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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.backup.example;<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>import java.io.IOException;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.util.List;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import org.apache.hadoop.conf.Configuration;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import org.apache.hadoop.hbase.ZooKeeperConnectionException;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import org.apache.hadoop.hbase.zookeeper.ZKListener;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import org.apache.hadoop.hbase.zookeeper.ZKUtil;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import org.apache.hadoop.hbase.zookeeper.ZKWatcher;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import org.apache.zookeeper.KeeperException;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import org.slf4j.Logger;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import org.slf4j.LoggerFactory;<a name="line.30"></a>
<span class="sourceLineNo">031</span><a name="line.31"></a>
<span class="sourceLineNo">032</span>/**<a name="line.32"></a>
<span class="sourceLineNo">033</span> * Track HFile archiving state changes in ZooKeeper. Keeps track of the tables whose HFiles should<a name="line.33"></a>
<span class="sourceLineNo">034</span> * be kept in the archive.<a name="line.34"></a>
<span class="sourceLineNo">035</span> * &lt;p&gt;<a name="line.35"></a>
<span class="sourceLineNo">036</span> * {@link TableHFileArchiveTracker#start()} needs to be called to start monitoring for tables to<a name="line.36"></a>
<span class="sourceLineNo">037</span> * archive.<a name="line.37"></a>
<span class="sourceLineNo">038</span> */<a name="line.38"></a>
<span class="sourceLineNo">039</span>@InterfaceAudience.Private<a name="line.39"></a>
<span class="sourceLineNo">040</span>public final class TableHFileArchiveTracker extends ZKListener {<a name="line.40"></a>
<span class="sourceLineNo">041</span> private static final Logger LOG = LoggerFactory.getLogger(TableHFileArchiveTracker.class);<a name="line.41"></a>
<span class="sourceLineNo">042</span> public static final String HFILE_ARCHIVE_ZNODE_PARENT = "hfilearchive";<a name="line.42"></a>
<span class="sourceLineNo">043</span> private HFileArchiveTableMonitor monitor;<a name="line.43"></a>
<span class="sourceLineNo">044</span> private String archiveHFileZNode;<a name="line.44"></a>
<span class="sourceLineNo">045</span> private boolean stopped = false;<a name="line.45"></a>
<span class="sourceLineNo">046</span><a name="line.46"></a>
<span class="sourceLineNo">047</span> private TableHFileArchiveTracker(ZKWatcher watcher, HFileArchiveTableMonitor monitor) {<a name="line.47"></a>
<span class="sourceLineNo">048</span> super(watcher);<a name="line.48"></a>
<span class="sourceLineNo">049</span> watcher.registerListener(this);<a name="line.49"></a>
<span class="sourceLineNo">050</span> this.monitor = monitor;<a name="line.50"></a>
<span class="sourceLineNo">051</span> this.archiveHFileZNode =<a name="line.51"></a>
<span class="sourceLineNo">052</span> ZKTableArchiveClient.getArchiveZNode(watcher.getConfiguration(), watcher);<a name="line.52"></a>
<span class="sourceLineNo">053</span> }<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> * Start monitoring for archive updates<a name="line.56"></a>
<span class="sourceLineNo">057</span> * @throws KeeperException on failure to find/create nodes<a name="line.57"></a>
<span class="sourceLineNo">058</span> */<a name="line.58"></a>
<span class="sourceLineNo">059</span> public void start() throws KeeperException {<a name="line.59"></a>
<span class="sourceLineNo">060</span> // if archiving is enabled, then read in the list of tables to archive<a name="line.60"></a>
<span class="sourceLineNo">061</span> LOG.debug("Starting hfile archive tracker...");<a name="line.61"></a>
