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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>package org.apache.hadoop.hbase;<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>import java.util.ArrayList;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.util.Collections;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.util.List;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.util.concurrent.ConcurrentNavigableMap;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.util.concurrent.ThreadFactory;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import org.apache.hadoop.hbase.exceptions.DeserializationException;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import org.apache.hadoop.hbase.master.RegionState;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import org.apache.hadoop.hbase.trace.TraceUtil;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import org.apache.hadoop.hbase.types.CopyOnWriteArrayMap;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import org.apache.hadoop.hbase.util.RetryCounter;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.util.RetryCounterFactory;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.zookeeper.ZKListener;<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.hadoop.hbase.zookeeper.ZNodePaths;<a name="line.34"></a>
<span class="sourceLineNo">035</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.35"></a>
<span class="sourceLineNo">036</span>import org.apache.zookeeper.KeeperException;<a name="line.36"></a>
<span class="sourceLineNo">037</span>import org.slf4j.Logger;<a name="line.37"></a>
<span class="sourceLineNo">038</span>import org.slf4j.LoggerFactory;<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span>import org.apache.hbase.thirdparty.com.google.common.util.concurrent.ThreadFactoryBuilder;<a name="line.40"></a>
<span class="sourceLineNo">041</span><a name="line.41"></a>
<span class="sourceLineNo">042</span>import org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil;<a name="line.42"></a>
<span class="sourceLineNo">043</span><a name="line.43"></a>
<span class="sourceLineNo">044</span>/**<a name="line.44"></a>
<span class="sourceLineNo">045</span> * A cache of meta region location metadata. Registers a listener on ZK to track changes to the meta<a name="line.45"></a>
<span class="sourceLineNo">046</span> * table znodes. Clients are expected to retry if the meta information is stale. This class is<a name="line.46"></a>
<span class="sourceLineNo">047</span> * thread-safe (a single instance of this class can be shared by multiple threads without race<a name="line.47"></a>
<span class="sourceLineNo">048</span> * conditions).<a name="line.48"></a>
<span class="sourceLineNo">049</span> */<a name="line.49"></a>
<span class="sourceLineNo">050</span>@InterfaceAudience.Private<a name="line.50"></a>
<span class="sourceLineNo">051</span>public class MetaRegionLocationCache extends ZKListener {<a name="line.51"></a>
<span class="sourceLineNo">052</span><a name="line.52"></a>
<span class="sourceLineNo">053</span> private static final Logger LOG = LoggerFactory.getLogger(MetaRegionLocationCache.class);<a name="line.53"></a>
<span class="sourceLineNo">054</span><a name="line.54"></a>
<span class="sourceLineNo">055</span> /**<a name="line.55"></a>
<span class="sourceLineNo">056</span> * Maximum number of times we retry when ZK operation times out.<a name="line.56"></a>
<span class="sourceLineNo">057</span> */<a name="line.57"></a>
<span class="sourceLineNo">058</span> private static final int MAX_ZK_META_FETCH_RETRIES = 10;<a name="line.58"></a>
<span class="sourceLineNo">059</span> /**<a name="line.59"></a>
<span class="sourceLineNo">060</span> * Sleep interval ms between ZK operation retries.<a name="line.60"></a>
<span class="sourceLineNo">061</span> */<a name="line.61"></a>
<span class="sourceLineNo">062</span> private static final int SLEEP_INTERVAL_MS_BETWEEN_RETRIES = 1000;<a name="line.62"></a>
<span class="sourceLineNo">063</span> private static final int SLEEP_INTERVAL_MS_MAX = 10000;<a name="line.63"></a>
<span class="sourceLineNo">064</span> private final RetryCounterFactory retryCounterFactory =<a name="line.64"></a>
<span class="sourceLineNo">065</span> new RetryCounterFactory(MAX_ZK_META_FETCH_RETRIES, SLEEP_INTERVAL_MS_BETWEEN_RETRIES);<a name="line.65"></a>
