blob: 1869c14bfb31d1cc6cd6f9569c304a9f06a3976e [file] [log] [blame]
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html lang="en">
<head>
<title>Source code</title>
<link rel="stylesheet" type="text/css" href="../../../../../../stylesheet.css" title="Style">
</head>
<body>
<div class="sourceContainer">
<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> *<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.3"></a>
<span class="sourceLineNo">004</span> * or more contributor license agreements. See the NOTICE file<a name="line.4"></a>
<span class="sourceLineNo">005</span> * distributed with this work for additional information<a name="line.5"></a>
<span class="sourceLineNo">006</span> * regarding copyright ownership. The ASF licenses this file<a name="line.6"></a>
<span class="sourceLineNo">007</span> * to you under the Apache License, Version 2.0 (the<a name="line.7"></a>
<span class="sourceLineNo">008</span> * "License"); you may not use this file except in compliance<a name="line.8"></a>
<span class="sourceLineNo">009</span> * with the License. You may obtain a copy of the License at<a name="line.9"></a>
<span class="sourceLineNo">010</span> *<a name="line.10"></a>
<span class="sourceLineNo">011</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.11"></a>
<span class="sourceLineNo">012</span> *<a name="line.12"></a>
<span class="sourceLineNo">013</span> * Unless required by applicable law or agreed to in writing, software<a name="line.13"></a>
<span class="sourceLineNo">014</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.14"></a>
<span class="sourceLineNo">015</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.15"></a>
<span class="sourceLineNo">016</span> * See the License for the specific language governing permissions and<a name="line.16"></a>
<span class="sourceLineNo">017</span> * limitations under the License.<a name="line.17"></a>
<span class="sourceLineNo">018</span> */<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>package org.apache.hadoop.hbase.coprocessor;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.io.IOException;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.util.HashSet;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.util.List;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.util.Optional;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import java.util.Set;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import org.apache.commons.lang3.StringUtils;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import org.apache.hadoop.conf.Configuration;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import org.apache.hadoop.hbase.Cell;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.CoprocessorEnvironment;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.TableName;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.client.Delete;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import org.apache.hadoop.hbase.client.Durability;<a name="line.33"></a>
<span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.client.Get;<a name="line.34"></a>
<span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.client.Put;<a name="line.35"></a>
<span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.client.Row;<a name="line.36"></a>
<span class="sourceLineNo">037</span>import org.apache.hadoop.hbase.ipc.RpcServer;<a name="line.37"></a>
<span class="sourceLineNo">038</span>import org.apache.hadoop.hbase.metrics.MetricRegistry;<a name="line.38"></a>
<span class="sourceLineNo">039</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.39"></a>
<span class="sourceLineNo">040</span>import org.apache.hadoop.hbase.util.LossyCounting;<a name="line.40"></a>
<span class="sourceLineNo">041</span>import org.apache.hadoop.hbase.wal.WALEdit;<a name="line.41"></a>