<span class="sourceLineNo">062</span> this.checkEnabledAndUpdate();<a name="line.62"></a>
<span class="sourceLineNo">063</span> LOG.debug("Finished starting hfile archive tracker!");<a name="line.63"></a>
<span class="sourceLineNo">064</span> }<a name="line.64"></a>
<span class="sourceLineNo">065</span><a name="line.65"></a>
<span class="sourceLineNo">066</span> @Override<a name="line.66"></a>
<span class="sourceLineNo">067</span> public void nodeCreated(String path) {<a name="line.67"></a>
<span class="sourceLineNo">068</span> // if it is the archive path<a name="line.68"></a>
<span class="sourceLineNo">069</span> if (!path.startsWith(archiveHFileZNode)) {<a name="line.69"></a>
<span class="sourceLineNo">070</span> return;<a name="line.70"></a>
<span class="sourceLineNo">071</span> }<a name="line.71"></a>
<span class="sourceLineNo">072</span><a name="line.72"></a>
<span class="sourceLineNo">073</span> LOG.debug("Archive node: " + path + " created");<a name="line.73"></a>
<span class="sourceLineNo">074</span> // since we are already enabled, just update a single table<a name="line.74"></a>
<span class="sourceLineNo">075</span> String table = path.substring(archiveHFileZNode.length());<a name="line.75"></a>
<span class="sourceLineNo">076</span><a name="line.76"></a>
<span class="sourceLineNo">077</span> // the top level node has come up, so read in all the tables<a name="line.77"></a>
<span class="sourceLineNo">078</span> if (table.length() == 0) {<a name="line.78"></a>
<span class="sourceLineNo">079</span> checkEnabledAndUpdate();<a name="line.79"></a>
<span class="sourceLineNo">080</span> return;<a name="line.80"></a>
<span class="sourceLineNo">081</span> }<a name="line.81"></a>
<span class="sourceLineNo">082</span> // find the table that needs to be archived<a name="line.82"></a>
<span class="sourceLineNo">083</span> try {<a name="line.83"></a>
<span class="sourceLineNo">084</span> addAndReWatchTable(path);<a name="line.84"></a>
<span class="sourceLineNo">085</span> } catch (KeeperException e) {<a name="line.85"></a>
<span class="sourceLineNo">086</span> LOG.warn(<a name="line.86"></a>
<span class="sourceLineNo">087</span> "Couldn't read zookeeper data for table for path:" + path + ", not preserving a table.", e);<a name="line.87"></a>
<span class="sourceLineNo">088</span> }<a name="line.88"></a>
<span class="sourceLineNo">089</span> }<a name="line.89"></a>
<span class="sourceLineNo">090</span><a name="line.90"></a>
<span class="sourceLineNo">091</span> @Override<a name="line.91"></a>
<span class="sourceLineNo">092</span> public void nodeChildrenChanged(String path) {<a name="line.92"></a>
<span class="sourceLineNo">093</span> if (!path.startsWith(archiveHFileZNode)) {<a name="line.93"></a>
<span class="sourceLineNo">094</span> return;<a name="line.94"></a>
<span class="sourceLineNo">095</span> }<a name="line.95"></a>
<span class="sourceLineNo">096</span><a name="line.96"></a>
<span class="sourceLineNo">097</span> LOG.debug("Archive node: " + path + " children changed.");<a name="line.97"></a>
<span class="sourceLineNo">098</span> // a table was added to the archive<a name="line.98"></a>
<span class="sourceLineNo">099</span> try {<a name="line.99"></a>
<span class="sourceLineNo">100</span> updateWatchedTables();<a name="line.100"></a>
<span class="sourceLineNo">101</span> } catch (KeeperException e) {<a name="line.101"></a>
<span class="sourceLineNo">102</span> LOG.error("Failed to update tables to archive", e);<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><a name="line.105"></a>
<span class="sourceLineNo">106</span> /**<a name="line.106"></a>
<span class="sourceLineNo">107</span> * Add this table to the tracker and then read a watch on that node.<a name="line.107"></a>
<span class="sourceLineNo">108</span> * &lt;p&gt;<a name="line.108"></a>
<span class="sourceLineNo">109</span> * Handles situation where table is deleted in the time between the update and resetting the watch<a name="line.109"></a>
