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Posted to commits@hbase.apache.org by mi...@apache.org on 2016/03/08 19:06:01 UTC
[26/34] hbase-site git commit: Published site at
46cc3d4972d8db478c86e9848afed523cb6dc866.
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/58f51408/devapidocs/src-html/org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html
----------------------------------------------------------------------
diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html b/devapidocs/src-html/org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html
index ce13124..4a62e5a 100644
--- a/devapidocs/src-html/org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html
@@ -25,392 +25,345 @@
<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 java.io.EOFException;<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.io.SyncFailedException;<a name="line.22"></a>
-<span class="sourceLineNo">023</span>import java.lang.reflect.UndeclaredThrowableException;<a name="line.23"></a>
-<span class="sourceLineNo">024</span>import java.net.ConnectException;<a name="line.24"></a>
-<span class="sourceLineNo">025</span>import java.net.SocketTimeoutException;<a name="line.25"></a>
-<span class="sourceLineNo">026</span>import java.nio.channels.ClosedChannelException;<a name="line.26"></a>
-<span class="sourceLineNo">027</span>import java.util.Map.Entry;<a name="line.27"></a>
-<span class="sourceLineNo">028</span>import java.util.concurrent.ConcurrentHashMap;<a name="line.28"></a>
-<span class="sourceLineNo">029</span>import java.util.concurrent.ConcurrentMap;<a name="line.29"></a>
-<span class="sourceLineNo">030</span>import java.util.concurrent.TimeoutException;<a name="line.30"></a>
-<span class="sourceLineNo">031</span><a name="line.31"></a>
-<span class="sourceLineNo">032</span>import org.apache.commons.lang.mutable.MutableBoolean;<a name="line.32"></a>
-<span class="sourceLineNo">033</span>import org.apache.commons.logging.Log;<a name="line.33"></a>
-<span class="sourceLineNo">034</span>import org.apache.commons.logging.LogFactory;<a name="line.34"></a>
-<span class="sourceLineNo">035</span>import org.apache.hadoop.conf.Configuration;<a name="line.35"></a>
-<span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.DoNotRetryIOException;<a name="line.36"></a>
-<span class="sourceLineNo">037</span>import org.apache.hadoop.hbase.HConstants;<a name="line.37"></a>
-<span class="sourceLineNo">038</span>import org.apache.hadoop.hbase.ServerName;<a name="line.38"></a>
-<span class="sourceLineNo">039</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.39"></a>
-<span class="sourceLineNo">040</span>import org.apache.hadoop.hbase.exceptions.ConnectionClosingException;<a name="line.40"></a>
-<span class="sourceLineNo">041</span>import org.apache.hadoop.hbase.exceptions.PreemptiveFastFailException;<a name="line.41"></a>
-<span class="sourceLineNo">042</span>import org.apache.hadoop.hbase.ipc.FailedServerException;<a name="line.42"></a>
-<span class="sourceLineNo">043</span>import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;<a name="line.43"></a>
-<span class="sourceLineNo">044</span>import org.apache.hadoop.ipc.RemoteException;<a name="line.44"></a>
-<span class="sourceLineNo">045</span><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 concrete {@link RetryingCallerInterceptor} class that implements the preemptive fast fail<a name="line.48"></a>
-<span class="sourceLineNo">049</span> * feature.<a name="line.49"></a>
-<span class="sourceLineNo">050</span> * <a name="line.50"></a>
-<span class="sourceLineNo">051</span> * The motivation is as follows : <a name="line.51"></a>
-<span class="sourceLineNo">052</span> * In case where a large number of clients try and talk to a particular region server in hbase, if<a name="line.52"></a>
-<span class="sourceLineNo">053</span> * the region server goes down due to network problems, we might end up in a scenario where<a name="line.53"></a>
-<span class="sourceLineNo">054</span> * the clients would go into a state where they all start to retry.<a name="line.54"></a>
-<span class="sourceLineNo">055</span> * This behavior will set off many of the threads in pretty much the same path and they all would be<a name="line.55"></a>