<span class="sourceLineNo">066</span><a name="line.66"></a>
<span class="sourceLineNo">067</span> /**<a name="line.67"></a>
<span class="sourceLineNo">068</span> * Cached meta region locations indexed by replica ID. CopyOnWriteArrayMap ensures synchronization<a name="line.68"></a>
<span class="sourceLineNo">069</span> * during updates and a consistent snapshot during client requests. Even though<a name="line.69"></a>
<span class="sourceLineNo">070</span> * CopyOnWriteArrayMap copies the data structure for every write, that should be OK since the size<a name="line.70"></a>
<span class="sourceLineNo">071</span> * of the list is often small and mutations are not too often and we do not need to block client<a name="line.71"></a>
<span class="sourceLineNo">072</span> * requests while mutations are in progress.<a name="line.72"></a>
<span class="sourceLineNo">073</span> */<a name="line.73"></a>
<span class="sourceLineNo">074</span> private final CopyOnWriteArrayMap&lt;Integer, HRegionLocation&gt; cachedMetaLocations;<a name="line.74"></a>
<span class="sourceLineNo">075</span><a name="line.75"></a>
<span class="sourceLineNo">076</span> private enum ZNodeOpType {<a name="line.76"></a>
<span class="sourceLineNo">077</span> INIT,<a name="line.77"></a>
<span class="sourceLineNo">078</span> CREATED,<a name="line.78"></a>
<span class="sourceLineNo">079</span> CHANGED,<a name="line.79"></a>
<span class="sourceLineNo">080</span> DELETED<a name="line.80"></a>
<span class="sourceLineNo">081</span> }<a name="line.81"></a>
<span class="sourceLineNo">082</span><a name="line.82"></a>
<span class="sourceLineNo">083</span> public MetaRegionLocationCache(ZKWatcher zkWatcher) {<a name="line.83"></a>
<span class="sourceLineNo">084</span> super(zkWatcher);<a name="line.84"></a>
<span class="sourceLineNo">085</span> cachedMetaLocations = new CopyOnWriteArrayMap&lt;&gt;();<a name="line.85"></a>
<span class="sourceLineNo">086</span> watcher.registerListener(this);<a name="line.86"></a>
<span class="sourceLineNo">087</span> // Populate the initial snapshot of data from meta znodes.<a name="line.87"></a>
<span class="sourceLineNo">088</span> // This is needed because stand-by masters can potentially start after the initial znode<a name="line.88"></a>
<span class="sourceLineNo">089</span> // creation. It blocks forever until the initial meta locations are loaded from ZK and watchers<a name="line.89"></a>
<span class="sourceLineNo">090</span> // are established. Subsequent updates are handled by the registered listener. Also, this runs<a name="line.90"></a>
<span class="sourceLineNo">091</span> // in a separate thread in the background to not block master init.<a name="line.91"></a>
<span class="sourceLineNo">092</span> ThreadFactory threadFactory = new ThreadFactoryBuilder().setDaemon(true).build();<a name="line.92"></a>
<span class="sourceLineNo">093</span> RetryCounterFactory retryFactory = new RetryCounterFactory(Integer.MAX_VALUE,<a name="line.93"></a>
<span class="sourceLineNo">094</span> SLEEP_INTERVAL_MS_BETWEEN_RETRIES, SLEEP_INTERVAL_MS_MAX);<a name="line.94"></a>
<span class="sourceLineNo">095</span> threadFactory.newThread(() -&gt; loadMetaLocationsFromZk(retryFactory.create(), ZNodeOpType.INIT))<a name="line.95"></a>
<span class="sourceLineNo">096</span> .start();<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> /**<a name="line.99"></a>
<span class="sourceLineNo">100</span> * Populates the current snapshot of meta locations from ZK. If no meta znodes exist, it registers<a name="line.100"></a>
<span class="sourceLineNo">101</span> * a watcher on base znode to check for any CREATE/DELETE events on the children.<a name="line.101"></a>
<span class="sourceLineNo">102</span> * @param retryCounter controls the number of retries and sleep between retries.<a name="line.102"></a>
<span class="sourceLineNo">103</span> */<a name="line.103"></a>
<span class="sourceLineNo">104</span> private void loadMetaLocationsFromZk(RetryCounter retryCounter, ZNodeOpType opType) {<a name="line.104"></a>
<span class="sourceLineNo">105</span> TraceUtil.trace(() -&gt; {<a name="line.105"></a>
<span class="sourceLineNo">106</span> List&lt;String&gt; znodes = null;<a name="line.106"></a>
<span class="sourceLineNo">107</span> while (retryCounter.shouldRetry()) {<a name="line.107"></a>
