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<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>package org.apache.hadoop.hbase.util;<a name="line.19"></a>
<span class="sourceLineNo">020</span><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.HashMap;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.util.Map;<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.util.concurrent.atomic.AtomicInteger;<a name="line.25"></a>
<span class="sourceLineNo">026</span><a name="line.26"></a>
<span class="sourceLineNo">027</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import org.slf4j.Logger;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import org.slf4j.LoggerFactory;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import org.apache.hadoop.fs.BlockLocation;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import org.apache.hadoop.fs.FileStatus;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import org.apache.hadoop.fs.FileSystem;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import org.apache.hadoop.fs.Path;<a name="line.33"></a>
<span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.util.FSUtils;<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> * Thread that walks over the filesystem, and computes the mappings<a name="line.37"></a>
<span class="sourceLineNo">038</span> * Region -&gt; BestHost and Region -&gt; {@code Map&lt;HostName, fractional-locality-of-region&gt;}<a name="line.38"></a>
<span class="sourceLineNo">039</span> *<a name="line.39"></a>
<span class="sourceLineNo">040</span> */<a name="line.40"></a>
<span class="sourceLineNo">041</span>@InterfaceAudience.Private<a name="line.41"></a>
<span class="sourceLineNo">042</span>class FSRegionScanner implements Runnable {<a name="line.42"></a>
<span class="sourceLineNo">043</span> static private final Logger LOG = LoggerFactory.getLogger(FSRegionScanner.class);<a name="line.43"></a>
<span class="sourceLineNo">044</span><a name="line.44"></a>
<span class="sourceLineNo">045</span> private Path regionPath;<a name="line.45"></a>
<span class="sourceLineNo">046</span><a name="line.46"></a>
<span class="sourceLineNo">047</span> /**<a name="line.47"></a>
<span class="sourceLineNo">048</span> * The file system used<a name="line.48"></a>
<span class="sourceLineNo">049</span> */<a name="line.49"></a>
<span class="sourceLineNo">050</span> private FileSystem fs;<a name="line.50"></a>
<span class="sourceLineNo">051</span><a name="line.51"></a>
<span class="sourceLineNo">052</span> /**<a name="line.52"></a>
<span class="sourceLineNo">053</span> * Maps each region to the RS with highest locality for that region.<a name="line.53"></a>
<span class="sourceLineNo">054</span> */<a name="line.54"></a>
<span class="sourceLineNo">055</span> private final Map&lt;String,String&gt; regionToBestLocalityRSMapping;<a name="line.55"></a>
<span class="sourceLineNo">056</span><a name="line.56"></a>
<span class="sourceLineNo">057</span> /**<a name="line.57"></a>
<span class="sourceLineNo">058</span> * Maps region encoded names to maps of hostnames to fractional locality of<a name="line.58"></a>
<span class="sourceLineNo">059</span> * that region on that host.<a name="line.59"></a>
<span class="sourceLineNo">060</span> */<a name="line.60"></a>
<span class="sourceLineNo">061</span> private Map&lt;String, Map&lt;String, Float&gt;&gt; regionDegreeLocalityMapping;<a name="line.61"></a>
<span class="sourceLineNo">062</span><a name="line.62"></a>
<span class="sourceLineNo">063</span> FSRegionScanner(FileSystem fs, Path regionPath,<a name="line.63"></a>
<span class="sourceLineNo">064</span> Map&lt;String, String&gt; regionToBestLocalityRSMapping,<a name="line.64"></a>
<span class="sourceLineNo">065</span> Map&lt;String, Map&lt;String, Float&gt;&gt; regionDegreeLocalityMapping) {<a name="line.65"></a>
<span class="sourceLineNo">066</span> this.fs = fs;<a name="line.66"></a>
<span class="sourceLineNo">067</span> this.regionPath = regionPath;<a name="line.67"></a>
<span class="sourceLineNo">068</span> this.regionToBestLocalityRSMapping = regionToBestLocalityRSMapping;<a name="line.68"></a>