-<span class="sourceLineNo">056</span> * sleeping giving rise to a state where the client either needs to create more threads to send new<a name="line.56"></a>
-<span class="sourceLineNo">057</span> * requests to other hbase machines or block because the client cannot create anymore threads.<a name="line.57"></a>
-<span class="sourceLineNo">058</span> * <a name="line.58"></a>
-<span class="sourceLineNo">059</span> * In most cases the clients might prefer to have a bound on the number of threads that are created<a name="line.59"></a>
-<span class="sourceLineNo">060</span> * in order to send requests to hbase. This would mostly result in the client thread starvation.<a name="line.60"></a>
-<span class="sourceLineNo">061</span> * <a name="line.61"></a>
-<span class="sourceLineNo">062</span> * To circumvent this problem, the approach that is being taken here under is to let 1 of the many<a name="line.62"></a>
-<span class="sourceLineNo">063</span> * threads who are trying to contact the regionserver with connection problems and let the other<a name="line.63"></a>
-<span class="sourceLineNo">064</span> * threads get a {@link PreemptiveFastFailException} so that they can move on and take other<a name="line.64"></a>
-<span class="sourceLineNo">065</span> * requests.<a name="line.65"></a>
-<span class="sourceLineNo">066</span> * <a name="line.66"></a>
-<span class="sourceLineNo">067</span> * This would give the client more flexibility on the kind of action he would want to take in cases<a name="line.67"></a>
-<span class="sourceLineNo">068</span> * where the regionserver is down. He can either discard the requests and send a nack upstream<a name="line.68"></a>
-<span class="sourceLineNo">069</span> * faster or have an application level retry or buffer the requests up so as to send them down to<a name="line.69"></a>
-<span class="sourceLineNo">070</span> * hbase later.<a name="line.70"></a>
-<span class="sourceLineNo">071</span> *<a name="line.71"></a>
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-<span class="sourceLineNo">073</span>@InterfaceAudience.Private<a name="line.73"></a>
-<span class="sourceLineNo">074</span>class PreemptiveFastFailInterceptor extends RetryingCallerInterceptor {<a name="line.74"></a>
-<span class="sourceLineNo">075</span><a name="line.75"></a>
-<span class="sourceLineNo">076</span> private static final Log LOG = LogFactory<a name="line.76"></a>
-<span class="sourceLineNo">077</span> .getLog(PreemptiveFastFailInterceptor.class);<a name="line.77"></a>
-<span class="sourceLineNo">078</span><a name="line.78"></a>
-<span class="sourceLineNo">079</span> // amount of time to wait before we consider a server to be in fast fail<a name="line.79"></a>
-<span class="sourceLineNo">080</span> // mode<a name="line.80"></a>
-<span class="sourceLineNo">081</span> protected final long fastFailThresholdMilliSec;<a name="line.81"></a>
-<span class="sourceLineNo">082</span><a name="line.82"></a>
-<span class="sourceLineNo">083</span> // Keeps track of failures when we cannot talk to a server. Helps in<a name="line.83"></a>
-<span class="sourceLineNo">084</span> // fast failing clients if the server is down for a long time.<a name="line.84"></a>
-<span class="sourceLineNo">085</span> protected final ConcurrentMap<ServerName, FailureInfo> repeatedFailuresMap =<a name="line.85"></a>
-<span class="sourceLineNo">086</span> new ConcurrentHashMap<ServerName, FailureInfo>();<a name="line.86"></a>
-<span class="sourceLineNo">087</span><a name="line.87"></a>
-<span class="sourceLineNo">088</span> // We populate repeatedFailuresMap every time there is a failure. So, to<a name="line.88"></a>
-<span class="sourceLineNo">089</span> // keep it from growing unbounded, we garbage collect the failure information<a name="line.89"></a>
-<span class="sourceLineNo">090</span> // every cleanupInterval.<a name="line.90"></a>
-<span class="sourceLineNo">091</span> protected final long failureMapCleanupIntervalMilliSec;<a name="line.91"></a>
-<span class="sourceLineNo">092</span><a name="line.92"></a>
-<span class="sourceLineNo">093</span> protected volatile long lastFailureMapCleanupTimeMilliSec;<a name="line.93"></a>
-<span class="sourceLineNo">094</span><a name="line.94"></a>
-<span class="sourceLineNo">095</span> // clear failure Info. Used to clean out all entries.<a name="line.95"></a>