<span class="sourceLineNo">108</span> try {<a name="line.108"></a>
<span class="sourceLineNo">109</span> znodes = watcher.getMetaReplicaNodesAndWatchChildren();<a name="line.109"></a>
<span class="sourceLineNo">110</span> break;<a name="line.110"></a>
<span class="sourceLineNo">111</span> } catch (KeeperException ke) {<a name="line.111"></a>
<span class="sourceLineNo">112</span> LOG.debug("Error populating initial meta locations", ke);<a name="line.112"></a>
<span class="sourceLineNo">113</span> if (!retryCounter.shouldRetry()) {<a name="line.113"></a>
<span class="sourceLineNo">114</span> // Retries exhausted and watchers not set. This is not a desirable state since the cache<a name="line.114"></a>
<span class="sourceLineNo">115</span> // could remain stale forever. Propagate the exception.<a name="line.115"></a>
<span class="sourceLineNo">116</span> watcher.abort("Error populating meta locations", ke);<a name="line.116"></a>
<span class="sourceLineNo">117</span> return;<a name="line.117"></a>
<span class="sourceLineNo">118</span> }<a name="line.118"></a>
<span class="sourceLineNo">119</span> try {<a name="line.119"></a>
<span class="sourceLineNo">120</span> retryCounter.sleepUntilNextRetry();<a name="line.120"></a>
<span class="sourceLineNo">121</span> } catch (InterruptedException ie) {<a name="line.121"></a>
<span class="sourceLineNo">122</span> LOG.error("Interrupted while loading meta locations from ZK", ie);<a name="line.122"></a>
<span class="sourceLineNo">123</span> Thread.currentThread().interrupt();<a name="line.123"></a>
<span class="sourceLineNo">124</span> return;<a name="line.124"></a>
<span class="sourceLineNo">125</span> }<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> if (znodes == null || znodes.isEmpty()) {<a name="line.128"></a>
<span class="sourceLineNo">129</span> // No meta znodes exist at this point but we registered a watcher on the base znode to<a name="line.129"></a>
<span class="sourceLineNo">130</span> // listen for updates. They will be handled via nodeChildrenChanged().<a name="line.130"></a>
<span class="sourceLineNo">131</span> return;<a name="line.131"></a>
<span class="sourceLineNo">132</span> }<a name="line.132"></a>
<span class="sourceLineNo">133</span> if (znodes.size() == cachedMetaLocations.size()) {<a name="line.133"></a>
<span class="sourceLineNo">134</span> // No new meta znodes got added.<a name="line.134"></a>
<span class="sourceLineNo">135</span> return;<a name="line.135"></a>
<span class="sourceLineNo">136</span> }<a name="line.136"></a>
<span class="sourceLineNo">137</span> for (String znode : znodes) {<a name="line.137"></a>
<span class="sourceLineNo">138</span> String path = ZNodePaths.joinZNode(watcher.getZNodePaths().baseZNode, znode);<a name="line.138"></a>
<span class="sourceLineNo">139</span> updateMetaLocation(path, opType);<a name="line.139"></a>
<span class="sourceLineNo">140</span> }<a name="line.140"></a>
<span class="sourceLineNo">141</span> }, "MetaRegionLocationCache.loadMetaLocationsFromZk");<a name="line.141"></a>
<span class="sourceLineNo">142</span> }<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> * Gets the HRegionLocation for a given meta replica ID. Renews the watch on the znode for future<a name="line.145"></a>
<span class="sourceLineNo">146</span> * updates.<a name="line.146"></a>
<span class="sourceLineNo">147</span> * @param replicaId ReplicaID of the region.<a name="line.147"></a>
<span class="sourceLineNo">148</span> * @return HRegionLocation for the meta replica.<a name="line.148"></a>
<span class="sourceLineNo">149</span> * @throws KeeperException if there is any issue fetching/parsing the serialized data.<a name="line.149"></a>
<span class="sourceLineNo">150</span> */<a name="line.150"></a>
<span class="sourceLineNo">151</span> private HRegionLocation getMetaRegionLocation(int replicaId) throws KeeperException {<a name="line.151"></a>
<span class="sourceLineNo">152</span> RegionState metaRegionState;<a name="line.152"></a>
<span class="sourceLineNo">153</span> try {<a name="line.153"></a>
<span class="sourceLineNo">154</span> byte[] data =<a name="line.154"></a>
<span class="sourceLineNo">155</span> ZKUtil.getDataAndWatch(watcher, watcher.getZNodePaths().getZNodeForReplica(replicaId));<a name="line.155"></a>