<span class="sourceLineNo">042</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.42"></a>
<span class="sourceLineNo">043</span>import org.apache.hbase.thirdparty.com.google.common.collect.ImmutableMap;<a name="line.43"></a>
<span class="sourceLineNo">044</span><a name="line.44"></a>
<span class="sourceLineNo">045</span>/**<a name="line.45"></a>
<span class="sourceLineNo">046</span> * A coprocessor that collects metrics from meta table.<a name="line.46"></a>
<span class="sourceLineNo">047</span> * &lt;p&gt;<a name="line.47"></a>
<span class="sourceLineNo">048</span> * These metrics will be available through the regular Hadoop metrics2 sinks (ganglia, opentsdb,<a name="line.48"></a>
<span class="sourceLineNo">049</span> * etc) as well as JMX output.<a name="line.49"></a>
<span class="sourceLineNo">050</span> * &lt;/p&gt;<a name="line.50"></a>
<span class="sourceLineNo">051</span> * @see MetaTableMetrics<a name="line.51"></a>
<span class="sourceLineNo">052</span> */<a name="line.52"></a>
<span class="sourceLineNo">053</span><a name="line.53"></a>
<span class="sourceLineNo">054</span>@InterfaceAudience.Private<a name="line.54"></a>
<span class="sourceLineNo">055</span>public class MetaTableMetrics implements RegionCoprocessor {<a name="line.55"></a>
<span class="sourceLineNo">056</span><a name="line.56"></a>
<span class="sourceLineNo">057</span> private ExampleRegionObserverMeta observer;<a name="line.57"></a>
<span class="sourceLineNo">058</span> private MetricRegistry registry;<a name="line.58"></a>
<span class="sourceLineNo">059</span> private LossyCounting&lt;String&gt; clientMetricsLossyCounting, regionMetricsLossyCounting;<a name="line.59"></a>
<span class="sourceLineNo">060</span> private boolean active = false;<a name="line.60"></a>
<span class="sourceLineNo">061</span> private Set&lt;String&gt; metrics = new HashSet&lt;&gt;();<a name="line.61"></a>
<span class="sourceLineNo">062</span><a name="line.62"></a>
<span class="sourceLineNo">063</span> enum MetaTableOps {<a name="line.63"></a>
<span class="sourceLineNo">064</span> GET, PUT, DELETE,<a name="line.64"></a>
<span class="sourceLineNo">065</span> }<a name="line.65"></a>
<span class="sourceLineNo">066</span><a name="line.66"></a>
<span class="sourceLineNo">067</span> private ImmutableMap&lt;Class&lt;? extends Row&gt;, MetaTableOps&gt; opsNameMap =<a name="line.67"></a>
<span class="sourceLineNo">068</span> ImmutableMap.&lt;Class&lt;? extends Row&gt;, MetaTableOps&gt;builder()<a name="line.68"></a>
<span class="sourceLineNo">069</span> .put(Put.class, MetaTableOps.PUT)<a name="line.69"></a>
<span class="sourceLineNo">070</span> .put(Get.class, MetaTableOps.GET)<a name="line.70"></a>
<span class="sourceLineNo">071</span> .put(Delete.class, MetaTableOps.DELETE)<a name="line.71"></a>
<span class="sourceLineNo">072</span> .build();<a name="line.72"></a>
<span class="sourceLineNo">073</span><a name="line.73"></a>
<span class="sourceLineNo">074</span> class ExampleRegionObserverMeta implements RegionCoprocessor, RegionObserver {<a name="line.74"></a>
<span class="sourceLineNo">075</span><a name="line.75"></a>
<span class="sourceLineNo">076</span> @Override<a name="line.76"></a>
<span class="sourceLineNo">077</span> public Optional&lt;RegionObserver&gt; getRegionObserver() {<a name="line.77"></a>
<span class="sourceLineNo">078</span> return Optional.of(this);<a name="line.78"></a>
<span class="sourceLineNo">079</span> }<a name="line.79"></a>
<span class="sourceLineNo">080</span><a name="line.80"></a>
<span class="sourceLineNo">081</span> @Override<a name="line.81"></a>
<span class="sourceLineNo">082</span> public void preGetOp(ObserverContext&lt;RegionCoprocessorEnvironment&gt; e, Get get,<a name="line.82"></a>