-<span class="sourceLineNo">096</span> // A safety valve, in case the client does not exit the<a name="line.96"></a>
-<span class="sourceLineNo">097</span> // fast fail mode for any reason.<a name="line.97"></a>
-<span class="sourceLineNo">098</span> private long fastFailClearingTimeMilliSec;<a name="line.98"></a>
-<span class="sourceLineNo">099</span><a name="line.99"></a>
-<span class="sourceLineNo">100</span> private final ThreadLocal<MutableBoolean> threadRetryingInFastFailMode =<a name="line.100"></a>
-<span class="sourceLineNo">101</span> new ThreadLocal<MutableBoolean>();<a name="line.101"></a>
-<span class="sourceLineNo">102</span><a name="line.102"></a>
-<span class="sourceLineNo">103</span> public PreemptiveFastFailInterceptor(Configuration conf) {<a name="line.103"></a>
-<span class="sourceLineNo">104</span> this.fastFailThresholdMilliSec = conf.getLong(<a name="line.104"></a>
-<span class="sourceLineNo">105</span> HConstants.HBASE_CLIENT_FAST_FAIL_THREASHOLD_MS,<a name="line.105"></a>
-<span class="sourceLineNo">106</span> HConstants.HBASE_CLIENT_FAST_FAIL_THREASHOLD_MS_DEFAULT);<a name="line.106"></a>
-<span class="sourceLineNo">107</span> this.failureMapCleanupIntervalMilliSec = conf.getLong(<a name="line.107"></a>
-<span class="sourceLineNo">108</span> HConstants.HBASE_CLIENT_FAST_FAIL_CLEANUP_MS_DURATION_MS,<a name="line.108"></a>
-<span class="sourceLineNo">109</span> HConstants.HBASE_CLIENT_FAST_FAIL_CLEANUP_DURATION_MS_DEFAULT);<a name="line.109"></a>
-<span class="sourceLineNo">110</span> lastFailureMapCleanupTimeMilliSec = EnvironmentEdgeManager.currentTime();<a name="line.110"></a>
-<span class="sourceLineNo">111</span> }<a name="line.111"></a>
-<span class="sourceLineNo">112</span><a name="line.112"></a>
-<span class="sourceLineNo">113</span> public void intercept(FastFailInterceptorContext context)<a name="line.113"></a>
-<span class="sourceLineNo">114</span> throws PreemptiveFastFailException {<a name="line.114"></a>
-<span class="sourceLineNo">115</span> context.setFailureInfo(repeatedFailuresMap.get(context.getServer()));<a name="line.115"></a>
-<span class="sourceLineNo">116</span> if (inFastFailMode(context.getServer()) && !currentThreadInFastFailMode()) {<a name="line.116"></a>
-<span class="sourceLineNo">117</span> // In Fast-fail mode, all but one thread will fast fail. Check<a name="line.117"></a>
-<span class="sourceLineNo">118</span> // if we are that one chosen thread.<a name="line.118"></a>
-<span class="sourceLineNo">119</span> context.setRetryDespiteFastFailMode(shouldRetryInspiteOfFastFail(context<a name="line.119"></a>
-<span class="sourceLineNo">120</span> .getFailureInfo()));<a name="line.120"></a>
-<span class="sourceLineNo">121</span> if (!context.isRetryDespiteFastFailMode()) { // we don't have to retry<a name="line.121"></a>
-<span class="sourceLineNo">122</span> LOG.debug("Throwing PFFE : " + context.getFailureInfo() + " tries : "<a name="line.122"></a>
-<span class="sourceLineNo">123</span> + context.getTries());<a name="line.123"></a>
-<span class="sourceLineNo">124</span> throw new PreemptiveFastFailException(<a name="line.124"></a>
-<span class="sourceLineNo">125</span> context.getFailureInfo().numConsecutiveFailures.get(),<a name="line.125"></a>
-<span class="sourceLineNo">126</span> context.getFailureInfo().timeOfFirstFailureMilliSec,<a name="line.126"></a>
-<span class="sourceLineNo">127</span> context.getFailureInfo().timeOfLatestAttemptMilliSec, context.getServer());<a name="line.127"></a>
-<span class="sourceLineNo">128</span> }<a name="line.128"></a>
-<span class="sourceLineNo">129</span> }<a name="line.129"></a>
-<span class="sourceLineNo">130</span> context.setDidTry(true);<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> public void handleFailure(FastFailInterceptorContext context,<a name="line.133"></a>
-<span class="sourceLineNo">134</span> Throwable t) throws IOException {<a name="line.134"></a>
-<span class="sourceLineNo">135</span> handleThrowable(t, context.getServer(),<a name="line.135"></a>
-<span class="sourceLineNo">136</span> context.getCouldNotCommunicateWithServer());<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> public void updateFailureInfo(FastFailInterceptorContext context) {<a name="line.139"></a>