<span class="sourceLineNo">156</span> metaRegionState = ProtobufUtil.parseMetaRegionStateFrom(data, replicaId);<a name="line.156"></a>
<span class="sourceLineNo">157</span> } catch (DeserializationException e) {<a name="line.157"></a>
<span class="sourceLineNo">158</span> throw ZKUtil.convert(e);<a name="line.158"></a>
<span class="sourceLineNo">159</span> }<a name="line.159"></a>
<span class="sourceLineNo">160</span> return new HRegionLocation(metaRegionState.getRegion(), metaRegionState.getServerName());<a name="line.160"></a>
<span class="sourceLineNo">161</span> }<a name="line.161"></a>
<span class="sourceLineNo">162</span><a name="line.162"></a>
<span class="sourceLineNo">163</span> private void updateMetaLocation(String path, ZNodeOpType opType) {<a name="line.163"></a>
<span class="sourceLineNo">164</span> if (!isValidMetaPath(path)) {<a name="line.164"></a>
<span class="sourceLineNo">165</span> return;<a name="line.165"></a>
<span class="sourceLineNo">166</span> }<a name="line.166"></a>
<span class="sourceLineNo">167</span> LOG.debug("Updating meta znode for path {}: {}", path, opType.name());<a name="line.167"></a>
<span class="sourceLineNo">168</span> int replicaId = watcher.getZNodePaths().getMetaReplicaIdFromPath(path);<a name="line.168"></a>
<span class="sourceLineNo">169</span> RetryCounter retryCounter = retryCounterFactory.create();<a name="line.169"></a>
<span class="sourceLineNo">170</span> HRegionLocation location = null;<a name="line.170"></a>
<span class="sourceLineNo">171</span> while (retryCounter.shouldRetry()) {<a name="line.171"></a>
<span class="sourceLineNo">172</span> try {<a name="line.172"></a>
<span class="sourceLineNo">173</span> if (opType == ZNodeOpType.DELETED) {<a name="line.173"></a>
<span class="sourceLineNo">174</span> if (!ZKUtil.watchAndCheckExists(watcher, path)) {<a name="line.174"></a>
<span class="sourceLineNo">175</span> // The path does not exist, we've set the watcher and we can break for now.<a name="line.175"></a>
<span class="sourceLineNo">176</span> break;<a name="line.176"></a>
<span class="sourceLineNo">177</span> }<a name="line.177"></a>
<span class="sourceLineNo">178</span> // If it is a transient error and the node appears right away, we fetch the<a name="line.178"></a>
<span class="sourceLineNo">179</span> // latest meta state.<a name="line.179"></a>
<span class="sourceLineNo">180</span> }<a name="line.180"></a>
<span class="sourceLineNo">181</span> location = getMetaRegionLocation(replicaId);<a name="line.181"></a>
<span class="sourceLineNo">182</span> break;<a name="line.182"></a>
<span class="sourceLineNo">183</span> } catch (KeeperException e) {<a name="line.183"></a>
<span class="sourceLineNo">184</span> LOG.debug("Error getting meta location for path {}", path, e);<a name="line.184"></a>
<span class="sourceLineNo">185</span> if (!retryCounter.shouldRetry()) {<a name="line.185"></a>
<span class="sourceLineNo">186</span> LOG.warn("Error getting meta location for path {}. Retries exhausted.", path, e);<a name="line.186"></a>
<span class="sourceLineNo">187</span> break;<a name="line.187"></a>
<span class="sourceLineNo">188</span> }<a name="line.188"></a>
<span class="sourceLineNo">189</span> try {<a name="line.189"></a>
<span class="sourceLineNo">190</span> retryCounter.sleepUntilNextRetry();<a name="line.190"></a>
<span class="sourceLineNo">191</span> } catch (InterruptedException ie) {<a name="line.191"></a>
<span class="sourceLineNo">192</span> Thread.currentThread().interrupt();<a name="line.192"></a>
<span class="sourceLineNo">193</span> return;<a name="line.193"></a>
<span class="sourceLineNo">194</span> }<a name="line.194"></a>
<span class="sourceLineNo">195</span> }<a name="line.195"></a>
<span class="sourceLineNo">196</span> }<a name="line.196"></a>
<span class="sourceLineNo">197</span> if (location == null) {<a name="line.197"></a>
<span class="sourceLineNo">198</span> cachedMetaLocations.remove(replicaId);<a name="line.198"></a>
<span class="sourceLineNo">199</span> return;<a name="line.199"></a>
<span class="sourceLineNo">200</span> }<a name="line.200"></a>
<span class="sourceLineNo">201</span> cachedMetaLocations.put(replicaId, location);<a name="line.201"></a>
<span class="sourceLineNo">202</span> }<a name="line.202"></a>
<span class="sourceLineNo">203</span><a name="line.203"></a>
