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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.client;<a name="line.18"></a> |
| <span class="sourceLineNo">019</span><a name="line.19"></a> |
| <span class="sourceLineNo">020</span>import static org.apache.hadoop.hbase.exceptions.ClientExceptionsUtil.findException;<a name="line.20"></a> |
| <span class="sourceLineNo">021</span>import static org.apache.hadoop.hbase.exceptions.ClientExceptionsUtil.isMetaClearingException;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span><a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import java.util.Arrays;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import java.util.function.Consumer;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import java.util.function.Function;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import org.apache.commons.lang3.ObjectUtils;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span>import org.apache.hadoop.hbase.HRegionLocation;<a name="line.27"></a> |
| <span class="sourceLineNo">028</span>import org.apache.hadoop.hbase.RegionLocations;<a name="line.28"></a> |
| <span class="sourceLineNo">029</span>import org.apache.hadoop.hbase.exceptions.RegionMovedException;<a name="line.29"></a> |
| <span class="sourceLineNo">030</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>import org.slf4j.Logger;<a name="line.31"></a> |
| <span class="sourceLineNo">032</span>import org.slf4j.LoggerFactory;<a name="line.32"></a> |
| <span class="sourceLineNo">033</span><a name="line.33"></a> |
| <span class="sourceLineNo">034</span>/**<a name="line.34"></a> |
| <span class="sourceLineNo">035</span> * Helper class for asynchronous region locator.<a name="line.35"></a> |
| <span class="sourceLineNo">036</span> */<a name="line.36"></a> |
| <span class="sourceLineNo">037</span>@InterfaceAudience.Private<a name="line.37"></a> |
| <span class="sourceLineNo">038</span>final class AsyncRegionLocatorHelper {<a name="line.38"></a> |
| <span class="sourceLineNo">039</span><a name="line.39"></a> |
| <span class="sourceLineNo">040</span> private static final Logger LOG = LoggerFactory.getLogger(AsyncRegionLocatorHelper.class);<a name="line.40"></a> |
| <span class="sourceLineNo">041</span><a name="line.41"></a> |
| <span class="sourceLineNo">042</span> private AsyncRegionLocatorHelper() {<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> }<a name="line.43"></a> |
| <span class="sourceLineNo">044</span><a name="line.44"></a> |
| <span class="sourceLineNo">045</span> static boolean canUpdateOnError(HRegionLocation loc, HRegionLocation oldLoc) {<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> // Do not need to update if no such location, or the location is newer, or the location is not<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> // the same with us<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> if (loc == null || loc.getServerName() == null) {<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> return false;<a name="line.49"></a> |
| <span class="sourceLineNo">050</span> }<a name="line.50"></a> |
| <span class="sourceLineNo">051</span> if (oldLoc == null || oldLoc.getServerName() == null) {<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> return false;<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> }<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> return oldLoc.getSeqNum() <= loc.getSeqNum()<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> && oldLoc.getServerName().equals(loc.getServerName());<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> static void updateCachedLocationOnError(HRegionLocation loc, Throwable exception,<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> Function<HRegionLocation, HRegionLocation> cachedLocationSupplier,<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> Consumer<HRegionLocation> addToCache, Consumer<HRegionLocation> removeFromCache,<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> MetricsConnection metrics) {<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> HRegionLocation oldLoc = cachedLocationSupplier.apply(loc);<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> if (LOG.isDebugEnabled()) {<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> LOG.debug("Try updating {} , the old value is {}, error={}", loc, oldLoc,<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> exception != null ? exception.toString() : "none");<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> }<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> if (!canUpdateOnError(loc, oldLoc)) {<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> return;<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> }<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> Throwable cause = findException(exception);<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> if (LOG.isDebugEnabled()) {<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> LOG.debug("The actual exception when updating {} is {}", loc,<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> cause != null ? cause.toString() : "none");<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> }<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> if (cause == null || !isMetaClearingException(cause)) {<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> LOG.debug("Will not update {} because the exception is null or not the one we care about",<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> loc);<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> return;<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> }<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> if (cause instanceof RegionMovedException) {<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> RegionMovedException rme = (RegionMovedException) cause;<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> HRegionLocation newLoc =<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> new HRegionLocation(loc.getRegion(), rme.getServerName(), rme.getLocationSeqNum());<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> LOG.debug("Try updating {} with the new location {} constructed by {}", loc, newLoc,<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> rme.toString());<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> addToCache.accept(newLoc);<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> } else {<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> LOG.debug("Try removing {} from cache", loc);<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> if (metrics != null) {<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> metrics.incrCacheDroppingExceptions(exception);<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> }<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> removeFromCache.accept(loc);<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><a name="line.95"></a> |