<span class="sourceLineNo">069</span> this.regionDegreeLocalityMapping = regionDegreeLocalityMapping;<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> @Override<a name="line.72"></a>
<span class="sourceLineNo">073</span> public void run() {<a name="line.73"></a>
<span class="sourceLineNo">074</span> try {<a name="line.74"></a>
<span class="sourceLineNo">075</span> // empty the map for each region<a name="line.75"></a>
<span class="sourceLineNo">076</span> Map&lt;String, AtomicInteger&gt; blockCountMap = new HashMap&lt;&gt;();<a name="line.76"></a>
<span class="sourceLineNo">077</span><a name="line.77"></a>
<span class="sourceLineNo">078</span> //get table name<a name="line.78"></a>
<span class="sourceLineNo">079</span> String tableName = regionPath.getParent().getName();<a name="line.79"></a>
<span class="sourceLineNo">080</span> int totalBlkCount = 0;<a name="line.80"></a>
<span class="sourceLineNo">081</span><a name="line.81"></a>
<span class="sourceLineNo">082</span> // ignore null<a name="line.82"></a>
<span class="sourceLineNo">083</span> FileStatus[] cfList = fs.listStatus(regionPath, new FSUtils.FamilyDirFilter(fs));<a name="line.83"></a>
<span class="sourceLineNo">084</span> if (null == cfList) {<a name="line.84"></a>
<span class="sourceLineNo">085</span> return;<a name="line.85"></a>
<span class="sourceLineNo">086</span> }<a name="line.86"></a>
<span class="sourceLineNo">087</span><a name="line.87"></a>
<span class="sourceLineNo">088</span> // for each cf, get all the blocks information<a name="line.88"></a>
<span class="sourceLineNo">089</span> for (FileStatus cfStatus : cfList) {<a name="line.89"></a>
<span class="sourceLineNo">090</span> if (!cfStatus.isDirectory()) {<a name="line.90"></a>
<span class="sourceLineNo">091</span> // skip because this is not a CF directory<a name="line.91"></a>
<span class="sourceLineNo">092</span> continue;<a name="line.92"></a>
<span class="sourceLineNo">093</span> }<a name="line.93"></a>
<span class="sourceLineNo">094</span><a name="line.94"></a>
<span class="sourceLineNo">095</span> FileStatus[] storeFileLists = fs.listStatus(cfStatus.getPath());<a name="line.95"></a>
<span class="sourceLineNo">096</span> if (null == storeFileLists) {<a name="line.96"></a>
<span class="sourceLineNo">097</span> continue;<a name="line.97"></a>
<span class="sourceLineNo">098</span> }<a name="line.98"></a>
<span class="sourceLineNo">099</span><a name="line.99"></a>
<span class="sourceLineNo">100</span> for (FileStatus storeFile : storeFileLists) {<a name="line.100"></a>
<span class="sourceLineNo">101</span> BlockLocation[] blkLocations =<a name="line.101"></a>
<span class="sourceLineNo">102</span> fs.getFileBlockLocations(storeFile, 0, storeFile.getLen());<a name="line.102"></a>
<span class="sourceLineNo">103</span> if (null == blkLocations) {<a name="line.103"></a>
<span class="sourceLineNo">104</span> continue;<a name="line.104"></a>
<span class="sourceLineNo">105</span> }<a name="line.105"></a>
<span class="sourceLineNo">106</span><a name="line.106"></a>
<span class="sourceLineNo">107</span> totalBlkCount += blkLocations.length;<a name="line.107"></a>
<span class="sourceLineNo">108</span> for(BlockLocation blk: blkLocations) {<a name="line.108"></a>
<span class="sourceLineNo">109</span> for (String host: blk.getHosts()) {<a name="line.109"></a>
<span class="sourceLineNo">110</span> AtomicInteger count = blockCountMap.get(host);<a name="line.110"></a>
<span class="sourceLineNo">111</span> if (count == null) {<a name="line.111"></a>
<span class="sourceLineNo">112</span> count = new AtomicInteger(0);<a name="line.112"></a>
<span class="sourceLineNo">113</span> blockCountMap.put(host, count);<a name="line.113"></a>
<span class="sourceLineNo">114</span> }<a name="line.114"></a>
<span class="sourceLineNo">115</span> count.incrementAndGet();<a name="line.115"></a>
<span class="sourceLineNo">116</span> }<a name="line.116"></a>
<span class="sourceLineNo">117</span> }<a name="line.117"></a>
<span class="sourceLineNo">118</span> }<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> if (regionToBestLocalityRSMapping != null) {<a name="line.121"></a>
