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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.util;<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>import java.io.IOException;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.util.List;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.util.concurrent.Callable;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import org.apache.hadoop.hbase.HRegionLocation;<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.client.Admin;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import org.apache.hadoop.hbase.client.Connection;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import org.apache.hadoop.hbase.client.RegionInfo;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import org.apache.hadoop.hbase.client.ResultScanner;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import org.apache.hadoop.hbase.client.Scan;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.client.Table;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.filter.FirstKeyOnlyFilter;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import org.slf4j.Logger;<a name="line.33"></a>
<span class="sourceLineNo">034</span>import org.slf4j.LoggerFactory;<a name="line.34"></a>
<span class="sourceLineNo">035</span><a name="line.35"></a>
<span class="sourceLineNo">036</span>/**<a name="line.36"></a>
<span class="sourceLineNo">037</span> * Move Regions and make sure that they are up on the target server.If a region movement fails we<a name="line.37"></a>
<span class="sourceLineNo">038</span> * exit as failure<a name="line.38"></a>
<span class="sourceLineNo">039</span> */<a name="line.39"></a>
<span class="sourceLineNo">040</span>@InterfaceAudience.Private<a name="line.40"></a>
<span class="sourceLineNo">041</span>class MoveWithAck implements Callable&lt;Boolean&gt; {<a name="line.41"></a>
<span class="sourceLineNo">042</span><a name="line.42"></a>
<span class="sourceLineNo">043</span> private static final Logger LOG = LoggerFactory.getLogger(MoveWithAck.class);<a name="line.43"></a>
<span class="sourceLineNo">044</span><a name="line.44"></a>
<span class="sourceLineNo">045</span> private final RegionInfo region;<a name="line.45"></a>
<span class="sourceLineNo">046</span> private final ServerName targetServer;<a name="line.46"></a>
<span class="sourceLineNo">047</span> private final List&lt;RegionInfo&gt; movedRegions;<a name="line.47"></a>
<span class="sourceLineNo">048</span> private final ServerName sourceServer;<a name="line.48"></a>
<span class="sourceLineNo">049</span> private final Connection conn;<a name="line.49"></a>
<span class="sourceLineNo">050</span> private final Admin admin;<a name="line.50"></a>
<span class="sourceLineNo">051</span><a name="line.51"></a>
<span class="sourceLineNo">052</span> MoveWithAck(Connection conn, RegionInfo regionInfo, ServerName sourceServer,<a name="line.52"></a>
<span class="sourceLineNo">053</span> ServerName targetServer, List&lt;RegionInfo&gt; movedRegions) throws IOException {<a name="line.53"></a>
<span class="sourceLineNo">054</span> this.conn = conn;<a name="line.54"></a>
<span class="sourceLineNo">055</span> this.region = regionInfo;<a name="line.55"></a>
<span class="sourceLineNo">056</span> this.targetServer = targetServer;<a name="line.56"></a>
<span class="sourceLineNo">057</span> this.movedRegions = movedRegions;<a name="line.57"></a>
<span class="sourceLineNo">058</span> this.sourceServer = sourceServer;<a name="line.58"></a>
<span class="sourceLineNo">059</span> this.admin = conn.getAdmin();<a name="line.59"></a>
<span class="sourceLineNo">060</span> }<a name="line.60"></a>
<span class="sourceLineNo">061</span><a name="line.61"></a>
<span class="sourceLineNo">062</span> @Override<a name="line.62"></a>
<span class="sourceLineNo">063</span> public Boolean call() throws IOException, InterruptedException {<a name="line.63"></a>