| <span class="sourceLineNo">096</span> static RegionLocations createRegionLocations(HRegionLocation loc) {<a name="line.96"></a> |
| <span class="sourceLineNo">097</span> int replicaId = loc.getRegion().getReplicaId();<a name="line.97"></a> |
| <span class="sourceLineNo">098</span> HRegionLocation[] locs = new HRegionLocation[replicaId + 1];<a name="line.98"></a> |
| <span class="sourceLineNo">099</span> locs[replicaId] = loc;<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> return new RegionLocations(locs);<a name="line.100"></a> |
| <span class="sourceLineNo">101</span> }<a name="line.101"></a> |
| <span class="sourceLineNo">102</span><a name="line.102"></a> |
| <span class="sourceLineNo">103</span> /**<a name="line.103"></a> |
| <span class="sourceLineNo">104</span> * Create a new {@link RegionLocations} based on the given {@code oldLocs}, and replace the<a name="line.104"></a> |
| <span class="sourceLineNo">105</span> * location for the given {@code replicaId} with the given {@code loc}.<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> * <p/><a name="line.106"></a> |
| <span class="sourceLineNo">107</span> * All the {@link RegionLocations} in async locator related class are immutable because we want to<a name="line.107"></a> |
| <span class="sourceLineNo">108</span> * access them concurrently, so here we need to create a new one, instead of calling<a name="line.108"></a> |
| <span class="sourceLineNo">109</span> * {@link RegionLocations#updateLocation(HRegionLocation, boolean, boolean)}.<a name="line.109"></a> |
| <span class="sourceLineNo">110</span> */<a name="line.110"></a> |
| <span class="sourceLineNo">111</span> static RegionLocations replaceRegionLocation(RegionLocations oldLocs, HRegionLocation loc) {<a name="line.111"></a> |
| <span class="sourceLineNo">112</span> int replicaId = loc.getRegion().getReplicaId();<a name="line.112"></a> |
| <span class="sourceLineNo">113</span> HRegionLocation[] locs = oldLocs.getRegionLocations();<a name="line.113"></a> |
| <span class="sourceLineNo">114</span> locs = Arrays.copyOf(locs, Math.max(replicaId + 1, locs.length));<a name="line.114"></a> |
| <span class="sourceLineNo">115</span> locs[replicaId] = loc;<a name="line.115"></a> |
| <span class="sourceLineNo">116</span> return new RegionLocations(locs);<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> * Create a new {@link RegionLocations} based on the given {@code oldLocs}, and remove the<a name="line.120"></a> |
| <span class="sourceLineNo">121</span> * location for the given {@code replicaId}.<a name="line.121"></a> |
| <span class="sourceLineNo">122</span> * <p/><a name="line.122"></a> |
| <span class="sourceLineNo">123</span> * All the {@link RegionLocations} in async locator related class are immutable because we want to<a name="line.123"></a> |
| <span class="sourceLineNo">124</span> * access them concurrently, so here we need to create a new one, instead of calling<a name="line.124"></a> |
| <span class="sourceLineNo">125</span> * {@link RegionLocations#remove(int)}.<a name="line.125"></a> |
| <span class="sourceLineNo">126</span> */<a name="line.126"></a> |
| <span class="sourceLineNo">127</span> static RegionLocations removeRegionLocation(RegionLocations oldLocs, int replicaId) {<a name="line.127"></a> |
| <span class="sourceLineNo">128</span> HRegionLocation[] locs = oldLocs.getRegionLocations();<a name="line.128"></a> |
| <span class="sourceLineNo">129</span> if (locs.length < replicaId + 1) {<a name="line.129"></a> |
| <span class="sourceLineNo">130</span> // Here we do not modify the oldLocs so it is safe to return it.<a name="line.130"></a> |
| <span class="sourceLineNo">131</span> return oldLocs;<a name="line.131"></a> |
| <span class="sourceLineNo">132</span> }<a name="line.132"></a> |
| <span class="sourceLineNo">133</span> locs = Arrays.copyOf(locs, locs.length);<a name="line.133"></a> |
| <span class="sourceLineNo">134</span> locs[replicaId] = null;<a name="line.134"></a> |
| <span class="sourceLineNo">135</span> if (ObjectUtils.firstNonNull(locs) != null) {<a name="line.135"></a> |
| <span class="sourceLineNo">136</span> return new RegionLocations(locs);<a name="line.136"></a> |
| <span class="sourceLineNo">137</span> } else {<a name="line.137"></a> |
| <span class="sourceLineNo">138</span> // if all the locations are null, just return null<a name="line.138"></a> |
| <span class="sourceLineNo">139</span> return null;<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><a name="line.142"></a> |
| <span class="sourceLineNo">143</span> static boolean isGood(RegionLocations locs, int replicaId) {<a name="line.143"></a> |
| <span class="sourceLineNo">144</span> if (locs == null) {<a name="line.144"></a> |
| <span class="sourceLineNo">145</span> return false;<a name="line.145"></a> |
| <span class="sourceLineNo">146</span> }<a name="line.146"></a> |
| <span class="sourceLineNo">147</span> HRegionLocation loc = locs.getRegionLocation(replicaId);<a name="line.147"></a> |
| <span class="sourceLineNo">148</span> return loc != null && loc.getServerName() != 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> |
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| </pre> |
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