">011</span> *<a name="line.11"></a>
<span class="sourceLineNo">012</span> * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a>
<span class="sourceLineNo">013</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a>
<span class="sourceLineNo">014</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a>
<span class="sourceLineNo">015</span> * See the License for the specific language governing permissions and<a name="line.15"></a>
<span class="sourceLineNo">016</span> * limitations under the License.<a name="line.16"></a>
<span class="sourceLineNo">017</span> */<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>package org.apache.hadoop.hbase.replication;<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.io.IOException;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.util.ArrayList;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.util.Collections;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.util.List;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.util.UUID;<a name="line.25"></a>
<span class="sourceLineNo">026</span><a name="line.26"></a>
<span class="sourceLineNo">027</span>import org.apache.hadoop.hbase.zookeeper.ZKListener;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import org.apache.hadoop.hbase.Abortable;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.ServerName;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.zookeeper.ZKClusterId;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.zookeeper.ZKUtil;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import org.apache.hadoop.hbase.zookeeper.ZKWatcher;<a name="line.33"></a>
<span class="sourceLineNo">034</span>import org.apache.zookeeper.KeeperException;<a name="line.34"></a>
<span class="sourceLineNo">035</span>import org.apache.zookeeper.KeeperException.AuthFailedException;<a name="line.35"></a>
<span class="sourceLineNo">036</span>import org.apache.zookeeper.KeeperException.ConnectionLossException;<a name="line.36"></a>
<span class="sourceLineNo">037</span>import org.apache.zookeeper.KeeperException.SessionExpiredException;<a name="line.37"></a>
<span class="sourceLineNo">038</span>import org.slf4j.Logger;<a name="line.38"></a>
<span class="sourceLineNo">039</span>import org.slf4j.LoggerFactory;<a name="line.39"></a>
<span class="sourceLineNo">040</span><a name="line.40"></a>
<span class="sourceLineNo">041</span>/**<a name="line.41"></a>
<span class="sourceLineNo">042</span> * A {@link BaseReplicationEndpoint} for replication endpoints whose<a name="line.42"></a>
<span class="sourceLineNo">043</span> * target cluster is an HBase cluster.<a name="line.43"></a>
<span class="sourceLineNo">044</span> */<a name="line.44"></a>
<span class="sourceLineNo">045</span>@InterfaceAudience.Private<a name="line.45"></a>
<span class="sourceLineNo">046</span>public abstract class HBaseReplicationEndpoint extends BaseReplicationEndpoint<a name="line.46"></a>
<span class="sourceLineNo">047</span> implements Abortable {<a name="line.47"></a>
<span class="sourceLineNo">048</span><a name="line.48"></a>
<span class="sourceLineNo">049</span> private static final Logger LOG = LoggerFactory.getLogger(HBaseReplicationEndpoint.class);<a name="line.49"></a>
<span class="sourceLineNo">050</span><a name="line.50"></a>
<span class="sourceLineNo">051</span> private ZKWatcher zkw = null;<a name="line.51"></a>
<span class="sourceLineNo">052</span><a name="line.52"></a>
<span class="sourceLineNo">053</span> private List&lt;ServerName&gt; regionServers = new ArrayList&lt;&gt;(0);<a name="line.53"></a>
<span class="sourceLineNo">054</span> private long lastRegionServerUpdate;<a name="line.54"></a>
<span class="sourceLineNo">055</span><a name="line.55"></a>
<span class="sourceLineNo">056</span> protected synchronized void disconnect() {<a name="line.56"></a>
<span class="sourceLineNo">057</span> if (zkw != null) {<a name="line.57"></a>