-<span class="sourceLineNo">140</span> updateFailureInfoForServer(context.getServer(), context.getFailureInfo(),<a name="line.140"></a>
-<span class="sourceLineNo">141</span> context.didTry(), context.getCouldNotCommunicateWithServer()<a name="line.141"></a>
-<span class="sourceLineNo">142</span> .booleanValue(), context.isRetryDespiteFastFailMode());<a name="line.142"></a>
-<span class="sourceLineNo">143</span> }<a name="line.143"></a>
-<span class="sourceLineNo">144</span><a name="line.144"></a>
-<span class="sourceLineNo">145</span> /**<a name="line.145"></a>
-<span class="sourceLineNo">146</span> * Handles failures encountered when communicating with a server.<a name="line.146"></a>
-<span class="sourceLineNo">147</span> *<a name="line.147"></a>
-<span class="sourceLineNo">148</span> * Updates the FailureInfo in repeatedFailuresMap to reflect the failure.<a name="line.148"></a>
-<span class="sourceLineNo">149</span> * Throws RepeatedConnectException if the client is in Fast fail mode.<a name="line.149"></a>
-<span class="sourceLineNo">150</span> *<a name="line.150"></a>
-<span class="sourceLineNo">151</span> * @param serverName<a name="line.151"></a>
-<span class="sourceLineNo">152</span> * @param t<a name="line.152"></a>
-<span class="sourceLineNo">153</span> * - the throwable to be handled.<a name="line.153"></a>
-<span class="sourceLineNo">154</span> * @throws PreemptiveFastFailException<a name="line.154"></a>
-<span class="sourceLineNo">155</span> */<a name="line.155"></a>
-<span class="sourceLineNo">156</span> private void handleFailureToServer(ServerName serverName, Throwable t) {<a name="line.156"></a>
-<span class="sourceLineNo">157</span> if (serverName == null || t == null) {<a name="line.157"></a>
-<span class="sourceLineNo">158</span> return;<a name="line.158"></a>
-<span class="sourceLineNo">159</span> }<a name="line.159"></a>
-<span class="sourceLineNo">160</span> long currentTime = EnvironmentEdgeManager.currentTime();<a name="line.160"></a>
-<span class="sourceLineNo">161</span> FailureInfo fInfo = repeatedFailuresMap.get(serverName);<a name="line.161"></a>
-<span class="sourceLineNo">162</span> if (fInfo == null) {<a name="line.162"></a>
-<span class="sourceLineNo">163</span> fInfo = new FailureInfo(currentTime);<a name="line.163"></a>
-<span class="sourceLineNo">164</span> FailureInfo oldfInfo = repeatedFailuresMap.putIfAbsent(serverName, fInfo);<a name="line.164"></a>
-<span class="sourceLineNo">165</span><a name="line.165"></a>
-<span class="sourceLineNo">166</span> if (oldfInfo != null) {<a name="line.166"></a>
-<span class="sourceLineNo">167</span> fInfo = oldfInfo;<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>
-<span class="sourceLineNo">170</span> fInfo.timeOfLatestAttemptMilliSec = currentTime;<a name="line.170"></a>
-<span class="sourceLineNo">171</span> fInfo.numConsecutiveFailures.incrementAndGet();<a name="line.171"></a>
-<span class="sourceLineNo">172</span> }<a name="line.172"></a>
-<span class="sourceLineNo">173</span><a name="line.173"></a>
-<span class="sourceLineNo">174</span> public void handleThrowable(Throwable t1, ServerName serverName,<a name="line.174"></a>
-<span class="sourceLineNo">175</span> MutableBoolean couldNotCommunicateWithServer) throws IOException {<a name="line.175"></a>
-<span class="sourceLineNo">176</span> Throwable t2 = translateException(t1);<a name="line.176"></a>
-<span class="sourceLineNo">177</span> boolean isLocalException = !(t2 instanceof RemoteException);<a name="line.177"></a>
-<span class="sourceLineNo">178</span> if (isLocalException && isConnectionException(t2)) {<a name="line.178"></a>
+<span class="sourceLineNo">020</span>import java.io.IOException;<a name="line.20"></a>
+<span class="sourceLineNo">021</span>import java.util.Map.Entry;<a name="line.21"></a>
+<span class="sourceLineNo">022</span>import java.util.concurrent.ConcurrentHashMap;<a name="line.22"></a>
+<span class="sourceLineNo">023</span>import java.util.concurrent.ConcurrentMap;<a name="line.23"></a>
+<span class="sourceLineNo">024</span><a name="line.24"></a>
+<span class="sourceLineNo">025</span>import org.apache.commons.lang.mutable.MutableBoolean;<a name="line.25"></a>
+<span class="sourceLineNo">026</span>import org.apache.commons.logging.Log;<a name="line.26"></a>
