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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.namespace;</span>
<span class="source-line-no">019</span><span id="line-19"></span>
<span class="source-line-no">020</span><span id="line-20">import java.io.IOException;</span>
<span class="source-line-no">021</span><span id="line-21">import java.util.List;</span>
<span class="source-line-no">022</span><span id="line-22">import java.util.concurrent.ConcurrentHashMap;</span>
<span class="source-line-no">023</span><span id="line-23">import java.util.concurrent.ConcurrentMap;</span>
<span class="source-line-no">024</span><span id="line-24">import org.apache.hadoop.hbase.MetaTableAccessor;</span>
<span class="source-line-no">025</span><span id="line-25">import org.apache.hadoop.hbase.NamespaceDescriptor;</span>
<span class="source-line-no">026</span><span id="line-26">import org.apache.hadoop.hbase.TableName;</span>
<span class="source-line-no">027</span><span id="line-27">import org.apache.hadoop.hbase.client.RegionInfo;</span>
<span class="source-line-no">028</span><span id="line-28">import org.apache.hadoop.hbase.master.MasterServices;</span>
<span class="source-line-no">029</span><span id="line-29">import org.apache.hadoop.hbase.master.TableNamespaceManager;</span>
<span class="source-line-no">030</span><span id="line-30">import org.apache.hadoop.hbase.quotas.QuotaExceededException;</span>
<span class="source-line-no">031</span><span id="line-31">import org.apache.hadoop.hbase.util.Bytes;</span>
<span class="source-line-no">032</span><span id="line-32">import org.apache.yetus.audience.InterfaceAudience;</span>
<span class="source-line-no">033</span><span id="line-33">import org.slf4j.Logger;</span>
<span class="source-line-no">034</span><span id="line-34">import org.slf4j.LoggerFactory;</span>
<span class="source-line-no">035</span><span id="line-35"></span>
<span class="source-line-no">036</span><span id="line-36">/**</span>
<span class="source-line-no">037</span><span id="line-37"> * NamespaceStateManager manages state (in terms of quota) of all the namespaces. It contains a</span>
<span class="source-line-no">038</span><span id="line-38"> * cache which is updated based on the hooks in the NamespaceAuditor class.</span>
<span class="source-line-no">039</span><span id="line-39"> */</span>
<span class="source-line-no">040</span><span id="line-40">@InterfaceAudience.Private</span>
<span class="source-line-no">041</span><span id="line-41">class NamespaceStateManager {</span>
<span class="source-line-no">042</span><span id="line-42"></span>
<span class="source-line-no">043</span><span id="line-43"> private static final Logger LOG = LoggerFactory.getLogger(NamespaceStateManager.class);</span>
<span class="source-line-no">044</span><span id="line-44"></span>
<span class="source-line-no">045</span><span id="line-45"> private final ConcurrentMap&lt;String, NamespaceTableAndRegionInfo&gt; nsStateCache;</span>
<span class="source-line-no">046</span><span id="line-46"> private final MasterServices master;</span>
<span class="source-line-no">047</span><span id="line-47"> private volatile boolean initialized = false;</span>
<span class="source-line-no">048</span><span id="line-48"></span>
<span class="source-line-no">049</span><span id="line-49"> public NamespaceStateManager(MasterServices masterServices) {</span>
<span class="source-line-no">050</span><span id="line-50"> nsStateCache = new ConcurrentHashMap&lt;&gt;();</span>
<span class="source-line-no">051</span><span id="line-51"> master = masterServices;</span>
<span class="source-line-no">052</span><span id="line-52"> }</span>
<span class="source-line-no">053</span><span id="line-53"></span>
<span class="source-line-no">054</span><span id="line-54"> /**</span>
<span class="source-line-no">055</span><span id="line-55"> * Starts the NamespaceStateManager. The boot strap of cache is done in the post master start hook</span>