<span class="sourceLineNo">058</span> zkw.close();<a name="line.58"></a>
<span class="sourceLineNo">059</span> }<a name="line.59"></a>
<span class="sourceLineNo">060</span> }<a name="line.60"></a>
<span class="sourceLineNo">061</span><a name="line.61"></a>
<span class="sourceLineNo">062</span> /**<a name="line.62"></a>
<span class="sourceLineNo">063</span> * A private method used to re-establish a zookeeper session with a peer cluster.<a name="line.63"></a>
<span class="sourceLineNo">064</span> * @param ke<a name="line.64"></a>
<span class="sourceLineNo">065</span> */<a name="line.65"></a>
<span class="sourceLineNo">066</span> protected void reconnect(KeeperException ke) {<a name="line.66"></a>
<span class="sourceLineNo">067</span> if (ke instanceof ConnectionLossException || ke instanceof SessionExpiredException<a name="line.67"></a>
<span class="sourceLineNo">068</span> || ke instanceof AuthFailedException) {<a name="line.68"></a>
<span class="sourceLineNo">069</span> String clusterKey = ctx.getPeerConfig().getClusterKey();<a name="line.69"></a>
<span class="sourceLineNo">070</span> LOG.warn("Lost the ZooKeeper connection for peer " + clusterKey, ke);<a name="line.70"></a>
<span class="sourceLineNo">071</span> try {<a name="line.71"></a>
<span class="sourceLineNo">072</span> reloadZkWatcher();<a name="line.72"></a>
<span class="sourceLineNo">073</span> } catch (IOException io) {<a name="line.73"></a>
<span class="sourceLineNo">074</span> LOG.warn("Creation of ZookeeperWatcher failed for peer " + clusterKey, io);<a name="line.74"></a>
<span class="sourceLineNo">075</span> }<a name="line.75"></a>
<span class="sourceLineNo">076</span> }<a name="line.76"></a>
<span class="sourceLineNo">077</span> }<a name="line.77"></a>
<span class="sourceLineNo">078</span><a name="line.78"></a>
<span class="sourceLineNo">079</span> @Override<a name="line.79"></a>
<span class="sourceLineNo">080</span> public void start() {<a name="line.80"></a>
<span class="sourceLineNo">081</span> startAsync();<a name="line.81"></a>
<span class="sourceLineNo">082</span> }<a name="line.82"></a>
<span class="sourceLineNo">083</span><a name="line.83"></a>
<span class="sourceLineNo">084</span> @Override<a name="line.84"></a>
<span class="sourceLineNo">085</span> public void stop() {<a name="line.85"></a>
<span class="sourceLineNo">086</span> stopAsync();<a name="line.86"></a>
<span class="sourceLineNo">087</span> }<a name="line.87"></a>
<span class="sourceLineNo">088</span><a name="line.88"></a>
<span class="sourceLineNo">089</span> @Override<a name="line.89"></a>
<span class="sourceLineNo">090</span> protected void doStart() {<a name="line.90"></a>
<span class="sourceLineNo">091</span> try {<a name="line.91"></a>
<span class="sourceLineNo">092</span> reloadZkWatcher();<a name="line.92"></a>
<span class="sourceLineNo">093</span> notifyStarted();<a name="line.93"></a>
<span class="sourceLineNo">094</span> } catch (IOException e) {<a name="line.94"></a>
<span class="sourceLineNo">095</span> notifyFailed(e);<a name="line.95"></a>
<span class="sourceLineNo">096</span> }<a name="line.96"></a>
<span class="sourceLineNo">097</span> }<a name="line.97"></a>
<span class="sourceLineNo">098</span><a name="line.98"></a>
<span class="sourceLineNo">099</span> @Override<a name="line.99"></a>
<span class="sourceLineNo">100</span> protected void doStop() {<a name="line.100"></a>
<span class="sourceLineNo">101</span> disconnect();<a name="line.101"></a>
<span class="sourceLineNo">102</span> notifyStopped();<a name="line.102"></a>
<span class="sourceLineNo">103</span> }<a name="line.103"></a>
<span class="sourceLineNo">104</span><a name="line.104"></a>
<span class="sourceLineNo">105</span> @Override<a name="line.105"></a>
<span class="sourceLineNo">106</span> // Synchronize peer cluster connection attempts to avoid races and rate<a name="line.106"></a>
<span class="sourceLineNo">107</span> // limit connections when multiple replication sources try to connect to<a name="line.107"></a>