<span class="sourceLineNo">083</span> List&lt;Cell&gt; results) throws IOException {<a name="line.83"></a>
<span class="sourceLineNo">084</span> registerAndMarkMetrics(e, get);<a name="line.84"></a>
<span class="sourceLineNo">085</span> }<a name="line.85"></a>
<span class="sourceLineNo">086</span><a name="line.86"></a>
<span class="sourceLineNo">087</span> @Override<a name="line.87"></a>
<span class="sourceLineNo">088</span> public void prePut(ObserverContext&lt;RegionCoprocessorEnvironment&gt; e, Put put, WALEdit edit,<a name="line.88"></a>
<span class="sourceLineNo">089</span> Durability durability) throws IOException {<a name="line.89"></a>
<span class="sourceLineNo">090</span> registerAndMarkMetrics(e, put);<a name="line.90"></a>
<span class="sourceLineNo">091</span> }<a name="line.91"></a>
<span class="sourceLineNo">092</span><a name="line.92"></a>
<span class="sourceLineNo">093</span> @Override<a name="line.93"></a>
<span class="sourceLineNo">094</span> public void preDelete(ObserverContext&lt;RegionCoprocessorEnvironment&gt; e, Delete delete,<a name="line.94"></a>
<span class="sourceLineNo">095</span> WALEdit edit, Durability durability) {<a name="line.95"></a>
<span class="sourceLineNo">096</span> registerAndMarkMetrics(e, delete);<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> private void registerAndMarkMetrics(ObserverContext&lt;RegionCoprocessorEnvironment&gt; e, Row row){<a name="line.99"></a>
<span class="sourceLineNo">100</span> if (!active || !isMetaTableOp(e)) {<a name="line.100"></a>
<span class="sourceLineNo">101</span> return;<a name="line.101"></a>
<span class="sourceLineNo">102</span> }<a name="line.102"></a>
<span class="sourceLineNo">103</span> tableMetricRegisterAndMark(row);<a name="line.103"></a>
<span class="sourceLineNo">104</span> clientMetricRegisterAndMark();<a name="line.104"></a>
<span class="sourceLineNo">105</span> regionMetricRegisterAndMark(row);<a name="line.105"></a>
<span class="sourceLineNo">106</span> opMetricRegisterAndMark(row);<a name="line.106"></a>
<span class="sourceLineNo">107</span> opWithClientMetricRegisterAndMark(row);<a name="line.107"></a>
<span class="sourceLineNo">108</span> }<a name="line.108"></a>
<span class="sourceLineNo">109</span><a name="line.109"></a>
<span class="sourceLineNo">110</span> /**<a name="line.110"></a>
<span class="sourceLineNo">111</span> * Get table name from Ops such as: get, put, delete.<a name="line.111"></a>
<span class="sourceLineNo">112</span> * @param op such as get, put or delete.<a name="line.112"></a>
<span class="sourceLineNo">113</span> */<a name="line.113"></a>
<span class="sourceLineNo">114</span> private String getTableNameFromOp(Row op) {<a name="line.114"></a>
<span class="sourceLineNo">115</span> final String tableRowKey = Bytes.toString(op.getRow());<a name="line.115"></a>
<span class="sourceLineNo">116</span> if (StringUtils.isEmpty(tableRowKey)) {<a name="line.116"></a>
<span class="sourceLineNo">117</span> return null;<a name="line.117"></a>
<span class="sourceLineNo">118</span> }<a name="line.118"></a>
<span class="sourceLineNo">119</span> final String[] splits = tableRowKey.split(",");<a name="line.119"></a>
<span class="sourceLineNo">120</span> return splits.length &gt; 0 ? splits[0] : null;<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> * Get regionId from Ops such as: get, put, delete.<a name="line.124"></a>
<span class="sourceLineNo">125</span> * @param op such as get, put or delete.<a name="line.125"></a>
<span class="sourceLineNo">126</span> */<a name="line.126"></a>
<span class="sourceLineNo">127</span> private String getRegionIdFromOp(Row op) {<a name="line.127"></a>
<span class="sourceLineNo">128</span> final String tableRowKey = Bytes.toString(op.getRow());<a name="line.128"></a>