<span class="sourceLineNo">064</span> boolean moved = false;<a name="line.64"></a>
<span class="sourceLineNo">065</span> int count = 0;<a name="line.65"></a>
<span class="sourceLineNo">066</span> int retries = admin.getConfiguration().getInt(RegionMover.MOVE_RETRIES_MAX_KEY,<a name="line.66"></a>
<span class="sourceLineNo">067</span> RegionMover.DEFAULT_MOVE_RETRIES_MAX);<a name="line.67"></a>
<span class="sourceLineNo">068</span> int maxWaitInSeconds = admin.getConfiguration().getInt(RegionMover.MOVE_WAIT_MAX_KEY,<a name="line.68"></a>
<span class="sourceLineNo">069</span> RegionMover.DEFAULT_MOVE_WAIT_MAX);<a name="line.69"></a>
<span class="sourceLineNo">070</span> long startTime = EnvironmentEdgeManager.currentTime();<a name="line.70"></a>
<span class="sourceLineNo">071</span> boolean sameServer = true;<a name="line.71"></a>
<span class="sourceLineNo">072</span> // Assert we can scan the region in its current location<a name="line.72"></a>
<span class="sourceLineNo">073</span> isSuccessfulScan(region);<a name="line.73"></a>
<span class="sourceLineNo">074</span> LOG.info("Moving region: {} from {} to {}", region.getRegionNameAsString(), sourceServer,<a name="line.74"></a>
<span class="sourceLineNo">075</span> targetServer);<a name="line.75"></a>
<span class="sourceLineNo">076</span> while (count &lt; retries &amp;&amp; sameServer) {<a name="line.76"></a>
<span class="sourceLineNo">077</span> if (count &gt; 0) {<a name="line.77"></a>
<span class="sourceLineNo">078</span> LOG.debug("Retry {} of maximum {} for region: {}", count, retries,<a name="line.78"></a>
<span class="sourceLineNo">079</span> region.getRegionNameAsString());<a name="line.79"></a>
<span class="sourceLineNo">080</span> }<a name="line.80"></a>
<span class="sourceLineNo">081</span> count = count + 1;<a name="line.81"></a>
<span class="sourceLineNo">082</span> admin.move(region.getEncodedNameAsBytes(), targetServer);<a name="line.82"></a>
<span class="sourceLineNo">083</span> long maxWait = startTime + (maxWaitInSeconds * 1000);<a name="line.83"></a>
<span class="sourceLineNo">084</span> while (EnvironmentEdgeManager.currentTime() &lt; maxWait) {<a name="line.84"></a>
<span class="sourceLineNo">085</span> sameServer = isSameServer(region, sourceServer);<a name="line.85"></a>
<span class="sourceLineNo">086</span> if (!sameServer) {<a name="line.86"></a>
<span class="sourceLineNo">087</span> break;<a name="line.87"></a>
<span class="sourceLineNo">088</span> }<a name="line.88"></a>
<span class="sourceLineNo">089</span> Thread.sleep(1000);<a name="line.89"></a>
<span class="sourceLineNo">090</span> }<a name="line.90"></a>
<span class="sourceLineNo">091</span> }<a name="line.91"></a>
<span class="sourceLineNo">092</span> if (sameServer) {<a name="line.92"></a>
<span class="sourceLineNo">093</span> LOG.error("Region: {} stuck on {} for {} sec , newServer={}", region.getRegionNameAsString(),<a name="line.93"></a>
<span class="sourceLineNo">094</span> this.sourceServer, getTimeDiffInSec(startTime), this.targetServer);<a name="line.94"></a>
<span class="sourceLineNo">095</span> } else {<a name="line.95"></a>
<span class="sourceLineNo">096</span> isSuccessfulScan(region);<a name="line.96"></a>
<span class="sourceLineNo">097</span> LOG.info("Moved Region {} , cost (sec): {}", region.getRegionNameAsString(),<a name="line.97"></a>
<span class="sourceLineNo">098</span> getTimeDiffInSec(startTime));<a name="line.98"></a>
<span class="sourceLineNo">099</span> moved = true;<a name="line.99"></a>
<span class="sourceLineNo">100</span> movedRegions.add(region);<a name="line.100"></a>
<span class="sourceLineNo">101</span> }<a name="line.101"></a>
<span class="sourceLineNo">102</span> return moved;<a name="line.102"></a>
<span class="sourceLineNo">103</span> }<a name="line.103"></a>
<span class="sourceLineNo">104</span><a name="line.104"></a>
<span class="sourceLineNo">105</span> private static String getTimeDiffInSec(long startTime) {<a name="line.105"></a>