<span class="sourceLineNo">108</span> // the peer cluster. If the peer cluster is down we can get out of control<a name="line.108"></a>
<span class="sourceLineNo">109</span> // over time.<a name="line.109"></a>
<span class="sourceLineNo">110</span> public synchronized UUID getPeerUUID() {<a name="line.110"></a>
<span class="sourceLineNo">111</span> UUID peerUUID = null;<a name="line.111"></a>
<span class="sourceLineNo">112</span> try {<a name="line.112"></a>
<span class="sourceLineNo">113</span> peerUUID = ZKClusterId.getUUIDForCluster(zkw);<a name="line.113"></a>
<span class="sourceLineNo">114</span> } catch (KeeperException ke) {<a name="line.114"></a>
<span class="sourceLineNo">115</span> reconnect(ke);<a name="line.115"></a>
<span class="sourceLineNo">116</span> }<a name="line.116"></a>
<span class="sourceLineNo">117</span> return peerUUID;<a name="line.117"></a>
<span class="sourceLineNo">118</span> }<a name="line.118"></a>
<span class="sourceLineNo">119</span><a name="line.119"></a>
<span class="sourceLineNo">120</span> /**<a name="line.120"></a>
<span class="sourceLineNo">121</span> * Get the ZK connection to this peer<a name="line.121"></a>
<span class="sourceLineNo">122</span> * @return zk connection<a name="line.122"></a>
<span class="sourceLineNo">123</span> */<a name="line.123"></a>
<span class="sourceLineNo">124</span> protected synchronized ZKWatcher getZkw() {<a name="line.124"></a>
<span class="sourceLineNo">125</span> return zkw;<a name="line.125"></a>
<span class="sourceLineNo">126</span> }<a name="line.126"></a>
<span class="sourceLineNo">127</span><a name="line.127"></a>
<span class="sourceLineNo">128</span> /**<a name="line.128"></a>
<span class="sourceLineNo">129</span> * Closes the current ZKW (if not null) and creates a new one<a name="line.129"></a>
<span class="sourceLineNo">130</span> * @throws IOException If anything goes wrong connecting<a name="line.130"></a>
<span class="sourceLineNo">131</span> */<a name="line.131"></a>
<span class="sourceLineNo">132</span> synchronized void reloadZkWatcher() throws IOException {<a name="line.132"></a>
<span class="sourceLineNo">133</span> if (zkw != null) zkw.close();<a name="line.133"></a>
<span class="sourceLineNo">134</span> zkw = new ZKWatcher(ctx.getConfiguration(),<a name="line.134"></a>
<span class="sourceLineNo">135</span> "connection to cluster: " + ctx.getPeerId(), this);<a name="line.135"></a>
<span class="sourceLineNo">136</span> getZkw().registerListener(new PeerRegionServerListener(this));<a name="line.136"></a>
<span class="sourceLineNo">137</span> }<a name="line.137"></a>
<span class="sourceLineNo">138</span><a name="line.138"></a>
<span class="sourceLineNo">139</span> @Override<a name="line.139"></a>
<span class="sourceLineNo">140</span> public void abort(String why, Throwable e) {<a name="line.140"></a>
<span class="sourceLineNo">141</span> LOG.error("The HBaseReplicationEndpoint corresponding to peer " + ctx.getPeerId()<a name="line.141"></a>
<span class="sourceLineNo">142</span> + " was aborted for the following reason(s):" + why, e);<a name="line.142"></a>
<span class="sourceLineNo">143</span> }<a name="line.143"></a>
<span class="sourceLineNo">144</span><a name="line.144"></a>
<span class="sourceLineNo">145</span> @Override<a name="line.145"></a>
<span class="sourceLineNo">146</span> public boolean isAborted() {<a name="line.146"></a>
<span class="sourceLineNo">147</span> // Currently this is never "Aborted", we just log when the abort method is called.<a name="line.147"></a>
<span class="sourceLineNo">148</span> return false;<a name="line.148"></a>
<span class="sourceLineNo">149</span> }<a name="line.149"></a>
<span class="sourceLineNo">150</span><a name="line.150"></a>
<span class="sourceLineNo">151</span> /**<a name="line.151"></a>