<span class="sourceLineNo">129</span> if (StringUtils.isEmpty(tableRowKey)) {<a name="line.129"></a>
<span class="sourceLineNo">130</span> return null;<a name="line.130"></a>
<span class="sourceLineNo">131</span> }<a name="line.131"></a>
<span class="sourceLineNo">132</span> final String[] splits = tableRowKey.split(",");<a name="line.132"></a>
<span class="sourceLineNo">133</span> return splits.length &gt; 2 ? splits[2] : null;<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> private boolean isMetaTableOp(ObserverContext&lt;RegionCoprocessorEnvironment&gt; e) {<a name="line.136"></a>
<span class="sourceLineNo">137</span> return TableName.META_TABLE_NAME<a name="line.137"></a>
<span class="sourceLineNo">138</span> .equals(e.getEnvironment().getRegionInfo().getTable());<a name="line.138"></a>
<span class="sourceLineNo">139</span> }<a name="line.139"></a>
<span class="sourceLineNo">140</span><a name="line.140"></a>
<span class="sourceLineNo">141</span> private void clientMetricRegisterAndMark() {<a name="line.141"></a>
<span class="sourceLineNo">142</span> // Mark client metric<a name="line.142"></a>
<span class="sourceLineNo">143</span> String clientIP = RpcServer.getRemoteIp() != null ? RpcServer.getRemoteIp().toString() : null;<a name="line.143"></a>
<span class="sourceLineNo">144</span> if (clientIP == null || clientIP.isEmpty()) {<a name="line.144"></a>
<span class="sourceLineNo">145</span> return;<a name="line.145"></a>
<span class="sourceLineNo">146</span> }<a name="line.146"></a>
<span class="sourceLineNo">147</span> String clientRequestMeter = clientRequestMeterName(clientIP);<a name="line.147"></a>
<span class="sourceLineNo">148</span> clientMetricsLossyCounting.add(clientRequestMeter);<a name="line.148"></a>
<span class="sourceLineNo">149</span> registerAndMarkMeter(clientRequestMeter);<a name="line.149"></a>
<span class="sourceLineNo">150</span> }<a name="line.150"></a>
<span class="sourceLineNo">151</span><a name="line.151"></a>
<span class="sourceLineNo">152</span> private void tableMetricRegisterAndMark(Row op) {<a name="line.152"></a>
<span class="sourceLineNo">153</span> // Mark table metric<a name="line.153"></a>
<span class="sourceLineNo">154</span> String tableName = getTableNameFromOp(op);<a name="line.154"></a>
<span class="sourceLineNo">155</span> if (tableName == null || tableName.isEmpty()) {<a name="line.155"></a>
<span class="sourceLineNo">156</span> return;<a name="line.156"></a>
<span class="sourceLineNo">157</span> }<a name="line.157"></a>
<span class="sourceLineNo">158</span> String tableRequestMeter = tableMeterName(tableName);<a name="line.158"></a>
<span class="sourceLineNo">159</span> registerAndMarkMeter(tableRequestMeter);<a name="line.159"></a>
<span class="sourceLineNo">160</span> }<a name="line.160"></a>
<span class="sourceLineNo">161</span><a name="line.161"></a>
<span class="sourceLineNo">162</span> private void regionMetricRegisterAndMark(Row op) {<a name="line.162"></a>
<span class="sourceLineNo">163</span> // Mark region metric<a name="line.163"></a>
<span class="sourceLineNo">164</span> String regionId = getRegionIdFromOp(op);<a name="line.164"></a>
<span class="sourceLineNo">165</span> if (regionId == null || regionId.isEmpty()) {<a name="line.165"></a>
<span class="sourceLineNo">166</span> return;<a name="line.166"></a>
<span class="sourceLineNo">167</span> }<a name="line.167"></a>
<span class="sourceLineNo">168</span> String regionRequestMeter = regionMeterName(regionId);<a name="line.168"></a>
<span class="sourceLineNo">169</span> regionMetricsLossyCounting.add(regionRequestMeter);<a name="line.169"></a>
<span class="sourceLineNo">170</span> registerAndMarkMeter(regionRequestMeter);<a name="line.170"></a>
<span class="sourceLineNo">171</span> }<a name="line.171"></a>
<span class="sourceLineNo">172</span><a name="line.172"></a>
