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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.zookeeper;</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 static org.apache.hadoop.hbase.HConstants.DEFAULT_ZOOKEEPER_ZNODE_PARENT;</span>
<span class="source-line-no">021</span><span id="line-21">import static org.apache.hadoop.hbase.HConstants.SPLIT_LOGDIR_NAME;</span>
<span class="source-line-no">022</span><span id="line-22">import static org.apache.hadoop.hbase.HConstants.ZOOKEEPER_ZNODE_PARENT;</span>
<span class="source-line-no">023</span><span id="line-23"></span>
<span class="source-line-no">024</span><span id="line-24">import org.apache.hadoop.conf.Configuration;</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.client.RegionInfo;</span>
<span class="source-line-no">027</span><span id="line-27">import org.apache.hadoop.hbase.client.RegionReplicaUtil;</span>
<span class="source-line-no">028</span><span id="line-28">import org.apache.yetus.audience.InterfaceAudience;</span>
<span class="source-line-no">029</span><span id="line-29"></span>
<span class="source-line-no">030</span><span id="line-30">/**</span>
<span class="source-line-no">031</span><span id="line-31"> * Class that hold all the paths of znode for HBase.</span>
<span class="source-line-no">032</span><span id="line-32"> */</span>
<span class="source-line-no">033</span><span id="line-33">@InterfaceAudience.Private</span>
<span class="source-line-no">034</span><span id="line-34">public class ZNodePaths {</span>
<span class="source-line-no">035</span><span id="line-35"> // TODO: Replace this with ZooKeeper constant when ZOOKEEPER-277 is resolved.</span>
<span class="source-line-no">036</span><span id="line-36"> public static final char ZNODE_PATH_SEPARATOR = '/';</span>
<span class="source-line-no">037</span><span id="line-37"></span>
<span class="source-line-no">038</span><span id="line-38"> public static final String META_ZNODE_PREFIX_CONF_KEY = "zookeeper.znode.metaserver";</span>
<span class="source-line-no">039</span><span id="line-39"> public static final String META_ZNODE_PREFIX = "meta-region-server";</span>
<span class="source-line-no">040</span><span id="line-40"> private static final String DEFAULT_SNAPSHOT_CLEANUP_ZNODE = "snapshot-cleanup";</span>
<span class="source-line-no">041</span><span id="line-41"></span>
<span class="source-line-no">042</span><span id="line-42"> // base znode for this cluster</span>
<span class="source-line-no">043</span><span id="line-43"> public final String baseZNode;</span>
<span class="source-line-no">044</span><span id="line-44"></span>
<span class="source-line-no">045</span><span id="line-45"> /**</span>
<span class="source-line-no">046</span><span id="line-46"> * The prefix of meta znode. Does not include baseZNode. Its a 'prefix' because meta replica id</span>
<span class="source-line-no">047</span><span id="line-47"> * integer can be tagged on the end (if no number present, it is 'default' replica).</span>
<span class="source-line-no">048</span><span id="line-48"> */</span>
<span class="source-line-no">049</span><span id="line-49"> private final String metaZNodePrefix;</span>
<span class="source-line-no">050</span><span id="line-50"></span>
<span class="source-line-no">051</span><span id="line-51"> // znode containing ephemeral nodes of the regionservers</span>
<span class="source-line-no">052</span><span id="line-52"> public final String rsZNode;</span>
<span class="source-line-no">053</span><span id="line-53"> // znode containing ephemeral nodes of the draining regionservers</span>
<span class="source-line-no">054</span><span id="line-54"> public final String drainingZNode;</span>
<span class="source-line-no">055</span><span id="line-55"> // znode of currently active master</span>
<span class="source-line-no">056</span><span id="line-56"> public final String masterAddressZNode;</span>
<span class="source-line-no">057</span><span id="line-57"> // znode of this master in backup master directory, if not the active master</span>
<span class="source-line-no">058</span><span id="line-58"> public final String backupMasterAddressesZNode;</span>
<span class="source-line-no">059</span><span id="line-59"> // znode containing the current cluster state</span>
<span class="source-line-no">060</span><span id="line-60"> public final String clusterStateZNode;</span>
<span class="source-line-no">061</span><span id="line-61"> // znode used for table disabling/enabling</span>
<span class="source-line-no">062</span><span id="line-62"> // Still used in hbase2 by MirroringTableStateManager; it mirrors internal table state out to</span>