<span class="sourceLineNo">122</span> int largestBlkCount = 0;<a name="line.122"></a>
<span class="sourceLineNo">123</span> String hostToRun = null;<a name="line.123"></a>
<span class="sourceLineNo">124</span> for (Map.Entry&lt;String, AtomicInteger&gt; entry : blockCountMap.entrySet()) {<a name="line.124"></a>
<span class="sourceLineNo">125</span> String host = entry.getKey();<a name="line.125"></a>
<span class="sourceLineNo">126</span><a name="line.126"></a>
<span class="sourceLineNo">127</span> int tmp = entry.getValue().get();<a name="line.127"></a>
<span class="sourceLineNo">128</span> if (tmp &gt; largestBlkCount) {<a name="line.128"></a>
<span class="sourceLineNo">129</span> largestBlkCount = tmp;<a name="line.129"></a>
<span class="sourceLineNo">130</span> hostToRun = host;<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> // empty regions could make this null<a name="line.134"></a>
<span class="sourceLineNo">135</span> if (null == hostToRun) {<a name="line.135"></a>
<span class="sourceLineNo">136</span> return;<a name="line.136"></a>
<span class="sourceLineNo">137</span> }<a name="line.137"></a>
<span class="sourceLineNo">138</span><a name="line.138"></a>
<span class="sourceLineNo">139</span> if (hostToRun.endsWith(".")) {<a name="line.139"></a>
<span class="sourceLineNo">140</span> hostToRun = hostToRun.substring(0, hostToRun.length()-1);<a name="line.140"></a>
<span class="sourceLineNo">141</span> }<a name="line.141"></a>
<span class="sourceLineNo">142</span> String name = tableName + ":" + regionPath.getName();<a name="line.142"></a>
<span class="sourceLineNo">143</span> synchronized (regionToBestLocalityRSMapping) {<a name="line.143"></a>
<span class="sourceLineNo">144</span> regionToBestLocalityRSMapping.put(name, hostToRun);<a name="line.144"></a>
<span class="sourceLineNo">145</span> }<a name="line.145"></a>
<span class="sourceLineNo">146</span> }<a name="line.146"></a>
<span class="sourceLineNo">147</span><a name="line.147"></a>
<span class="sourceLineNo">148</span> if (regionDegreeLocalityMapping != null &amp;&amp; totalBlkCount &gt; 0) {<a name="line.148"></a>
<span class="sourceLineNo">149</span> Map&lt;String, Float&gt; hostLocalityMap = new HashMap&lt;&gt;();<a name="line.149"></a>
<span class="sourceLineNo">150</span> for (Map.Entry&lt;String, AtomicInteger&gt; entry : blockCountMap.entrySet()) {<a name="line.150"></a>
<span class="sourceLineNo">151</span> String host = entry.getKey();<a name="line.151"></a>
<span class="sourceLineNo">152</span> if (host.endsWith(".")) {<a name="line.152"></a>
<span class="sourceLineNo">153</span> host = host.substring(0, host.length() - 1);<a name="line.153"></a>
<span class="sourceLineNo">154</span> }<a name="line.154"></a>
<span class="sourceLineNo">155</span> // Locality is fraction of blocks local to this host.<a name="line.155"></a>
<span class="sourceLineNo">156</span> float locality = ((float)entry.getValue().get()) / totalBlkCount;<a name="line.156"></a>
<span class="sourceLineNo">157</span> hostLocalityMap.put(host, locality);<a name="line.157"></a>
<span class="sourceLineNo">158</span> }<a name="line.158"></a>
<span class="sourceLineNo">159</span> // Put the locality map into the result map, keyed by the encoded name<a name="line.159"></a>
<span class="sourceLineNo">160</span> // of the region.<a name="line.160"></a>
<span class="sourceLineNo">161</span> regionDegreeLocalityMapping.put(regionPath.getName(), hostLocalityMap);<a name="line.161"></a>
<span class="sourceLineNo">162</span> }<a name="line.162"></a>
<span class="sourceLineNo">163</span> } catch (IOException e) {<a name="line.163"></a>
<span class="sourceLineNo">164</span> LOG.warn("Problem scanning file system", e);<a name="line.164"></a>
<span class="sourceLineNo">165</span> } catch (RuntimeException e) {<a name="line.165"></a>
<span class="sourceLineNo">166</span> LOG.warn("Problem scanning file system", e);<a name="line.166"></a>
<span class="sourceLineNo">167</span> }<a name="line.167"></a>
<span class="sourceLineNo">168</span> }<a name="line.168"></a>
<span class="sourceLineNo">169</span>}<a name="line.169"></a>
</pre>
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