<span class="source-line-no">056</span><span id="line-56"> * of the NamespaceAuditor class.</span>
<span class="source-line-no">057</span><span id="line-57"> * @throws IOException Signals that an I/O exception has occurred.</span>
<span class="source-line-no">058</span><span id="line-58"> */</span>
<span class="source-line-no">059</span><span id="line-59"> public void start() throws IOException {</span>
<span class="source-line-no">060</span><span id="line-60"> LOG.info("Namespace State Manager started.");</span>
<span class="source-line-no">061</span><span id="line-61"> initialize();</span>
<span class="source-line-no">062</span><span id="line-62"> }</span>
<span class="source-line-no">063</span><span id="line-63"></span>
<span class="source-line-no">064</span><span id="line-64"> /**</span>
<span class="source-line-no">065</span><span id="line-65"> * Gets an instance of NamespaceTableAndRegionInfo associated with namespace.</span>
<span class="source-line-no">066</span><span id="line-66"> * @param name The name of the namespace</span>
<span class="source-line-no">067</span><span id="line-67"> * @return An instance of NamespaceTableAndRegionInfo.</span>
<span class="source-line-no">068</span><span id="line-68"> */</span>
<span class="source-line-no">069</span><span id="line-69"> public NamespaceTableAndRegionInfo getState(String name) {</span>
<span class="source-line-no">070</span><span id="line-70"> return nsStateCache.get(name);</span>
<span class="source-line-no">071</span><span id="line-71"> }</span>
<span class="source-line-no">072</span><span id="line-72"></span>
<span class="source-line-no">073</span><span id="line-73"> /**</span>
<span class="source-line-no">074</span><span id="line-74"> * Check if adding a region violates namespace quota, if not update namespace cache.</span>
<span class="source-line-no">075</span><span id="line-75"> * @return true, if region can be added to table.</span>
<span class="source-line-no">076</span><span id="line-76"> * @throws IOException Signals that an I/O exception has occurred.</span>
<span class="source-line-no">077</span><span id="line-77"> */</span>
<span class="source-line-no">078</span><span id="line-78"> synchronized boolean checkAndUpdateNamespaceRegionCount(TableName name, byte[] regionName,</span>
<span class="source-line-no">079</span><span id="line-79"> int incr) throws IOException {</span>
<span class="source-line-no">080</span><span id="line-80"> if (name.isSystemTable()) {</span>
<span class="source-line-no">081</span><span id="line-81"> return true;</span>
<span class="source-line-no">082</span><span id="line-82"> }</span>
<span class="source-line-no">083</span><span id="line-83"> String namespace = name.getNamespaceAsString();</span>
<span class="source-line-no">084</span><span id="line-84"> NamespaceDescriptor nspdesc = getNamespaceDescriptor(namespace);</span>
<span class="source-line-no">085</span><span id="line-85"> if (nspdesc != null) {</span>
<span class="source-line-no">086</span><span id="line-86"> NamespaceTableAndRegionInfo currentStatus;</span>
<span class="source-line-no">087</span><span id="line-87"> currentStatus = getState(namespace);</span>
<span class="source-line-no">088</span><span id="line-88"> int regionCount = currentStatus.getRegionCount();</span>
<span class="source-line-no">089</span><span id="line-89"> long maxRegionCount = TableNamespaceManager.getMaxRegions(nspdesc);</span>
<span class="source-line-no">090</span><span id="line-90"> if (incr &gt; 0 &amp;&amp; regionCount &gt;= maxRegionCount) {</span>
<span class="source-line-no">091</span><span id="line-91"> LOG.warn(</span>
<span class="source-line-no">092</span><span id="line-92"> "The region {} cannot be created. The region count will exceed quota on the namespace. "</span>
<span class="source-line-no">093</span><span id="line-93"> + "This may be transient, please retry later if there are any ongoing split"</span>
<span class="source-line-no">094</span><span id="line-94"> + " operations in the namespace.",</span>