<span class="source-line-no">063</span><span id="line-63"> // zookeeper for hbase1 clients to make use of. If no hbase1 clients disable. See</span>
<span class="source-line-no">064</span><span id="line-64"> // MirroringTableStateManager. To be removed in hbase3.</span>
<span class="source-line-no">065</span><span id="line-65"> @Deprecated</span>
<span class="source-line-no">066</span><span id="line-66"> public final String tableZNode;</span>
<span class="source-line-no">067</span><span id="line-67"> // znode containing the unique cluster ID</span>
<span class="source-line-no">068</span><span id="line-68"> public final String clusterIdZNode;</span>
<span class="source-line-no">069</span><span id="line-69"> // znode used for log splitting work assignment</span>
<span class="source-line-no">070</span><span id="line-70"> public final String splitLogZNode;</span>
<span class="source-line-no">071</span><span id="line-71"> // znode containing the state of the load balancer</span>
<span class="source-line-no">072</span><span id="line-72"> /**</span>
<span class="source-line-no">073</span><span id="line-73"> * @deprecated Since 2.6.0, will be removed in 4.0.0. We use master local region to store this</span>
<span class="source-line-no">074</span><span id="line-74"> * state.</span>
<span class="source-line-no">075</span><span id="line-75"> */</span>
<span class="source-line-no">076</span><span id="line-76"> @Deprecated</span>
<span class="source-line-no">077</span><span id="line-77"> public final String balancerZNode;</span>
<span class="source-line-no">078</span><span id="line-78"> // znode containing the state of region normalizer</span>
<span class="source-line-no">079</span><span id="line-79"> /**</span>
<span class="source-line-no">080</span><span id="line-80"> * @deprecated Since 2.6.0, will be removed in 4.0.0. We use master local region to store this</span>
<span class="source-line-no">081</span><span id="line-81"> * state.</span>
<span class="source-line-no">082</span><span id="line-82"> */</span>
<span class="source-line-no">083</span><span id="line-83"> @Deprecated</span>
<span class="source-line-no">084</span><span id="line-84"> public final String regionNormalizerZNode;</span>
<span class="source-line-no">085</span><span id="line-85"> // znode containing the state of all switches, currently there are split and merge child node.</span>
<span class="source-line-no">086</span><span id="line-86"> /**</span>
<span class="source-line-no">087</span><span id="line-87"> * @deprecated Since 2.6.0, will be removed in 4.0.0. We use master local region to store this</span>
<span class="source-line-no">088</span><span id="line-88"> * state.</span>
<span class="source-line-no">089</span><span id="line-89"> */</span>
<span class="source-line-no">090</span><span id="line-90"> @Deprecated</span>
<span class="source-line-no">091</span><span id="line-91"> public final String switchZNode;</span>
<span class="source-line-no">092</span><span id="line-92"> // znode of indicating master maintenance mode</span>
<span class="source-line-no">093</span><span id="line-93"> public final String masterMaintZNode;</span>
<span class="source-line-no">094</span><span id="line-94"></span>
<span class="source-line-no">095</span><span id="line-95"> // znode containing all replication state.</span>
<span class="source-line-no">096</span><span id="line-96"> public final String replicationZNode;</span>
<span class="source-line-no">097</span><span id="line-97"> // znode containing a list of all remote slave (i.e. peer) clusters.</span>
<span class="source-line-no">098</span><span id="line-98"> public final String peersZNode;</span>
<span class="source-line-no">099</span><span id="line-99"> // znode containing all replication queues</span>
<span class="source-line-no">100</span><span id="line-100"> public final String queuesZNode;</span>
<span class="source-line-no">101</span><span id="line-101"> // znode containing queues of hfile references to be replicated</span>
<span class="source-line-no">102</span><span id="line-102"> public final String hfileRefsZNode;</span>
<span class="source-line-no">103</span><span id="line-103"> // znode containing the state of the snapshot auto-cleanup</span>
<span class="source-line-no">104</span><span id="line-104"> /**</span>
<span class="source-line-no">105</span><span id="line-105"> * @deprecated Since 2.6.0, will be removed in 4.0.0. We use master local region to store this</span>
<span class="source-line-no">106</span><span id="line-106"> * state.</span>
<span class="source-line-no">107</span><span id="line-107"> */</span>
<span class="source-line-no">108</span><span id="line-108"> @Deprecated</span>