<span class="sourceLineNo">152</span> * Get the list of all the region servers from the specified peer<a name="line.152"></a>
<span class="sourceLineNo">153</span> * @param zkw zk connection to use<a name="line.153"></a>
<span class="sourceLineNo">154</span> * @return list of region server addresses or an empty list if the slave is unavailable<a name="line.154"></a>
<span class="sourceLineNo">155</span> */<a name="line.155"></a>
<span class="sourceLineNo">156</span> protected static List&lt;ServerName&gt; fetchSlavesAddresses(ZKWatcher zkw)<a name="line.156"></a>
<span class="sourceLineNo">157</span> throws KeeperException {<a name="line.157"></a>
<span class="sourceLineNo">158</span> List&lt;String&gt; children = ZKUtil.listChildrenAndWatchForNewChildren(zkw,<a name="line.158"></a>
<span class="sourceLineNo">159</span> zkw.getZNodePaths().rsZNode);<a name="line.159"></a>
<span class="sourceLineNo">160</span> if (children == null) {<a name="line.160"></a>
<span class="sourceLineNo">161</span> return Collections.emptyList();<a name="line.161"></a>
<span class="sourceLineNo">162</span> }<a name="line.162"></a>
<span class="sourceLineNo">163</span> List&lt;ServerName&gt; addresses = new ArrayList&lt;&gt;(children.size());<a name="line.163"></a>
<span class="sourceLineNo">164</span> for (String child : children) {<a name="line.164"></a>
<span class="sourceLineNo">165</span> addresses.add(ServerName.parseServerName(child));<a name="line.165"></a>
<span class="sourceLineNo">166</span> }<a name="line.166"></a>
<span class="sourceLineNo">167</span> return addresses;<a name="line.167"></a>
<span class="sourceLineNo">168</span> }<a name="line.168"></a>
<span class="sourceLineNo">169</span><a name="line.169"></a>
<span class="sourceLineNo">170</span> /**<a name="line.170"></a>
<span class="sourceLineNo">171</span> * Get a list of all the addresses of all the region servers<a name="line.171"></a>
<span class="sourceLineNo">172</span> * for this peer cluster<a name="line.172"></a>
<span class="sourceLineNo">173</span> * @return list of addresses<a name="line.173"></a>
<span class="sourceLineNo">174</span> */<a name="line.174"></a>
<span class="sourceLineNo">175</span> // Synchronize peer cluster connection attempts to avoid races and rate<a name="line.175"></a>
<span class="sourceLineNo">176</span> // limit connections when multiple replication sources try to connect to<a name="line.176"></a>
<span class="sourceLineNo">177</span> // the peer cluster. If the peer cluster is down we can get out of control<a name="line.177"></a>
<span class="sourceLineNo">178</span> // over time.<a name="line.178"></a>
<span class="sourceLineNo">179</span> public synchronized List&lt;ServerName&gt; getRegionServers() {<a name="line.179"></a>
<span class="sourceLineNo">180</span> try {<a name="line.180"></a>
<span class="sourceLineNo">181</span> setRegionServers(fetchSlavesAddresses(this.getZkw()));<a name="line.181"></a>
<span class="sourceLineNo">182</span> } catch (KeeperException ke) {<a name="line.182"></a>
<span class="sourceLineNo">183</span> if (LOG.isDebugEnabled()) {<a name="line.183"></a>
<span class="sourceLineNo">184</span> LOG.debug("Fetch slaves addresses failed", ke);<a name="line.184"></a>
<span class="sourceLineNo">185</span> }<a name="line.185"></a>
<span class="sourceLineNo">186</span> reconnect(ke);<a name="line.186"></a>
<span class="sourceLineNo">187</span> }<a name="line.187"></a>
<span class="sourceLineNo">188</span> return regionServers;<a name="line.188"></a>
<span class="sourceLineNo">189</span> }<a name="line.189"></a>
<span class="sourceLineNo">190</span><a name="line.190"></a>
<span class="sourceLineNo">191</span> /**<a name="line.191"></a>
<span class="sourceLineNo">192</span> * Set the list of region servers for that peer<a name="line.192"></a>
<span class="sourceLineNo">193</span> * @param regionServers list of addresses for the region servers<a name="line.193"></a>