<span class="source-line-no">095</span><span id="line-95"> Bytes.toStringBinary(regionName));</span>
<span class="source-line-no">096</span><span id="line-96"> return false;</span>
<span class="source-line-no">097</span><span id="line-97"> }</span>
<span class="source-line-no">098</span><span id="line-98"> NamespaceTableAndRegionInfo nsInfo = nsStateCache.get(namespace);</span>
<span class="source-line-no">099</span><span id="line-99"> if (nsInfo != null) {</span>
<span class="source-line-no">100</span><span id="line-100"> nsInfo.incRegionCountForTable(name, incr);</span>
<span class="source-line-no">101</span><span id="line-101"> } else {</span>
<span class="source-line-no">102</span><span id="line-102"> LOG.warn("Namespace state found null for namespace : {}", namespace);</span>
<span class="source-line-no">103</span><span id="line-103"> }</span>
<span class="source-line-no">104</span><span id="line-104"> }</span>
<span class="source-line-no">105</span><span id="line-105"> return true;</span>
<span class="source-line-no">106</span><span id="line-106"> }</span>
<span class="source-line-no">107</span><span id="line-107"></span>
<span class="source-line-no">108</span><span id="line-108"> /**</span>
<span class="source-line-no">109</span><span id="line-109"> * Check and update region count for an existing table. To handle scenarios like restore snapshot</span>
<span class="source-line-no">110</span><span id="line-110"> * @param name name of the table for region count needs to be checked and updated</span>
<span class="source-line-no">111</span><span id="line-111"> * @param incr count of regions</span>
<span class="source-line-no">112</span><span id="line-112"> * @throws QuotaExceededException if quota exceeds for the number of regions allowed in a</span>
<span class="source-line-no">113</span><span id="line-113"> * namespace</span>
<span class="source-line-no">114</span><span id="line-114"> * @throws IOException Signals that an I/O exception has occurred.</span>
<span class="source-line-no">115</span><span id="line-115"> */</span>
<span class="source-line-no">116</span><span id="line-116"> synchronized void checkAndUpdateNamespaceRegionCount(TableName name, int incr)</span>
<span class="source-line-no">117</span><span id="line-117"> throws IOException {</span>
<span class="source-line-no">118</span><span id="line-118"> if (name.isSystemTable()) {</span>
<span class="source-line-no">119</span><span id="line-119"> return;</span>
<span class="source-line-no">120</span><span id="line-120"> }</span>
<span class="source-line-no">121</span><span id="line-121"> String namespace = name.getNamespaceAsString();</span>
<span class="source-line-no">122</span><span id="line-122"> NamespaceDescriptor nspdesc = getNamespaceDescriptor(namespace);</span>
<span class="source-line-no">123</span><span id="line-123"> if (nspdesc != null) {</span>
<span class="source-line-no">124</span><span id="line-124"> NamespaceTableAndRegionInfo currentStatus = getState(namespace);</span>
<span class="source-line-no">125</span><span id="line-125"> int regionCountOfTable = currentStatus.getRegionCountOfTable(name);</span>
<span class="source-line-no">126</span><span id="line-126"> if (</span>
<span class="source-line-no">127</span><span id="line-127"> (currentStatus.getRegionCount() - regionCountOfTable + incr)</span>
<span class="source-line-no">128</span><span id="line-128"> &gt; TableNamespaceManager.getMaxRegions(nspdesc)</span>
<span class="source-line-no">129</span><span id="line-129"> ) {</span>
<span class="source-line-no">130</span><span id="line-130"> throw new QuotaExceededException("The table " + name.getNameAsString()</span>
<span class="source-line-no">131</span><span id="line-131"> + " region count cannot be updated as it would exceed maximum number "</span>
<span class="source-line-no">132</span><span id="line-132"> + "of regions allowed in the namespace. The total number of regions permitted is "</span>