<span class="source-line-no">109</span><span id="line-109"> public final String snapshotCleanupZNode;</span>
<span class="source-line-no">110</span><span id="line-110"></span>
<span class="source-line-no">111</span><span id="line-111"> public ZNodePaths(Configuration conf) {</span>
<span class="source-line-no">112</span><span id="line-112"> baseZNode = conf.get(ZOOKEEPER_ZNODE_PARENT, DEFAULT_ZOOKEEPER_ZNODE_PARENT);</span>
<span class="source-line-no">113</span><span id="line-113"> metaZNodePrefix = conf.get(META_ZNODE_PREFIX_CONF_KEY, META_ZNODE_PREFIX);</span>
<span class="source-line-no">114</span><span id="line-114"> rsZNode = joinZNode(baseZNode, conf.get("zookeeper.znode.rs", "rs"));</span>
<span class="source-line-no">115</span><span id="line-115"> drainingZNode = joinZNode(baseZNode, conf.get("zookeeper.znode.draining.rs", "draining"));</span>
<span class="source-line-no">116</span><span id="line-116"> masterAddressZNode = joinZNode(baseZNode, conf.get("zookeeper.znode.master", "master"));</span>
<span class="source-line-no">117</span><span id="line-117"> backupMasterAddressesZNode =</span>
<span class="source-line-no">118</span><span id="line-118"> joinZNode(baseZNode, conf.get("zookeeper.znode.backup.masters", "backup-masters"));</span>
<span class="source-line-no">119</span><span id="line-119"> clusterStateZNode = joinZNode(baseZNode, conf.get("zookeeper.znode.state", "running"));</span>
<span class="source-line-no">120</span><span id="line-120"> tableZNode = joinZNode(baseZNode, conf.get("zookeeper.znode.tableEnableDisable", "table"));</span>
<span class="source-line-no">121</span><span id="line-121"> clusterIdZNode = joinZNode(baseZNode, conf.get("zookeeper.znode.clusterId", "hbaseid"));</span>
<span class="source-line-no">122</span><span id="line-122"> splitLogZNode = joinZNode(baseZNode, conf.get("zookeeper.znode.splitlog", SPLIT_LOGDIR_NAME));</span>
<span class="source-line-no">123</span><span id="line-123"> balancerZNode = joinZNode(baseZNode, conf.get("zookeeper.znode.balancer", "balancer"));</span>
<span class="source-line-no">124</span><span id="line-124"> regionNormalizerZNode =</span>
<span class="source-line-no">125</span><span id="line-125"> joinZNode(baseZNode, conf.get("zookeeper.znode.regionNormalizer", "normalizer"));</span>
<span class="source-line-no">126</span><span id="line-126"> switchZNode = joinZNode(baseZNode, conf.get("zookeeper.znode.switch", "switch"));</span>
<span class="source-line-no">127</span><span id="line-127"> masterMaintZNode =</span>
<span class="source-line-no">128</span><span id="line-128"> joinZNode(baseZNode, conf.get("zookeeper.znode.masterMaintenance", "master-maintenance"));</span>
<span class="source-line-no">129</span><span id="line-129"> replicationZNode = joinZNode(baseZNode, conf.get("zookeeper.znode.replication", "replication"));</span>
<span class="source-line-no">130</span><span id="line-130"> peersZNode =</span>
<span class="source-line-no">131</span><span id="line-131"> joinZNode(replicationZNode, conf.get("zookeeper.znode.replication.peers", "peers"));</span>
<span class="source-line-no">132</span><span id="line-132"> queuesZNode = joinZNode(replicationZNode, conf.get("zookeeper.znode.replication.rs", "rs"));</span>
<span class="source-line-no">133</span><span id="line-133"> hfileRefsZNode =</span>
<span class="source-line-no">134</span><span id="line-134"> joinZNode(replicationZNode, conf.get("zookeeper.znode.replication.hfile.refs", "hfile-refs"));</span>
<span class="source-line-no">135</span><span id="line-135"> snapshotCleanupZNode = joinZNode(baseZNode,</span>
<span class="source-line-no">136</span><span id="line-136"> conf.get("zookeeper.znode.snapshot.cleanup", DEFAULT_SNAPSHOT_CLEANUP_ZNODE));</span>
<span class="source-line-no">137</span><span id="line-137"> }</span>
<span class="source-line-no">138</span><span id="line-138"></span>
<span class="source-line-no">139</span><span id="line-139"> @Override</span>
<span class="source-line-no">140</span><span id="line-140"> public String toString() {</span>
<span class="source-line-no">141</span><span id="line-141"> return new StringBuilder().append("ZNodePaths [baseZNode=").append(baseZNode)</span>
<span class="source-line-no">142</span><span id="line-142"> .append(", rsZNode=").append(rsZNode).append(", drainingZNode=").append(drainingZNode)</span>
<span class="source-line-no">143</span><span id="line-143"> .append(", masterAddressZNode=").append(masterAddressZNode)</span>
<span class="source-line-no">144</span><span id="line-144"> .append(", backupMasterAddressesZNode=").append(backupMasterAddressesZNode)</span>