+<span class="sourceLineNo">027</span>import org.apache.commons.logging.LogFactory;<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.HConstants;<a name="line.29"></a>
+<span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.ServerName;<a name="line.30"></a>
+<span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.31"></a>
+<span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.exceptions.ClientExceptionsUtil;<a name="line.32"></a>
+<span class="sourceLineNo">033</span>import org.apache.hadoop.hbase.exceptions.PreemptiveFastFailException;<a name="line.33"></a>
+<span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.ipc.CallTimeoutException;<a name="line.34"></a>
+<span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;<a name="line.35"></a>
+<span class="sourceLineNo">036</span>import org.apache.hadoop.ipc.RemoteException;<a name="line.36"></a>
+<span class="sourceLineNo">037</span><a name="line.37"></a>
+<span class="sourceLineNo">038</span>import com.google.common.annotations.VisibleForTesting;<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> * <a name="line.41"></a>
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+<span class="sourceLineNo">043</span> * feature.<a name="line.43"></a>
+<span class="sourceLineNo">044</span> * <a name="line.44"></a>
+<span class="sourceLineNo">045</span> * The motivation is as follows : <a name="line.45"></a>
+<span class="sourceLineNo">046</span> * In case where a large number of clients try and talk to a particular region server in hbase, if<a name="line.46"></a>
+<span class="sourceLineNo">047</span> * the region server goes down due to network problems, we might end up in a scenario where<a name="line.47"></a>
+<span class="sourceLineNo">048</span> * the clients would go into a state where they all start to retry.<a name="line.48"></a>
+<span class="sourceLineNo">049</span> * This behavior will set off many of the threads in pretty much the same path and they all would be<a name="line.49"></a>
+<span class="sourceLineNo">050</span> * sleeping giving rise to a state where the client either needs to create more threads to send new<a name="line.50"></a>
+<span class="sourceLineNo">051</span> * requests to other hbase machines or block because the client cannot create anymore threads.<a name="line.51"></a>
+<span class="sourceLineNo">052</span> * <a name="line.52"></a>
+<span class="sourceLineNo">053</span> * In most cases the clients might prefer to have a bound on the number of threads that are created<a name="line.53"></a>
+<span class="sourceLineNo">054</span> * in order to send requests to hbase. This would mostly result in the client thread starvation.<a name="line.54"></a>
+<span class="sourceLineNo">055</span> * <a name="line.55"></a>
+<span class="sourceLineNo">056</span> * To circumvent this problem, the approach that is being taken here under is to let 1 of the many<a name="line.56"></a>
+<span class="sourceLineNo">057</span> * threads who are trying to contact the regionserver with connection problems and let the other<a name="line.57"></a>
+<span class="sourceLineNo">058</span> * threads get a {@link PreemptiveFastFailException} so that they can move on and take other<a name="line.58"></a>
+<span class="sourceLineNo">059</span> * requests.<a name="line.59"></a>
+<span class="sourceLineNo">060</span> * <a name="line.60"></a>
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+<span class="sourceLineNo">063</span> * faster or have an application level retry or buffer the requests up so as to send them down to<a name="line.63"></a>
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+<span class="sourceLineNo">069</span><a name="line.69"></a>
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+<span class="sourceLineNo">071</span> .getLog(PreemptiveFastFailInterceptor.class);<a name="line.71"></a>
+<span class="sourceLineNo">072</span><a name="line.72"></a>
+<span class="sourceLineNo">073</span> // amount of time to wait before we consider a server to be in fast fail<a name="line.73"></a>
+<span class="sourceLineNo">074</span> // mode<a name="line.74"></a>
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+<span class="sourceLineNo">078</span> // fast failing clients if the server is down for a long time.<a name="line.78"></a>
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