<span class="source-line-no">133</span><span id="line-133"> + TableNamespaceManager.getMaxRegions(nspdesc));</span>
<span class="source-line-no">134</span><span id="line-134"> }</span>
<span class="source-line-no">135</span><span id="line-135"> currentStatus.removeTable(name);</span>
<span class="source-line-no">136</span><span id="line-136"> currentStatus.addTable(name, incr);</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"></span>
<span class="source-line-no">140</span><span id="line-140"> private NamespaceDescriptor getNamespaceDescriptor(String namespaceAsString) {</span>
<span class="source-line-no">141</span><span id="line-141"> try {</span>
<span class="source-line-no">142</span><span id="line-142"> return this.master.getClusterSchema().getNamespace(namespaceAsString);</span>
<span class="source-line-no">143</span><span id="line-143"> } catch (IOException e) {</span>
<span class="source-line-no">144</span><span id="line-144"> LOG.error("Error while fetching namespace descriptor for namespace : {}", namespaceAsString);</span>
<span class="source-line-no">145</span><span id="line-145"> return null;</span>
<span class="source-line-no">146</span><span id="line-146"> }</span>
<span class="source-line-no">147</span><span id="line-147"> }</span>
<span class="source-line-no">148</span><span id="line-148"></span>
<span class="source-line-no">149</span><span id="line-149"> synchronized void checkAndUpdateNamespaceTableCount(TableName table, int numRegions)</span>
<span class="source-line-no">150</span><span id="line-150"> throws IOException {</span>
<span class="source-line-no">151</span><span id="line-151"> if (table.isSystemTable()) {</span>
<span class="source-line-no">152</span><span id="line-152"> return;</span>
<span class="source-line-no">153</span><span id="line-153"> }</span>
<span class="source-line-no">154</span><span id="line-154"> String namespace = table.getNamespaceAsString();</span>
<span class="source-line-no">155</span><span id="line-155"> NamespaceDescriptor nspdesc = getNamespaceDescriptor(namespace);</span>
<span class="source-line-no">156</span><span id="line-156"> if (nspdesc != null) {</span>
<span class="source-line-no">157</span><span id="line-157"> NamespaceTableAndRegionInfo currentStatus;</span>
<span class="source-line-no">158</span><span id="line-158"> currentStatus = getState(nspdesc.getName());</span>
<span class="source-line-no">159</span><span id="line-159"> if ((currentStatus.getTables().size()) &gt;= TableNamespaceManager.getMaxTables(nspdesc)) {</span>
<span class="source-line-no">160</span><span id="line-160"> throw new QuotaExceededException("The table " + table.getNameAsString()</span>
<span class="source-line-no">161</span><span id="line-161"> + " cannot be created as it would exceed maximum number of tables allowed "</span>
<span class="source-line-no">162</span><span id="line-162"> + " in the namespace. The total number of tables permitted is "</span>
<span class="source-line-no">163</span><span id="line-163"> + TableNamespaceManager.getMaxTables(nspdesc));</span>
<span class="source-line-no">164</span><span id="line-164"> }</span>
<span class="source-line-no">165</span><span id="line-165"> if (</span>
<span class="source-line-no">166</span><span id="line-166"> (currentStatus.getRegionCount() + numRegions) &gt; TableNamespaceManager.getMaxRegions(nspdesc)</span>
<span class="source-line-no">167</span><span id="line-167"> ) {</span>
<span class="source-line-no">168</span><span id="line-168"> throw new QuotaExceededException(</span>
<span class="source-line-no">169</span><span id="line-169"> "The table " + table.getNameAsString() + " is not allowed to have " + numRegions</span>
<span class="source-line-no">170</span><span id="line-170"> + " regions. The total number of regions permitted is only "</span>
<span class="source-line-no">171</span><span id="line-171"> + TableNamespaceManager.getMaxRegions(nspdesc) + ", while current region count is "</span>
