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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.regionserver.handler;<a name="line.18"></a> |
| <span class="sourceLineNo">019</span><a name="line.19"></a> |
| <span class="sourceLineNo">020</span>import edu.umd.cs.findbugs.annotations.Nullable;<a name="line.20"></a> |
| <span class="sourceLineNo">021</span>import java.io.IOException;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import java.util.concurrent.TimeUnit;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import org.apache.hadoop.hbase.HConstants;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import org.apache.hadoop.hbase.ServerName;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import org.apache.hadoop.hbase.executor.EventHandler;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import org.apache.hadoop.hbase.executor.EventType;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span>import org.apache.hadoop.hbase.regionserver.HRegion;<a name="line.27"></a> |
| <span class="sourceLineNo">028</span>import org.apache.hadoop.hbase.regionserver.HRegionServer;<a name="line.28"></a> |
| <span class="sourceLineNo">029</span>import org.apache.hadoop.hbase.regionserver.Region;<a name="line.29"></a> |
| <span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.regionserver.RegionServerServices.RegionStateTransitionContext;<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.31"></a> |
| <span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.util.RetryCounter;<a name="line.32"></a> |
| <span class="sourceLineNo">033</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.33"></a> |
| <span class="sourceLineNo">034</span>import org.slf4j.Logger;<a name="line.34"></a> |
| <span class="sourceLineNo">035</span>import org.slf4j.LoggerFactory;<a name="line.35"></a> |
| <span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.shaded.protobuf.generated.RegionServerStatusProtos.RegionStateTransition.TransitionCode;<a name="line.36"></a> |
| <span class="sourceLineNo">037</span><a name="line.37"></a> |
| <span class="sourceLineNo">038</span>/**<a name="line.38"></a> |
| <span class="sourceLineNo">039</span> * Handles closing of a region on a region server.<a name="line.39"></a> |
| <span class="sourceLineNo">040</span> * <p/><a name="line.40"></a> |
| <span class="sourceLineNo">041</span> * Just done the same thing with the old {@link CloseRegionHandler}, with some modifications on<a name="line.41"></a> |
| <span class="sourceLineNo">042</span> * fencing and retrying. But we need to keep the {@link CloseRegionHandler} as is to keep compatible<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> * with the zk less assignment for 1.x, otherwise it is not possible to do rolling upgrade.<a name="line.43"></a> |
| <span class="sourceLineNo">044</span> */<a name="line.44"></a> |
| <span class="sourceLineNo">045</span>@InterfaceAudience.Private<a name="line.45"></a> |
| <span class="sourceLineNo">046</span>public class UnassignRegionHandler extends EventHandler {<a name="line.46"></a> |
| <span class="sourceLineNo">047</span><a name="line.47"></a> |
| <span class="sourceLineNo">048</span> private static final Logger LOG = LoggerFactory.getLogger(UnassignRegionHandler.class);<a name="line.48"></a> |
| <span class="sourceLineNo">049</span><a name="line.49"></a> |
| <span class="sourceLineNo">050</span> private final String encodedName;<a name="line.50"></a> |
| <span class="sourceLineNo">051</span><a name="line.51"></a> |
| <span class="sourceLineNo">052</span> private final long closeProcId;<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> // If true, the hosting server is aborting. Region close process is different<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> // when we are aborting.<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> // TODO: not used yet, we still use the old CloseRegionHandler when aborting<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> private final boolean abort;<a name="line.56"></a> |
| <span class="sourceLineNo">057</span><a name="line.57"></a> |
| <span class="sourceLineNo">058</span> private final ServerName destination;<a name="line.58"></a> |
| <span class="sourceLineNo">059</span><a name="line.59"></a> |
| <span class="sourceLineNo">060</span> private final RetryCounter retryCounter;<a name="line.60"></a> |
| <span class="sourceLineNo">061</span><a name="line.61"></a> |