<span class="sourceLineNo">204</span> /** Returns Optional list of HRegionLocations for meta replica(s), null if the cache is empty. */<a name="line.204"></a>
<span class="sourceLineNo">205</span> public List&lt;HRegionLocation&gt; getMetaRegionLocations() {<a name="line.205"></a>
<span class="sourceLineNo">206</span> ConcurrentNavigableMap&lt;Integer, HRegionLocation&gt; snapshot =<a name="line.206"></a>
<span class="sourceLineNo">207</span> cachedMetaLocations.tailMap(cachedMetaLocations.firstKey());<a name="line.207"></a>
<span class="sourceLineNo">208</span> if (snapshot.isEmpty()) {<a name="line.208"></a>
<span class="sourceLineNo">209</span> // This could be possible if the master has not successfully initialized yet or meta region<a name="line.209"></a>
<span class="sourceLineNo">210</span> // is stuck in some weird state.<a name="line.210"></a>
<span class="sourceLineNo">211</span> return Collections.emptyList();<a name="line.211"></a>
<span class="sourceLineNo">212</span> }<a name="line.212"></a>
<span class="sourceLineNo">213</span> List&lt;HRegionLocation&gt; result = new ArrayList&lt;&gt;();<a name="line.213"></a>
<span class="sourceLineNo">214</span> // Explicitly iterate instead of new ArrayList&lt;&gt;(snapshot.values()) because the underlying<a name="line.214"></a>
<span class="sourceLineNo">215</span> // ArrayValueCollection does not implement toArray().<a name="line.215"></a>
<span class="sourceLineNo">216</span> snapshot.values().forEach(location -&gt; result.add(location));<a name="line.216"></a>
<span class="sourceLineNo">217</span> return result;<a name="line.217"></a>
<span class="sourceLineNo">218</span> }<a name="line.218"></a>
<span class="sourceLineNo">219</span><a name="line.219"></a>
<span class="sourceLineNo">220</span> /**<a name="line.220"></a>
<span class="sourceLineNo">221</span> * Helper to check if the given 'path' corresponds to a meta znode. This listener is only<a name="line.221"></a>
<span class="sourceLineNo">222</span> * interested in changes to meta znodes.<a name="line.222"></a>
<span class="sourceLineNo">223</span> */<a name="line.223"></a>
<span class="sourceLineNo">224</span> private boolean isValidMetaPath(String path) {<a name="line.224"></a>
<span class="sourceLineNo">225</span> return watcher.getZNodePaths().isMetaZNodePath(path);<a name="line.225"></a>
<span class="sourceLineNo">226</span> }<a name="line.226"></a>
<span class="sourceLineNo">227</span><a name="line.227"></a>
<span class="sourceLineNo">228</span> @Override<a name="line.228"></a>
<span class="sourceLineNo">229</span> public void nodeCreated(String path) {<a name="line.229"></a>
<span class="sourceLineNo">230</span> updateMetaLocation(path, ZNodeOpType.CREATED);<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> @Override<a name="line.233"></a>
<span class="sourceLineNo">234</span> public void nodeDeleted(String path) {<a name="line.234"></a>
<span class="sourceLineNo">235</span> updateMetaLocation(path, ZNodeOpType.DELETED);<a name="line.235"></a>
<span class="sourceLineNo">236</span> }<a name="line.236"></a>
<span class="sourceLineNo">237</span><a name="line.237"></a>
<span class="sourceLineNo">238</span> @Override<a name="line.238"></a>
<span class="sourceLineNo">239</span> public void nodeDataChanged(String path) {<a name="line.239"></a>
<span class="sourceLineNo">240</span> updateMetaLocation(path, ZNodeOpType.CHANGED);<a name="line.240"></a>
<span class="sourceLineNo">241</span> }<a name="line.241"></a>
<span class="sourceLineNo">242</span><a name="line.242"></a>
<span class="sourceLineNo">243</span> @Override<a name="line.243"></a>
<span class="sourceLineNo">244</span> public void nodeChildrenChanged(String path) {<a name="line.244"></a>
<span class="sourceLineNo">245</span> if (!path.equals(watcher.getZNodePaths().baseZNode)) {<a name="line.245"></a>
<span class="sourceLineNo">246</span> return;<a name="line.246"></a>
<span class="sourceLineNo">247</span> }<a name="line.247"></a>
<span class="sourceLineNo">248</span> loadMetaLocationsFromZk(retryCounterFactory.create(), ZNodeOpType.CHANGED);<a name="line.248"></a>
<span class="sourceLineNo">249</span> }<a name="line.249"></a>
<span class="sourceLineNo">250</span>}<a name="line.250"></a>
</pre>
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