<span class="source-line-no">145</span><span id="line-145"> .append(", clusterStateZNode=").append(clusterStateZNode).append(", tableZNode=")</span>
<span class="source-line-no">146</span><span id="line-146"> .append(tableZNode).append(", clusterIdZNode=").append(clusterIdZNode)</span>
<span class="source-line-no">147</span><span id="line-147"> .append(", splitLogZNode=").append(splitLogZNode).append(", balancerZNode=")</span>
<span class="source-line-no">148</span><span id="line-148"> .append(balancerZNode).append(", regionNormalizerZNode=").append(regionNormalizerZNode)</span>
<span class="source-line-no">149</span><span id="line-149"> .append(", switchZNode=").append(switchZNode).append(", masterMaintZNode=")</span>
<span class="source-line-no">150</span><span id="line-150"> .append(masterMaintZNode).append(", replicationZNode=").append(replicationZNode)</span>
<span class="source-line-no">151</span><span id="line-151"> .append(", peersZNode=").append(peersZNode).append(", queuesZNode=").append(queuesZNode)</span>
<span class="source-line-no">152</span><span id="line-152"> .append(", hfileRefsZNode=").append(hfileRefsZNode).append(", snapshotCleanupZNode=")</span>
<span class="source-line-no">153</span><span id="line-153"> .append(snapshotCleanupZNode).append("]").toString();</span>
<span class="source-line-no">154</span><span id="line-154"> }</span>
<span class="source-line-no">155</span><span id="line-155"></span>
<span class="source-line-no">156</span><span id="line-156"> /** Returns the znode string corresponding to a replicaId */</span>
<span class="source-line-no">157</span><span id="line-157"> public String getZNodeForReplica(int replicaId) {</span>
<span class="source-line-no">158</span><span id="line-158"> if (RegionReplicaUtil.isDefaultReplica(replicaId)) {</span>
<span class="source-line-no">159</span><span id="line-159"> return joinZNode(baseZNode, metaZNodePrefix);</span>
<span class="source-line-no">160</span><span id="line-160"> } else {</span>
<span class="source-line-no">161</span><span id="line-161"> return joinZNode(baseZNode, metaZNodePrefix + "-" + replicaId);</span>
<span class="source-line-no">162</span><span id="line-162"> }</span>
<span class="source-line-no">163</span><span id="line-163"> }</span>
<span class="source-line-no">164</span><span id="line-164"></span>
<span class="source-line-no">165</span><span id="line-165"> /**</span>
<span class="source-line-no">166</span><span id="line-166"> * Parses the meta replicaId from the passed path.</span>
<span class="source-line-no">167</span><span id="line-167"> * @param path the name of the full path which includes baseZNode.</span>
<span class="source-line-no">168</span><span id="line-168"> */</span>
<span class="source-line-no">169</span><span id="line-169"> public int getMetaReplicaIdFromPath(String path) {</span>
<span class="source-line-no">170</span><span id="line-170"> // Extract the znode from path. The prefix is of the following format.</span>
<span class="source-line-no">171</span><span id="line-171"> // baseZNode + PATH_SEPARATOR.</span>
<span class="source-line-no">172</span><span id="line-172"> int prefixLen = baseZNode.length() + 1;</span>
<span class="source-line-no">173</span><span id="line-173"> return getMetaReplicaIdFromZNode(path.substring(prefixLen));</span>
<span class="source-line-no">174</span><span id="line-174"> }</span>
<span class="source-line-no">175</span><span id="line-175"></span>
<span class="source-line-no">176</span><span id="line-176"> /**</span>
<span class="source-line-no">177</span><span id="line-177"> * Parse the meta replicaId from the passed znode</span>
<span class="source-line-no">178</span><span id="line-178"> * @param znode the name of the znode, does not include baseZNode</span>
<span class="source-line-no">179</span><span id="line-179"> */</span>
<span class="source-line-no">180</span><span id="line-180"> public int getMetaReplicaIdFromZNode(String znode) {</span>
<span class="source-line-no">181</span><span id="line-181"> return znode.equals(metaZNodePrefix)</span>
<span class="source-line-no">182</span><span id="line-182"> ? RegionInfo.DEFAULT_REPLICA_ID</span>
<span class="source-line-no">183</span><span id="line-183"> : Integer.parseInt(znode.substring(metaZNodePrefix.length() + 1));</span>
<span class="source-line-no">184</span><span id="line-184"> }</span>
<span class="source-line-no">185</span><span id="line-185"></span>
<span class="source-line-no">186</span><span id="line-186"> /** Returns True if meta znode. */</span>
<span class="source-line-no">187</span><span id="line-187"> public boolean isMetaZNodePrefix(String znode) {</span>