| <span class="sourceLineNo">062</span> public UnassignRegionHandler(HRegionServer server, String encodedName, long closeProcId,<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> boolean abort, @Nullable ServerName destination, EventType eventType) {<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> super(server, eventType);<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> this.encodedName = encodedName;<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> this.closeProcId = closeProcId;<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> this.abort = abort;<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> this.destination = destination;<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> this.retryCounter = HandlerUtil.getRetryCounter();<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> }<a name="line.70"></a> |
| <span class="sourceLineNo">071</span><a name="line.71"></a> |
| <span class="sourceLineNo">072</span> private HRegionServer getServer() {<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> return (HRegionServer) server;<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> }<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 void process() throws IOException {<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> HRegionServer rs = getServer();<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> byte[] encodedNameBytes = Bytes.toBytes(encodedName);<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> Boolean previous = rs.getRegionsInTransitionInRS().putIfAbsent(encodedNameBytes, Boolean.FALSE);<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> if (previous != null) {<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> if (previous) {<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> // This could happen as we will update the region state to OPEN when calling<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> // reportRegionStateTransition, so the HMaster will think the region is online, before we<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> // actually open the region, as reportRegionStateTransition is part of the opening process.<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> long backoff = retryCounter.getBackoffTimeAndIncrementAttempts();<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> LOG.warn("Received CLOSE for {} which we are already " +<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> "trying to OPEN; try again after {}ms", encodedName, backoff);<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> rs.getExecutorService().delayedSubmit(this, backoff, TimeUnit.MILLISECONDS);<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> } else {<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> LOG.info("Received CLOSE for {} which we are already trying to CLOSE," +<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> " but not completed yet", encodedName);<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> }<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> HRegion region = rs.getRegion(encodedName);<a name="line.96"></a> |
| <span class="sourceLineNo">097</span> if (region == null) {<a name="line.97"></a> |
| <span class="sourceLineNo">098</span> LOG.debug("Received CLOSE for {} which is not ONLINE and we're not opening/closing.",<a name="line.98"></a> |
| <span class="sourceLineNo">099</span> encodedName);<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> rs.getRegionsInTransitionInRS().remove(encodedNameBytes, Boolean.FALSE);<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> String regionName = region.getRegionInfo().getEncodedName();<a name="line.103"></a> |
| <span class="sourceLineNo">104</span> LOG.info("Close {}", regionName);<a name="line.104"></a> |
| <span class="sourceLineNo">105</span> if (region.getCoprocessorHost() != null) {<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> // XXX: The behavior is a bit broken. At master side there is no FAILED_CLOSE state, so if<a name="line.106"></a> |
| <span class="sourceLineNo">107</span> // there are exception thrown from the CP, we can not report the error to master, and if<a name="line.107"></a> |
| <span class="sourceLineNo">108</span> // here we just return without calling reportRegionStateTransition, the TRSP at master side<a name="line.108"></a> |
| <span class="sourceLineNo">109</span> // will hang there for ever. So here if the CP throws an exception out, the only way is to<a name="line.109"></a> |
| <span class="sourceLineNo">110</span> // abort the RS...<a name="line.110"></a> |
| <span class="sourceLineNo">111</span> region.getCoprocessorHost().preClose(abort);<a name="line.111"></a> |
| <span class="sourceLineNo">112</span> }<a name="line.112"></a> |
