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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.ipc;<a name="line.18"></a> |
| <span class="sourceLineNo">019</span><a name="line.19"></a> |
| <span class="sourceLineNo">020</span>import java.util.Deque;<a name="line.20"></a> |
| <span class="sourceLineNo">021</span>import java.util.concurrent.BlockingQueue;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import java.util.concurrent.ConcurrentLinkedDeque;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import java.util.concurrent.atomic.AtomicInteger;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import org.apache.hadoop.conf.Configuration;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import org.apache.hadoop.hbase.Abortable;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span><a name="line.27"></a> |
| <span class="sourceLineNo">028</span>/**<a name="line.28"></a> |
| <span class="sourceLineNo">029</span> * Balanced queue executor with a fastpath. Because this is FIFO, it has no respect for ordering so<a name="line.29"></a> |
| <span class="sourceLineNo">030</span> * a fast path skipping the queuing of Calls if an Handler is available, is possible. Just pass the<a name="line.30"></a> |
| <span class="sourceLineNo">031</span> * Call direct to waiting Handler thread. Try to keep the hot Handlers bubbling rather than let them<a name="line.31"></a> |
| <span class="sourceLineNo">032</span> * go cold and lose context. Idea taken from Apace Kudu (incubating). See<a name="line.32"></a> |
| <span class="sourceLineNo">033</span> * https://gerrit.cloudera.org/#/c/2938/7/src/kudu/rpc/service_queue.h<a name="line.33"></a> |
| <span class="sourceLineNo">034</span> */<a name="line.34"></a> |
| <span class="sourceLineNo">035</span>@InterfaceAudience.Private<a name="line.35"></a> |
| <span class="sourceLineNo">036</span>public class FastPathBalancedQueueRpcExecutor extends BalancedQueueRpcExecutor {<a name="line.36"></a> |
| <span class="sourceLineNo">037</span> // Depends on default behavior of BalancedQueueRpcExecutor being FIFO!<a name="line.37"></a> |
| <span class="sourceLineNo">038</span><a name="line.38"></a> |
| <span class="sourceLineNo">039</span> /*<a name="line.39"></a> |
| <span class="sourceLineNo">040</span> * Stack of Handlers waiting for work.<a name="line.40"></a> |
| <span class="sourceLineNo">041</span> */<a name="line.41"></a> |
| <span class="sourceLineNo">042</span> private final Deque<FastPathRpcHandler> fastPathHandlerStack = new ConcurrentLinkedDeque<>();<a name="line.42"></a> |
| <span class="sourceLineNo">043</span><a name="line.43"></a> |
| <span class="sourceLineNo">044</span> public FastPathBalancedQueueRpcExecutor(final String name, final int handlerCount,<a name="line.44"></a> |
| <span class="sourceLineNo">045</span> final int maxQueueLength, final PriorityFunction priority, final Configuration conf,<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> final Abortable abortable) {<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> super(name, handlerCount, maxQueueLength, priority, conf, abortable);<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> }<a name="line.48"></a> |
| <span class="sourceLineNo">049</span><a name="line.49"></a> |
| <span class="sourceLineNo">050</span> public FastPathBalancedQueueRpcExecutor(final String name, final int handlerCount,<a name="line.50"></a> |
| <span class="sourceLineNo">051</span> final String callQueueType, final int maxQueueLength, final PriorityFunction priority,<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> final Configuration conf, final Abortable abortable) {<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> super(name, handlerCount, callQueueType, maxQueueLength, priority, conf, abortable);<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> }<a name="line.54"></a> |
| <span class="sourceLineNo">055</span><a name="line.55"></a> |
| <span class="sourceLineNo">056</span> @Override<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> protected RpcHandler getHandler(final String name, final double handlerFailureThreshhold,<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> final int handlerCount, final BlockingQueue<CallRunner> q,<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> final AtomicInteger activeHandlerCount, final AtomicInteger failedHandlerCount,<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> final Abortable abortable) {<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> return new FastPathRpcHandler(name, handlerFailureThreshhold, handlerCount, q,<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> activeHandlerCount, failedHandlerCount, abortable, fastPathHandlerStack);<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> }<a name="line.63"></a> |
| <span class="sourceLineNo">064</span><a name="line.64"></a> |
| <span class="sourceLineNo">065</span> @Override<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> public boolean dispatch(CallRunner callTask) {<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> // FastPathHandlers don't check queue limits, so if we're completely shut down<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> // we have to prevent ourselves from using the handler in the first place<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> if (currentQueueLimit == 0) {<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> return false;<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> }<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> FastPathRpcHandler handler = popReadyHandler();<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> return handler != null ? handler.loadCallRunner(callTask) : super.dispatch(callTask);<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> /** Returns Pop a Handler instance if one available ready-to-go or else return null. */<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> private FastPathRpcHandler popReadyHandler() {<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> return this.fastPathHandlerStack.poll();<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> }<a name="line.79"></a> |
| <span class="sourceLineNo">080</span>}<a name="line.80"></a> |
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