<span class="sourceLineNo">110</span> * by deleting the table via {@link #safeStopTrackingTable(String)}<a name="line.110"></a>
<span class="sourceLineNo">111</span> * @param tableZnode full zookeeper path to the table to be added<a name="line.111"></a>
<span class="sourceLineNo">112</span> * @throws KeeperException if an unexpected zk exception occurs<a name="line.112"></a>
<span class="sourceLineNo">113</span> */<a name="line.113"></a>
<span class="sourceLineNo">114</span> private void addAndReWatchTable(String tableZnode) throws KeeperException {<a name="line.114"></a>
<span class="sourceLineNo">115</span> getMonitor().addTable(ZKUtil.getNodeName(tableZnode));<a name="line.115"></a>
<span class="sourceLineNo">116</span> // re-add a watch to the table created<a name="line.116"></a>
<span class="sourceLineNo">117</span> // and check to make sure it wasn't deleted<a name="line.117"></a>
<span class="sourceLineNo">118</span> if (!ZKUtil.watchAndCheckExists(watcher, tableZnode)) {<a name="line.118"></a>
<span class="sourceLineNo">119</span> safeStopTrackingTable(tableZnode);<a name="line.119"></a>
<span class="sourceLineNo">120</span> }<a name="line.120"></a>
<span class="sourceLineNo">121</span> }<a name="line.121"></a>
<span class="sourceLineNo">122</span><a name="line.122"></a>
<span class="sourceLineNo">123</span> /**<a name="line.123"></a>
<span class="sourceLineNo">124</span> * Stop tracking a table. Ensures that the table doesn't exist, but if it does, it attempts to add<a name="line.124"></a>
<span class="sourceLineNo">125</span> * the table back via {@link #addAndReWatchTable(String)} - its a 'safe' removal.<a name="line.125"></a>
<span class="sourceLineNo">126</span> * @param tableZnode full zookeeper path to the table to be added<a name="line.126"></a>
<span class="sourceLineNo">127</span> * @throws KeeperException if an unexpected zk exception occurs<a name="line.127"></a>
<span class="sourceLineNo">128</span> */<a name="line.128"></a>
<span class="sourceLineNo">129</span> private void safeStopTrackingTable(String tableZnode) throws KeeperException {<a name="line.129"></a>
<span class="sourceLineNo">130</span> getMonitor().removeTable(ZKUtil.getNodeName(tableZnode));<a name="line.130"></a>
<span class="sourceLineNo">131</span> // if the table exists, then add and rewatch it<a name="line.131"></a>
<span class="sourceLineNo">132</span> if (ZKUtil.checkExists(watcher, tableZnode) &gt;= 0) {<a name="line.132"></a>
<span class="sourceLineNo">133</span> addAndReWatchTable(tableZnode);<a name="line.133"></a>
<span class="sourceLineNo">134</span> }<a name="line.134"></a>
<span class="sourceLineNo">135</span> }<a name="line.135"></a>
<span class="sourceLineNo">136</span><a name="line.136"></a>
<span class="sourceLineNo">137</span> @Override<a name="line.137"></a>
<span class="sourceLineNo">138</span> public void nodeDeleted(String path) {<a name="line.138"></a>
<span class="sourceLineNo">139</span> if (!path.startsWith(archiveHFileZNode)) {<a name="line.139"></a>
<span class="sourceLineNo">140</span> return;<a name="line.140"></a>
<span class="sourceLineNo">141</span> }<a name="line.141"></a>
<span class="sourceLineNo">142</span><a name="line.142"></a>
<span class="sourceLineNo">143</span> LOG.debug("Archive node: " + path + " deleted");<a name="line.143"></a>
<span class="sourceLineNo">144</span> String table = path.substring(archiveHFileZNode.length());<a name="line.144"></a>
<span class="sourceLineNo">145</span> // if we stop archiving all tables<a name="line.145"></a>
<span class="sourceLineNo">146</span> if (table.length() == 0) {<a name="line.146"></a>
<span class="sourceLineNo">147</span> // make sure we have the tracker before deleting the archive<a name="line.147"></a>
<span class="sourceLineNo">148</span> // but if we don't, we don't care about delete<a name="line.148"></a>