<span class="source-line-no">172</span><span id="line-172"> + currentStatus.getRegionCount()</span>
<span class="source-line-no">173</span><span id="line-173"> + ". This may be transient, please retry later if there are any"</span>
<span class="source-line-no">174</span><span id="line-174"> + " ongoing split operations in the namespace.");</span>
<span class="source-line-no">175</span><span id="line-175"> }</span>
<span class="source-line-no">176</span><span id="line-176"> } else {</span>
<span class="source-line-no">177</span><span id="line-177"> throw new IOException(</span>
<span class="source-line-no">178</span><span id="line-178"> "Namespace Descriptor found null for " + namespace + " This is unexpected.");</span>
<span class="source-line-no">179</span><span id="line-179"> }</span>
<span class="source-line-no">180</span><span id="line-180"> addTable(table, numRegions);</span>
<span class="source-line-no">181</span><span id="line-181"> }</span>
<span class="source-line-no">182</span><span id="line-182"></span>
<span class="source-line-no">183</span><span id="line-183"> NamespaceTableAndRegionInfo addNamespace(String namespace) {</span>
<span class="source-line-no">184</span><span id="line-184"> if (!nsStateCache.containsKey(namespace)) {</span>
<span class="source-line-no">185</span><span id="line-185"> NamespaceTableAndRegionInfo a1 = new NamespaceTableAndRegionInfo(namespace);</span>
<span class="source-line-no">186</span><span id="line-186"> nsStateCache.put(namespace, a1);</span>
<span class="source-line-no">187</span><span id="line-187"> }</span>
<span class="source-line-no">188</span><span id="line-188"> return nsStateCache.get(namespace);</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"> /**</span>
<span class="source-line-no">192</span><span id="line-192"> * Delete the namespace state.</span>
<span class="source-line-no">193</span><span id="line-193"> * @param namespace the name of the namespace to delete</span>
<span class="source-line-no">194</span><span id="line-194"> */</span>
<span class="source-line-no">195</span><span id="line-195"> void deleteNamespace(String namespace) {</span>
<span class="source-line-no">196</span><span id="line-196"> this.nsStateCache.remove(namespace);</span>
<span class="source-line-no">197</span><span id="line-197"> }</span>
<span class="source-line-no">198</span><span id="line-198"></span>
<span class="source-line-no">199</span><span id="line-199"> private void addTable(TableName tableName, int regionCount) throws IOException {</span>
<span class="source-line-no">200</span><span id="line-200"> assert !tableName.isSystemTable() : "Tracking of system tables is not supported";</span>
<span class="source-line-no">201</span><span id="line-201"> NamespaceTableAndRegionInfo info = nsStateCache.get(tableName.getNamespaceAsString());</span>
<span class="source-line-no">202</span><span id="line-202"> if (info != null) {</span>
<span class="source-line-no">203</span><span id="line-203"> info.addTable(tableName, regionCount);</span>
<span class="source-line-no">204</span><span id="line-204"> } else {</span>
<span class="source-line-no">205</span><span id="line-205"> throw new IOException("Bad state : Namespace quota information not found for namespace : "</span>
<span class="source-line-no">206</span><span id="line-206"> + tableName.getNamespaceAsString());</span>
<span class="source-line-no">207</span><span id="line-207"> }</span>
<span class="source-line-no">208</span><span id="line-208"> }</span>
<span class="source-line-no">209</span><span id="line-209"></span>
<span class="source-line-no">210</span><span id="line-210"> synchronized void removeTable(TableName tableName) {</span>
<span class="source-line-no">211</span><span id="line-211"> if (tableName.isSystemTable()) {</span>
<span class="source-line-no">212</span><span id="line-212"> return;</span>
<span class="source-line-no">213</span><span id="line-213"> }</span>
<span class="source-line-no">214</span><span id="line-214"> NamespaceTableAndRegionInfo info = nsStateCache.get(tableName.getNamespaceAsString());</span>