<span class="sourceLineNo">173</span> private void opMetricRegisterAndMark(Row op) {<a name="line.173"></a>
<span class="sourceLineNo">174</span> // Mark access type ["get", "put", "delete"] metric<a name="line.174"></a>
<span class="sourceLineNo">175</span> String opMeterName = opMeterName(op);<a name="line.175"></a>
<span class="sourceLineNo">176</span> if (opMeterName == null || opMeterName.isEmpty()) {<a name="line.176"></a>
<span class="sourceLineNo">177</span> return;<a name="line.177"></a>
<span class="sourceLineNo">178</span> }<a name="line.178"></a>
<span class="sourceLineNo">179</span> registerAndMarkMeter(opMeterName);<a name="line.179"></a>
<span class="sourceLineNo">180</span> }<a name="line.180"></a>
<span class="sourceLineNo">181</span><a name="line.181"></a>
<span class="sourceLineNo">182</span> private void opWithClientMetricRegisterAndMark(Object op) {<a name="line.182"></a>
<span class="sourceLineNo">183</span> // // Mark client + access type metric<a name="line.183"></a>
<span class="sourceLineNo">184</span> String opWithClientMeterName = opWithClientMeterName(op);<a name="line.184"></a>
<span class="sourceLineNo">185</span> if (opWithClientMeterName == null || opWithClientMeterName.isEmpty()) {<a name="line.185"></a>
<span class="sourceLineNo">186</span> return;<a name="line.186"></a>
<span class="sourceLineNo">187</span> }<a name="line.187"></a>
<span class="sourceLineNo">188</span> registerAndMarkMeter(opWithClientMeterName);<a name="line.188"></a>
<span class="sourceLineNo">189</span> }<a name="line.189"></a>
<span class="sourceLineNo">190</span><a name="line.190"></a>
<span class="sourceLineNo">191</span> // Helper function to register and mark meter if not present<a name="line.191"></a>
<span class="sourceLineNo">192</span> private void registerAndMarkMeter(String requestMeter) {<a name="line.192"></a>
<span class="sourceLineNo">193</span> if (requestMeter.isEmpty()) {<a name="line.193"></a>
<span class="sourceLineNo">194</span> return;<a name="line.194"></a>
<span class="sourceLineNo">195</span> }<a name="line.195"></a>
<span class="sourceLineNo">196</span> if(!registry.get(requestMeter).isPresent()){<a name="line.196"></a>
<span class="sourceLineNo">197</span> metrics.add(requestMeter);<a name="line.197"></a>
<span class="sourceLineNo">198</span> }<a name="line.198"></a>
<span class="sourceLineNo">199</span> registry.meter(requestMeter).mark();<a name="line.199"></a>
<span class="sourceLineNo">200</span> }<a name="line.200"></a>
<span class="sourceLineNo">201</span><a name="line.201"></a>
<span class="sourceLineNo">202</span> private String opWithClientMeterName(Object op) {<a name="line.202"></a>
<span class="sourceLineNo">203</span> // Extract meter name containing the client IP<a name="line.203"></a>
<span class="sourceLineNo">204</span> String clientIP = RpcServer.getRemoteIp() != null ? RpcServer.getRemoteIp().toString() : "";<a name="line.204"></a>
<span class="sourceLineNo">205</span> if (clientIP.isEmpty()) {<a name="line.205"></a>
<span class="sourceLineNo">206</span> return "";<a name="line.206"></a>
<span class="sourceLineNo">207</span> }<a name="line.207"></a>
<span class="sourceLineNo">208</span> MetaTableOps ops = opsNameMap.get(op.getClass());<a name="line.208"></a>
<span class="sourceLineNo">209</span> String opWithClientMeterName = "";<a name="line.209"></a>
<span class="sourceLineNo">210</span> switch (ops) {<a name="line.210"></a>
<span class="sourceLineNo">211</span> case GET:<a name="line.211"></a>
<span class="sourceLineNo">212</span> opWithClientMeterName = String.format("MetaTable_client_%s_get_request", clientIP);<a name="line.212"></a>
<span class="sourceLineNo">213</span> break;<a name="line.213"></a>