<span class="sourceLineNo">149</span> clearTables();<a name="line.149"></a>
<span class="sourceLineNo">150</span> // watches are one-time events, so we need to renew our subscription to<a name="line.150"></a>
<span class="sourceLineNo">151</span> // the archive node and might as well check to make sure archiving<a name="line.151"></a>
<span class="sourceLineNo">152</span> // didn't come back on at the same time<a name="line.152"></a>
<span class="sourceLineNo">153</span> checkEnabledAndUpdate();<a name="line.153"></a>
<span class="sourceLineNo">154</span> return;<a name="line.154"></a>
<span class="sourceLineNo">155</span> }<a name="line.155"></a>
<span class="sourceLineNo">156</span> // just stop archiving one table<a name="line.156"></a>
<span class="sourceLineNo">157</span> // note that we don't attempt to add another watch for that table into zk.<a name="line.157"></a>
<span class="sourceLineNo">158</span> // We have no assurances that the table will be archived again (or even<a name="line.158"></a>
<span class="sourceLineNo">159</span> // exists for that matter), so its better not to add unnecessary load to<a name="line.159"></a>
<span class="sourceLineNo">160</span> // zk for watches. If the table is created again, then we will get the<a name="line.160"></a>
<span class="sourceLineNo">161</span> // notification in childrenChanaged.<a name="line.161"></a>
<span class="sourceLineNo">162</span> getMonitor().removeTable(ZKUtil.getNodeName(path));<a name="line.162"></a>
<span class="sourceLineNo">163</span> }<a name="line.163"></a>
<span class="sourceLineNo">164</span><a name="line.164"></a>
<span class="sourceLineNo">165</span> /**<a name="line.165"></a>
<span class="sourceLineNo">166</span> * Sets the watch on the top-level archive znode, and then updates the monitor with the current<a name="line.166"></a>
<span class="sourceLineNo">167</span> * tables that should be archived (and ensures that those nodes are watched as well).<a name="line.167"></a>
<span class="sourceLineNo">168</span> */<a name="line.168"></a>
<span class="sourceLineNo">169</span> private void checkEnabledAndUpdate() {<a name="line.169"></a>
<span class="sourceLineNo">170</span> try {<a name="line.170"></a>
<span class="sourceLineNo">171</span> if (ZKUtil.watchAndCheckExists(watcher, archiveHFileZNode)) {<a name="line.171"></a>
<span class="sourceLineNo">172</span> LOG.debug(archiveHFileZNode + " znode does exist, checking for tables to archive");<a name="line.172"></a>
<span class="sourceLineNo">173</span><a name="line.173"></a>
<span class="sourceLineNo">174</span> // update the tables we should backup, to get the most recent state.<a name="line.174"></a>
<span class="sourceLineNo">175</span> // This is safer than also watching for children and then hoping we get<a name="line.175"></a>
<span class="sourceLineNo">176</span> // all the updates as it makes sure we get and watch all the children<a name="line.176"></a>
<span class="sourceLineNo">177</span> updateWatchedTables();<a name="line.177"></a>
<span class="sourceLineNo">178</span> } else {<a name="line.178"></a>
<span class="sourceLineNo">179</span> LOG.debug("Archiving not currently enabled, waiting");<a name="line.179"></a>
<span class="sourceLineNo">180</span> }<a name="line.180"></a>
<span class="sourceLineNo">181</span> } catch (KeeperException e) {<a name="line.181"></a>
<span class="sourceLineNo">182</span> LOG.warn("Failed to watch for archiving znode", e);<a name="line.182"></a>
<span class="sourceLineNo">183</span> }<a name="line.183"></a>
<span class="sourceLineNo">184</span> }<a name="line.184"></a>
<span class="sourceLineNo">185</span><a name="line.185"></a>
<span class="sourceLineNo">186</span> /**<a name="line.186"></a>
<span class="sourceLineNo">187</span> * Read the list of children under the archive znode as table names and then sets those tables to<a name="line.187"></a>
<span class="sourceLineNo">188</span> * the list of tables that we should archive<a name="line.188"></a>