<span class="source-line-no">215</span><span id="line-215"> if (info != null) {</span>
<span class="source-line-no">216</span><span id="line-216"> info.removeTable(tableName);</span>
<span class="source-line-no">217</span><span id="line-217"> }</span>
<span class="source-line-no">218</span><span id="line-218"> }</span>
<span class="source-line-no">219</span><span id="line-219"></span>
<span class="source-line-no">220</span><span id="line-220"> /**</span>
<span class="source-line-no">221</span><span id="line-221"> * Initialize namespace state cache by scanning meta table.</span>
<span class="source-line-no">222</span><span id="line-222"> */</span>
<span class="source-line-no">223</span><span id="line-223"> private void initialize() throws IOException {</span>
<span class="source-line-no">224</span><span id="line-224"> List&lt;NamespaceDescriptor&gt; namespaces = this.master.getClusterSchema().getNamespaces();</span>
<span class="source-line-no">225</span><span id="line-225"> for (NamespaceDescriptor namespace : namespaces) {</span>
<span class="source-line-no">226</span><span id="line-226"> addNamespace(namespace.getName());</span>
<span class="source-line-no">227</span><span id="line-227"> List&lt;TableName&gt; tables = this.master.listTableNamesByNamespace(namespace.getName());</span>
<span class="source-line-no">228</span><span id="line-228"> for (TableName table : tables) {</span>
<span class="source-line-no">229</span><span id="line-229"> if (table.isSystemTable()) {</span>
<span class="source-line-no">230</span><span id="line-230"> continue;</span>
<span class="source-line-no">231</span><span id="line-231"> }</span>
<span class="source-line-no">232</span><span id="line-232"> List&lt;RegionInfo&gt; regions =</span>
<span class="source-line-no">233</span><span id="line-233"> MetaTableAccessor.getTableRegions(this.master.getConnection(), table, true);</span>
<span class="source-line-no">234</span><span id="line-234"> addTable(table, regions.size());</span>
<span class="source-line-no">235</span><span id="line-235"> }</span>
<span class="source-line-no">236</span><span id="line-236"> }</span>
<span class="source-line-no">237</span><span id="line-237"> LOG.info("Finished updating state of {} namespaces.", nsStateCache.size());</span>
<span class="source-line-no">238</span><span id="line-238"> initialized = true;</span>
<span class="source-line-no">239</span><span id="line-239"> }</span>
<span class="source-line-no">240</span><span id="line-240"></span>
<span class="source-line-no">241</span><span id="line-241"> boolean isInitialized() {</span>
<span class="source-line-no">242</span><span id="line-242"> return initialized;</span>
<span class="source-line-no">243</span><span id="line-243"> }</span>
<span class="source-line-no">244</span><span id="line-244"></span>
<span class="source-line-no">245</span><span id="line-245"> public synchronized void removeRegionFromTable(RegionInfo hri) throws IOException {</span>
<span class="source-line-no">246</span><span id="line-246"> String namespace = hri.getTable().getNamespaceAsString();</span>
<span class="source-line-no">247</span><span id="line-247"> NamespaceTableAndRegionInfo nsInfo = nsStateCache.get(namespace);</span>
<span class="source-line-no">248</span><span id="line-248"> if (nsInfo != null) {</span>
<span class="source-line-no">249</span><span id="line-249"> nsInfo.decrementRegionCountForTable(hri.getTable(), 1);</span>
<span class="source-line-no">250</span><span id="line-250"> } else {</span>
<span class="source-line-no">251</span><span id="line-251"> throw new IOException("Namespace state found null for namespace : " + namespace);</span>
<span class="source-line-no">252</span><span id="line-252"> }</span>
<span class="source-line-no">253</span><span id="line-253"> }</span>
<span class="source-line-no">254</span><span id="line-254">}</span>
</pre>
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