<span class="sourceLineNo">214</span> case PUT:<a name="line.214"></a>
<span class="sourceLineNo">215</span> opWithClientMeterName = String.format("MetaTable_client_%s_put_request", clientIP);<a name="line.215"></a>
<span class="sourceLineNo">216</span> break;<a name="line.216"></a>
<span class="sourceLineNo">217</span> case DELETE:<a name="line.217"></a>
<span class="sourceLineNo">218</span> opWithClientMeterName = String.format("MetaTable_client_%s_delete_request", clientIP);<a name="line.218"></a>
<span class="sourceLineNo">219</span> break;<a name="line.219"></a>
<span class="sourceLineNo">220</span> default:<a name="line.220"></a>
<span class="sourceLineNo">221</span> break;<a name="line.221"></a>
<span class="sourceLineNo">222</span> }<a name="line.222"></a>
<span class="sourceLineNo">223</span> return opWithClientMeterName;<a name="line.223"></a>
<span class="sourceLineNo">224</span> }<a name="line.224"></a>
<span class="sourceLineNo">225</span><a name="line.225"></a>
<span class="sourceLineNo">226</span> private String opMeterName(Object op) {<a name="line.226"></a>
<span class="sourceLineNo">227</span> // Extract meter name containing the access type<a name="line.227"></a>
<span class="sourceLineNo">228</span> MetaTableOps ops = opsNameMap.get(op.getClass());<a name="line.228"></a>
<span class="sourceLineNo">229</span> String opMeterName = "";<a name="line.229"></a>
<span class="sourceLineNo">230</span> switch (ops) {<a name="line.230"></a>
<span class="sourceLineNo">231</span> case GET:<a name="line.231"></a>
<span class="sourceLineNo">232</span> opMeterName = "MetaTable_get_request";<a name="line.232"></a>
<span class="sourceLineNo">233</span> break;<a name="line.233"></a>
<span class="sourceLineNo">234</span> case PUT:<a name="line.234"></a>
<span class="sourceLineNo">235</span> opMeterName = "MetaTable_put_request";<a name="line.235"></a>
<span class="sourceLineNo">236</span> break;<a name="line.236"></a>
<span class="sourceLineNo">237</span> case DELETE:<a name="line.237"></a>
<span class="sourceLineNo">238</span> opMeterName = "MetaTable_delete_request";<a name="line.238"></a>
<span class="sourceLineNo">239</span> break;<a name="line.239"></a>
<span class="sourceLineNo">240</span> default:<a name="line.240"></a>
<span class="sourceLineNo">241</span> break;<a name="line.241"></a>
<span class="sourceLineNo">242</span> }<a name="line.242"></a>
<span class="sourceLineNo">243</span> return opMeterName;<a name="line.243"></a>
<span class="sourceLineNo">244</span> }<a name="line.244"></a>
<span class="sourceLineNo">245</span><a name="line.245"></a>
<span class="sourceLineNo">246</span> private String tableMeterName(String tableName) {<a name="line.246"></a>
<span class="sourceLineNo">247</span> // Extract meter name containing the table name<a name="line.247"></a>
<span class="sourceLineNo">248</span> return String.format("MetaTable_table_%s_request", tableName);<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>
<span class="sourceLineNo">251</span> private String clientRequestMeterName(String clientIP) {<a name="line.251"></a>
<span class="sourceLineNo">252</span> // Extract meter name containing the client IP<a name="line.252"></a>
<span class="sourceLineNo">253</span> if (clientIP.isEmpty()) {<a name="line.253"></a>
<span class="sourceLineNo">254</span> return "";<a name="line.254"></a>
<span class="sourceLineNo">255</span> }<a name="line.255"></a>
<span class="sourceLineNo">256</span> return String.format("MetaTable_client_%s_lossy_request", clientIP);<a name="line.256"></a>
<span class="sourceLineNo">257</span> }<a name="line.257"></a>
<span class="sourceLineNo">258</span><a name="line.258"></a>
<span class="sourceLineNo">259</span> private String regionMeterName(String regionId) {<a name="line.259"></a>