<span class="sourceLineNo">106</span> return String.format("%.3f", (float) (EnvironmentEdgeManager.currentTime() - startTime) / 1000);<a name="line.106"></a>
<span class="sourceLineNo">107</span> }<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> * Tries to scan a row from passed region<a name="line.110"></a>
<span class="sourceLineNo">111</span> */<a name="line.111"></a>
<span class="sourceLineNo">112</span> private void isSuccessfulScan(RegionInfo region) throws IOException {<a name="line.112"></a>
<span class="sourceLineNo">113</span> Scan scan = new Scan().withStartRow(region.getStartKey()).setRaw(true).setOneRowLimit()<a name="line.113"></a>
<span class="sourceLineNo">114</span> .setMaxResultSize(1L).setCaching(1).setFilter(new FirstKeyOnlyFilter()).setCacheBlocks(false);<a name="line.114"></a>
<span class="sourceLineNo">115</span> try (Table table = conn.getTable(region.getTable());<a name="line.115"></a>
<span class="sourceLineNo">116</span> ResultScanner scanner = table.getScanner(scan)) {<a name="line.116"></a>
<span class="sourceLineNo">117</span> scanner.next();<a name="line.117"></a>
<span class="sourceLineNo">118</span> } catch (IOException e) {<a name="line.118"></a>
<span class="sourceLineNo">119</span> LOG.error("Could not scan region: {}", region.getEncodedName(), e);<a name="line.119"></a>
<span class="sourceLineNo">120</span> throw e;<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> /**<a name="line.124"></a>
<span class="sourceLineNo">125</span> * Returns true if passed region is still on serverName when we look at hbase:meta.<a name="line.125"></a>
<span class="sourceLineNo">126</span> * @return true if region is hosted on serverName otherwise false<a name="line.126"></a>
<span class="sourceLineNo">127</span> */<a name="line.127"></a>
<span class="sourceLineNo">128</span> private boolean isSameServer(RegionInfo region, ServerName serverName) throws IOException {<a name="line.128"></a>
<span class="sourceLineNo">129</span> ServerName serverForRegion = getServerNameForRegion(region, admin, conn);<a name="line.129"></a>
<span class="sourceLineNo">130</span> return serverForRegion != null &amp;&amp; serverForRegion.equals(serverName);<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> /**<a name="line.133"></a>
<span class="sourceLineNo">134</span> * Get servername that is up in hbase:meta hosting the given region. this is hostname + port +<a name="line.134"></a>
<span class="sourceLineNo">135</span> * startcode comma-delimited. Can return null<a name="line.135"></a>
<span class="sourceLineNo">136</span> * @return regionServer hosting the given region<a name="line.136"></a>
<span class="sourceLineNo">137</span> */<a name="line.137"></a>
<span class="sourceLineNo">138</span> static ServerName getServerNameForRegion(RegionInfo region, Admin admin, Connection conn)<a name="line.138"></a>
<span class="sourceLineNo">139</span> throws IOException {<a name="line.139"></a>
<span class="sourceLineNo">140</span> if (!admin.isTableEnabled(region.getTable())) {<a name="line.140"></a>
<span class="sourceLineNo">141</span> return null;<a name="line.141"></a>
<span class="sourceLineNo">142</span> }<a name="line.142"></a>
<span class="sourceLineNo">143</span> HRegionLocation loc = conn.getRegionLocator(region.getTable())<a name="line.143"></a>
<span class="sourceLineNo">144</span> .getRegionLocation(region.getStartKey(), region.getReplicaId(), true);<a name="line.144"></a>
<span class="sourceLineNo">145</span> if (loc != null) {<a name="line.145"></a>
<span class="sourceLineNo">146</span> return loc.getServerName();<a name="line.146"></a>
<span class="sourceLineNo">147</span> } else {<a name="line.147"></a>
<span class="sourceLineNo">148</span> return null;<a name="line.148"></a>
<span class="sourceLineNo">149</span> }<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>}<a name="line.152"></a>
</pre>
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