<span class="sourceLineNo">194</span> */<a name="line.194"></a>
<span class="sourceLineNo">195</span> public synchronized void setRegionServers(List&lt;ServerName&gt; regionServers) {<a name="line.195"></a>
<span class="sourceLineNo">196</span> this.regionServers = regionServers;<a name="line.196"></a>
<span class="sourceLineNo">197</span> lastRegionServerUpdate = System.currentTimeMillis();<a name="line.197"></a>
<span class="sourceLineNo">198</span> }<a name="line.198"></a>
<span class="sourceLineNo">199</span><a name="line.199"></a>
<span class="sourceLineNo">200</span> /**<a name="line.200"></a>
<span class="sourceLineNo">201</span> * Get the timestamp at which the last change occurred to the list of region servers to replicate<a name="line.201"></a>
<span class="sourceLineNo">202</span> * to.<a name="line.202"></a>
<span class="sourceLineNo">203</span> * @return The System.currentTimeMillis at the last time the list of peer region servers changed.<a name="line.203"></a>
<span class="sourceLineNo">204</span> */<a name="line.204"></a>
<span class="sourceLineNo">205</span> public long getLastRegionServerUpdate() {<a name="line.205"></a>
<span class="sourceLineNo">206</span> return lastRegionServerUpdate;<a name="line.206"></a>
<span class="sourceLineNo">207</span> }<a name="line.207"></a>
<span class="sourceLineNo">208</span><a name="line.208"></a>
<span class="sourceLineNo">209</span> /**<a name="line.209"></a>
<span class="sourceLineNo">210</span> * Tracks changes to the list of region servers in a peer's cluster.<a name="line.210"></a>
<span class="sourceLineNo">211</span> */<a name="line.211"></a>
<span class="sourceLineNo">212</span> public static class PeerRegionServerListener extends ZKListener {<a name="line.212"></a>
<span class="sourceLineNo">213</span><a name="line.213"></a>
<span class="sourceLineNo">214</span> private final HBaseReplicationEndpoint replicationEndpoint;<a name="line.214"></a>
<span class="sourceLineNo">215</span> private final String regionServerListNode;<a name="line.215"></a>
<span class="sourceLineNo">216</span><a name="line.216"></a>
<span class="sourceLineNo">217</span> public PeerRegionServerListener(HBaseReplicationEndpoint replicationPeer) {<a name="line.217"></a>
<span class="sourceLineNo">218</span> super(replicationPeer.getZkw());<a name="line.218"></a>
<span class="sourceLineNo">219</span> this.replicationEndpoint = replicationPeer;<a name="line.219"></a>
<span class="sourceLineNo">220</span> this.regionServerListNode = replicationEndpoint.getZkw().getZNodePaths().rsZNode;<a name="line.220"></a>
<span class="sourceLineNo">221</span> }<a name="line.221"></a>
<span class="sourceLineNo">222</span><a name="line.222"></a>
<span class="sourceLineNo">223</span> @Override<a name="line.223"></a>
<span class="sourceLineNo">224</span> public synchronized void nodeChildrenChanged(String path) {<a name="line.224"></a>
<span class="sourceLineNo">225</span> if (path.equals(regionServerListNode)) {<a name="line.225"></a>
<span class="sourceLineNo">226</span> try {<a name="line.226"></a>
<span class="sourceLineNo">227</span> LOG.info("Detected change to peer region servers, fetching updated list");<a name="line.227"></a>
<span class="sourceLineNo">228</span> replicationEndpoint.setRegionServers(fetchSlavesAddresses(replicationEndpoint.getZkw()));<a name="line.228"></a>
<span class="sourceLineNo">229</span> } catch (KeeperException e) {<a name="line.229"></a>
<span class="sourceLineNo">230</span> LOG.error("Error reading slave addresses", e);<a name="line.230"></a>
<span class="sourceLineNo">231</span> }<a name="line.231"></a>
<span class="sourceLineNo">232</span> }<a name="line.232"></a>
<span class="sourceLineNo">233</span> }<a name="line.233"></a>
<span class="sourceLineNo">234</span> }<a name="line.234"></a>
<span class="sourceLineNo">235</span>}<a name="line.235"></a>
</pre>
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