<span class="sourceLineNo">260</span> // Extract meter name containing the region ID<a name="line.260"></a>
<span class="sourceLineNo">261</span> return String.format("MetaTable_region_%s_lossy_request", regionId);<a name="line.261"></a>
<span class="sourceLineNo">262</span> }<a name="line.262"></a>
<span class="sourceLineNo">263</span> }<a name="line.263"></a>
<span class="sourceLineNo">264</span><a name="line.264"></a>
<span class="sourceLineNo">265</span> @Override<a name="line.265"></a>
<span class="sourceLineNo">266</span> public Optional&lt;RegionObserver&gt; getRegionObserver() {<a name="line.266"></a>
<span class="sourceLineNo">267</span> return Optional.of(observer);<a name="line.267"></a>
<span class="sourceLineNo">268</span> }<a name="line.268"></a>
<span class="sourceLineNo">269</span><a name="line.269"></a>
<span class="sourceLineNo">270</span> @Override<a name="line.270"></a>
<span class="sourceLineNo">271</span> public void start(CoprocessorEnvironment env) throws IOException {<a name="line.271"></a>
<span class="sourceLineNo">272</span> observer = new ExampleRegionObserverMeta();<a name="line.272"></a>
<span class="sourceLineNo">273</span> if (env instanceof RegionCoprocessorEnvironment<a name="line.273"></a>
<span class="sourceLineNo">274</span> &amp;&amp; ((RegionCoprocessorEnvironment) env).getRegionInfo().getTable() != null<a name="line.274"></a>
<span class="sourceLineNo">275</span> &amp;&amp; ((RegionCoprocessorEnvironment) env).getRegionInfo().getTable()<a name="line.275"></a>
<span class="sourceLineNo">276</span> .equals(TableName.META_TABLE_NAME)) {<a name="line.276"></a>
<span class="sourceLineNo">277</span> RegionCoprocessorEnvironment regionCoprocessorEnv = (RegionCoprocessorEnvironment) env;<a name="line.277"></a>
<span class="sourceLineNo">278</span> registry = regionCoprocessorEnv.getMetricRegistryForRegionServer();<a name="line.278"></a>
<span class="sourceLineNo">279</span> LossyCounting.LossyCountingListener&lt;String&gt; listener = key -&gt; {<a name="line.279"></a>
<span class="sourceLineNo">280</span> registry.remove(key);<a name="line.280"></a>
<span class="sourceLineNo">281</span> metrics.remove(key);<a name="line.281"></a>
<span class="sourceLineNo">282</span> };<a name="line.282"></a>
<span class="sourceLineNo">283</span> final Configuration conf = regionCoprocessorEnv.getConfiguration();<a name="line.283"></a>
<span class="sourceLineNo">284</span> clientMetricsLossyCounting = new LossyCounting&lt;&gt;("clientMetaMetrics", conf, listener);<a name="line.284"></a>
<span class="sourceLineNo">285</span> regionMetricsLossyCounting = new LossyCounting&lt;&gt;("regionMetaMetrics", conf, listener);<a name="line.285"></a>
<span class="sourceLineNo">286</span> // only be active mode when this region holds meta table.<a name="line.286"></a>
<span class="sourceLineNo">287</span> active = true;<a name="line.287"></a>
<span class="sourceLineNo">288</span> }<a name="line.288"></a>
<span class="sourceLineNo">289</span> }<a name="line.289"></a>
<span class="sourceLineNo">290</span><a name="line.290"></a>
<span class="sourceLineNo">291</span> @Override<a name="line.291"></a>
<span class="sourceLineNo">292</span> public void stop(CoprocessorEnvironment env) throws IOException {<a name="line.292"></a>
<span class="sourceLineNo">293</span> // since meta region can move around, clear stale metrics when stop.<a name="line.293"></a>
<span class="sourceLineNo">294</span> for(String metric:metrics){<a name="line.294"></a>
<span class="sourceLineNo">295</span> registry.remove(metric);<a name="line.295"></a>
<span class="sourceLineNo">296</span> }<a name="line.296"></a>
<span class="sourceLineNo">297</span> }<a name="line.297"></a>
<span class="sourceLineNo">298</span>}<a name="line.298"></a>
</pre>
</div>
</body>
</html>