<span class="sourceLineNo">189</span> * @throws KeeperException if there is an unexpected zk exception<a name="line.189"></a>
<span class="sourceLineNo">190</span> */<a name="line.190"></a>
<span class="sourceLineNo">191</span> private void updateWatchedTables() throws KeeperException {<a name="line.191"></a>
<span class="sourceLineNo">192</span> // get the children and watch for new children<a name="line.192"></a>
<span class="sourceLineNo">193</span> LOG.debug("Updating watches on tables to archive.");<a name="line.193"></a>
<span class="sourceLineNo">194</span> // get the children and add watches for each of the children<a name="line.194"></a>
<span class="sourceLineNo">195</span> List&lt;String&gt; tables = ZKUtil.listChildrenAndWatchThem(watcher, archiveHFileZNode);<a name="line.195"></a>
<span class="sourceLineNo">196</span> LOG.debug("Starting archive for tables:" + tables);<a name="line.196"></a>
<span class="sourceLineNo">197</span> // if archiving is still enabled<a name="line.197"></a>
<span class="sourceLineNo">198</span> if (tables != null &amp;&amp; tables.size() &gt; 0) {<a name="line.198"></a>
<span class="sourceLineNo">199</span> getMonitor().setArchiveTables(tables);<a name="line.199"></a>
<span class="sourceLineNo">200</span> } else {<a name="line.200"></a>
<span class="sourceLineNo">201</span> LOG.debug("No tables to archive.");<a name="line.201"></a>
<span class="sourceLineNo">202</span> // only if we currently have a tracker, then clear the archive<a name="line.202"></a>
<span class="sourceLineNo">203</span> clearTables();<a name="line.203"></a>
<span class="sourceLineNo">204</span> }<a name="line.204"></a>
<span class="sourceLineNo">205</span> }<a name="line.205"></a>
<span class="sourceLineNo">206</span><a name="line.206"></a>
<span class="sourceLineNo">207</span> /**<a name="line.207"></a>
<span class="sourceLineNo">208</span> * Remove the currently archived tables.<a name="line.208"></a>
<span class="sourceLineNo">209</span> * &lt;p&gt;<a name="line.209"></a>
<span class="sourceLineNo">210</span> * Does some intelligent checking to make sure we don't prematurely create an archive tracker.<a name="line.210"></a>
<span class="sourceLineNo">211</span> */<a name="line.211"></a>
<span class="sourceLineNo">212</span> private void clearTables() {<a name="line.212"></a>
<span class="sourceLineNo">213</span> getMonitor().clearArchive();<a name="line.213"></a>
<span class="sourceLineNo">214</span> }<a name="line.214"></a>
<span class="sourceLineNo">215</span><a name="line.215"></a>
<span class="sourceLineNo">216</span> /**<a name="line.216"></a>
<span class="sourceLineNo">217</span> * Determine if the given table should or should not allow its hfiles to be deleted<a name="line.217"></a>
<span class="sourceLineNo">218</span> * @param tableName name of the table to check<a name="line.218"></a>
<span class="sourceLineNo">219</span> * @return &lt;tt&gt;true&lt;/tt&gt; if its store files should be retained, &lt;tt&gt;false&lt;/tt&gt; otherwise<a name="line.219"></a>
<span class="sourceLineNo">220</span> */<a name="line.220"></a>
<span class="sourceLineNo">221</span> public boolean keepHFiles(String tableName) {<a name="line.221"></a>
<span class="sourceLineNo">222</span> return getMonitor().shouldArchiveTable(tableName);<a name="line.222"></a>
<span class="sourceLineNo">223</span> }<a name="line.223"></a>
<span class="sourceLineNo">224</span><a name="line.224"></a>
<span class="sourceLineNo">225</span> /** Returns the tracker for which tables should be archived. */<a name="line.225"></a>
<span class="sourceLineNo">226</span> public final HFileArchiveTableMonitor getMonitor() {<a name="line.226"></a>
<span class="sourceLineNo">227</span> return this.monitor;<a name="line.227"></a>
<span class="sourceLineNo">228</span> }<a name="line.228"></a>
<span class="sourceLineNo">229</span><a name="line.229"></a>