<span class="source-line-no">188</span><span id="line-188"> return znode != null &amp;&amp; znode.startsWith(this.metaZNodePrefix);</span>
<span class="source-line-no">189</span><span id="line-189"> }</span>
<span class="source-line-no">190</span><span id="line-190"></span>
<span class="source-line-no">191</span><span id="line-191"> /** Returns True is the fully qualified path is for meta location */</span>
<span class="source-line-no">192</span><span id="line-192"> public boolean isMetaZNodePath(String path) {</span>
<span class="source-line-no">193</span><span id="line-193"> int prefixLen = baseZNode.length() + 1;</span>
<span class="source-line-no">194</span><span id="line-194"> return path.length() &gt; prefixLen &amp;&amp; isMetaZNodePrefix(path.substring(prefixLen));</span>
<span class="source-line-no">195</span><span id="line-195"> }</span>
<span class="source-line-no">196</span><span id="line-196"></span>
<span class="source-line-no">197</span><span id="line-197"> /**</span>
<span class="source-line-no">198</span><span id="line-198"> * Returns whether the path is supposed to be readable by the client and DOES NOT contain</span>
<span class="source-line-no">199</span><span id="line-199"> * sensitive information (world readable).</span>
<span class="source-line-no">200</span><span id="line-200"> */</span>
<span class="source-line-no">201</span><span id="line-201"> public boolean isClientReadable(String path) {</span>
<span class="source-line-no">202</span><span id="line-202"> // Developer notice: These znodes are world readable. DO NOT add more znodes here UNLESS</span>
<span class="source-line-no">203</span><span id="line-203"> // all clients need to access this data to work. Using zk for sharing data to clients (other</span>
<span class="source-line-no">204</span><span id="line-204"> // than service lookup case is not a recommended design pattern.</span>
<span class="source-line-no">205</span><span id="line-205"> return path.equals(baseZNode) || isMetaZNodePath(path) || path.equals(masterAddressZNode)</span>
<span class="source-line-no">206</span><span id="line-206"> || path.equals(clusterIdZNode) || path.equals(rsZNode) ||</span>
<span class="source-line-no">207</span><span id="line-207"> // /hbase/table and /hbase/table/foo is allowed, /hbase/table-lock is not</span>
<span class="source-line-no">208</span><span id="line-208"> path.equals(tableZNode) || path.startsWith(tableZNode + "/");</span>
<span class="source-line-no">209</span><span id="line-209"> }</span>
<span class="source-line-no">210</span><span id="line-210"></span>
<span class="source-line-no">211</span><span id="line-211"> public String getRsPath(ServerName sn) {</span>
<span class="source-line-no">212</span><span id="line-212"> return joinZNode(rsZNode, sn.toString());</span>
<span class="source-line-no">213</span><span id="line-213"> }</span>
<span class="source-line-no">214</span><span id="line-214"></span>
<span class="source-line-no">215</span><span id="line-215"> /**</span>
<span class="source-line-no">216</span><span id="line-216"> * Join the prefix znode name with the suffix znode name to generate a proper full znode name.</span>
<span class="source-line-no">217</span><span id="line-217"> * &lt;p&gt;</span>
<span class="source-line-no">218</span><span id="line-218"> * Assumes prefix does not end with slash and suffix does not begin with it.</span>
<span class="source-line-no">219</span><span id="line-219"> * @param prefix beginning of znode name</span>
<span class="source-line-no">220</span><span id="line-220"> * @param suffix ending of znode name</span>
<span class="source-line-no">221</span><span id="line-221"> * @return result of properly joining prefix with suffix</span>
<span class="source-line-no">222</span><span id="line-222"> */</span>
<span class="source-line-no">223</span><span id="line-223"> public static String joinZNode(String prefix, String... suffix) {</span>
<span class="source-line-no">224</span><span id="line-224"> StringBuilder sb = new StringBuilder(prefix);</span>
<span class="source-line-no">225</span><span id="line-225"> for (String s : suffix) {</span>
<span class="source-line-no">226</span><span id="line-226"> sb.append(ZNodePaths.ZNODE_PATH_SEPARATOR).append(s);</span>
<span class="source-line-no">227</span><span id="line-227"> }</span>
<span class="source-line-no">228</span><span id="line-228"> return sb.toString();</span>
<span class="source-line-no">229</span><span id="line-229"> }</span>
<span class="source-line-no">230</span><span id="line-230">}</span>
</pre>
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