| <span class="sourceLineNo">113</span> if (region.close(abort) == null) {<a name="line.113"></a> |
| <span class="sourceLineNo">114</span> // XXX: Is this still possible? The old comment says about split, but now split is done at<a name="line.114"></a> |
| <span class="sourceLineNo">115</span> // master side, so...<a name="line.115"></a> |
| <span class="sourceLineNo">116</span> LOG.warn("Can't close {} already closed during close()", regionName);<a name="line.116"></a> |
| <span class="sourceLineNo">117</span> rs.getRegionsInTransitionInRS().remove(encodedNameBytes, Boolean.FALSE);<a name="line.117"></a> |
| <span class="sourceLineNo">118</span> return;<a name="line.118"></a> |
| <span class="sourceLineNo">119</span> }<a name="line.119"></a> |
| <span class="sourceLineNo">120</span><a name="line.120"></a> |
| <span class="sourceLineNo">121</span> rs.removeRegion(region, destination);<a name="line.121"></a> |
| <span class="sourceLineNo">122</span> if (!rs.reportRegionStateTransition(<a name="line.122"></a> |
| <span class="sourceLineNo">123</span> new RegionStateTransitionContext(TransitionCode.CLOSED, HConstants.NO_SEQNUM, closeProcId,<a name="line.123"></a> |
| <span class="sourceLineNo">124</span> -1, region.getRegionInfo()))) {<a name="line.124"></a> |
| <span class="sourceLineNo">125</span> throw new IOException("Failed to report close to master: " + regionName);<a name="line.125"></a> |
| <span class="sourceLineNo">126</span> }<a name="line.126"></a> |
| <span class="sourceLineNo">127</span> // Cache the close region procedure id after report region transition succeed.<a name="line.127"></a> |
| <span class="sourceLineNo">128</span> rs.finishRegionProcedure(closeProcId);<a name="line.128"></a> |
| <span class="sourceLineNo">129</span> rs.getRegionsInTransitionInRS().remove(encodedNameBytes, Boolean.FALSE);<a name="line.129"></a> |
| <span class="sourceLineNo">130</span> LOG.info("Closed {}", regionName);<a name="line.130"></a> |
| <span class="sourceLineNo">131</span> }<a name="line.131"></a> |
| <span class="sourceLineNo">132</span><a name="line.132"></a> |
| <span class="sourceLineNo">133</span> @Override<a name="line.133"></a> |
| <span class="sourceLineNo">134</span> protected void handleException(Throwable t) {<a name="line.134"></a> |
| <span class="sourceLineNo">135</span> LOG.warn("Fatal error occurred while closing region {}, aborting...", encodedName, t);<a name="line.135"></a> |
| <span class="sourceLineNo">136</span> // Clear any reference in getServer().getRegionsInTransitionInRS() otherwise can hold up<a name="line.136"></a> |
| <span class="sourceLineNo">137</span> // regionserver abort on cluster shutdown. HBASE-23984.<a name="line.137"></a> |
| <span class="sourceLineNo">138</span> getServer().getRegionsInTransitionInRS().remove(Bytes.toBytes(this.encodedName));<a name="line.138"></a> |
| <span class="sourceLineNo">139</span> getServer().abort("Failed to close region " + encodedName + " and can not recover", t);<a name="line.139"></a> |
| <span class="sourceLineNo">140</span> }<a name="line.140"></a> |
| <span class="sourceLineNo">141</span><a name="line.141"></a> |
| <span class="sourceLineNo">142</span> public static UnassignRegionHandler create(HRegionServer server, String encodedName,<a name="line.142"></a> |
| <span class="sourceLineNo">143</span> long closeProcId, boolean abort, @Nullable ServerName destination) {<a name="line.143"></a> |
| <span class="sourceLineNo">144</span> // Just try our best to determine whether it is for closing meta. It is not the end of the world<a name="line.144"></a> |
| <span class="sourceLineNo">145</span> // if we put the handler into a wrong executor.<a name="line.145"></a> |
| <span class="sourceLineNo">146</span> Region region = server.getRegion(encodedName);<a name="line.146"></a> |
| <span class="sourceLineNo">147</span> EventType eventType =<a name="line.147"></a> |
| <span class="sourceLineNo">148</span> region != null && region.getRegionInfo().isMetaRegion() ? EventType.M_RS_CLOSE_META<a name="line.148"></a> |
| <span class="sourceLineNo">149</span> : EventType.M_RS_CLOSE_REGION;<a name="line.149"></a> |
| <span class="sourceLineNo">150</span> return new UnassignRegionHandler(server, encodedName, closeProcId, abort, destination,<a name="line.150"></a> |
| <span class="sourceLineNo">151</span> eventType);<a name="line.151"></a> |
| <span class="sourceLineNo">152</span> }<a name="line.152"></a> |
| <span class="sourceLineNo">153</span>}<a name="line.153"></a> |
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