<span class="sourceLineNo">230</span> /**<a name="line.230"></a>
<span class="sourceLineNo">231</span> * Create an archive tracker for the passed in server<a name="line.231"></a>
<span class="sourceLineNo">232</span> * @param conf to read for zookeeper connection information<a name="line.232"></a>
<span class="sourceLineNo">233</span> * @return ZooKeeper tracker to monitor for this server if this server should archive hfiles for a<a name="line.233"></a>
<span class="sourceLineNo">234</span> * given table<a name="line.234"></a>
<span class="sourceLineNo">235</span> * @throws IOException If a unexpected exception occurs<a name="line.235"></a>
<span class="sourceLineNo">236</span> * @throws ZooKeeperConnectionException if we can't reach zookeeper<a name="line.236"></a>
<span class="sourceLineNo">237</span> */<a name="line.237"></a>
<span class="sourceLineNo">238</span> public static TableHFileArchiveTracker create(Configuration conf)<a name="line.238"></a>
<span class="sourceLineNo">239</span> throws ZooKeeperConnectionException, IOException {<a name="line.239"></a>
<span class="sourceLineNo">240</span> ZKWatcher zkw = new ZKWatcher(conf, "hfileArchiveCleaner", null);<a name="line.240"></a>
<span class="sourceLineNo">241</span> return create(zkw, new HFileArchiveTableMonitor());<a name="line.241"></a>
<span class="sourceLineNo">242</span> }<a name="line.242"></a>
<span class="sourceLineNo">243</span><a name="line.243"></a>
<span class="sourceLineNo">244</span> /**<a name="line.244"></a>
<span class="sourceLineNo">245</span> * Create an archive tracker with the special passed in table monitor. Should only be used in<a name="line.245"></a>
<span class="sourceLineNo">246</span> * special cases (e.g. testing)<a name="line.246"></a>
<span class="sourceLineNo">247</span> * @param zkw Watcher for the ZooKeeper cluster that we should track<a name="line.247"></a>
<span class="sourceLineNo">248</span> * @param monitor Monitor for which tables need hfile archiving<a name="line.248"></a>
<span class="sourceLineNo">249</span> * @return ZooKeeper tracker to monitor for this server if this server should archive hfiles for a<a name="line.249"></a>
<span class="sourceLineNo">250</span> * given table<a name="line.250"></a>
<span class="sourceLineNo">251</span> */<a name="line.251"></a>
<span class="sourceLineNo">252</span> private static TableHFileArchiveTracker create(ZKWatcher zkw, HFileArchiveTableMonitor monitor) {<a name="line.252"></a>
<span class="sourceLineNo">253</span> return new TableHFileArchiveTracker(zkw, monitor);<a name="line.253"></a>
<span class="sourceLineNo">254</span> }<a name="line.254"></a>
<span class="sourceLineNo">255</span><a name="line.255"></a>
<span class="sourceLineNo">256</span> public ZKWatcher getZooKeeperWatcher() {<a name="line.256"></a>
<span class="sourceLineNo">257</span> return this.watcher;<a name="line.257"></a>
<span class="sourceLineNo">258</span> }<a name="line.258"></a>
<span class="sourceLineNo">259</span><a name="line.259"></a>
<span class="sourceLineNo">260</span> /**<a name="line.260"></a>
<span class="sourceLineNo">261</span> * Stop this tracker and the passed zookeeper<a name="line.261"></a>
<span class="sourceLineNo">262</span> */<a name="line.262"></a>
<span class="sourceLineNo">263</span> public void stop() {<a name="line.263"></a>
<span class="sourceLineNo">264</span> if (this.stopped) {<a name="line.264"></a>
<span class="sourceLineNo">265</span> return;<a name="line.265"></a>
<span class="sourceLineNo">266</span> }<a name="line.266"></a>
<span class="sourceLineNo">267</span><a name="line.267"></a>
<span class="sourceLineNo">268</span> this.stopped = true;<a name="line.268"></a>
<span class="sourceLineNo">269</span> this.watcher.close();<a name="line.269"></a>
<span class="sourceLineNo">270</span> }<a name="line.270"></a>
<span class="sourceLineNo">271</span>}<a name="line.271"></a>
</pre>
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