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| <pre><span class="source-line-no">001</span><span id="line-1">/*</span> |
| <span class="source-line-no">002</span><span id="line-2"> * Licensed to the Apache Software Foundation (ASF) under one</span> |
| <span class="source-line-no">003</span><span id="line-3"> * or more contributor license agreements. See the NOTICE file</span> |
| <span class="source-line-no">004</span><span id="line-4"> * distributed with this work for additional information</span> |
| <span class="source-line-no">005</span><span id="line-5"> * regarding copyright ownership. The ASF licenses this file</span> |
| <span class="source-line-no">006</span><span id="line-6"> * to you under the Apache License, Version 2.0 (the</span> |
| <span class="source-line-no">007</span><span id="line-7"> * "License"); you may not use this file except in compliance</span> |
| <span class="source-line-no">008</span><span id="line-8"> * with the License. You may obtain a copy of the License at</span> |
| <span class="source-line-no">009</span><span id="line-9"> *</span> |
| <span class="source-line-no">010</span><span id="line-10"> * http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="source-line-no">011</span><span id="line-11"> *</span> |
| <span class="source-line-no">012</span><span id="line-12"> * Unless required by applicable law or agreed to in writing, software</span> |
| <span class="source-line-no">013</span><span id="line-13"> * distributed under the License is distributed on an "AS IS" BASIS,</span> |
| <span class="source-line-no">014</span><span id="line-14"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span> |
| <span class="source-line-no">015</span><span id="line-15"> * See the License for the specific language governing permissions and</span> |
| <span class="source-line-no">016</span><span id="line-16"> * limitations under the License.</span> |
| <span class="source-line-no">017</span><span id="line-17"> */</span> |
| <span class="source-line-no">018</span><span id="line-18">package org.apache.hadoop.hbase.ipc;</span> |
| <span class="source-line-no">019</span><span id="line-19"></span> |
| <span class="source-line-no">020</span><span id="line-20">import java.util.Deque;</span> |
| <span class="source-line-no">021</span><span id="line-21">import java.util.concurrent.BlockingQueue;</span> |
| <span class="source-line-no">022</span><span id="line-22">import java.util.concurrent.ConcurrentLinkedDeque;</span> |
| <span class="source-line-no">023</span><span id="line-23">import java.util.concurrent.atomic.AtomicInteger;</span> |
| <span class="source-line-no">024</span><span id="line-24">import org.apache.hadoop.conf.Configuration;</span> |
| <span class="source-line-no">025</span><span id="line-25">import org.apache.hadoop.hbase.Abortable;</span> |
| <span class="source-line-no">026</span><span id="line-26">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">027</span><span id="line-27"></span> |
| <span class="source-line-no">028</span><span id="line-28">/**</span> |
| <span class="source-line-no">029</span><span id="line-29"> * Balanced queue executor with a fastpath. Because this is FIFO, it has no respect for ordering so</span> |
| <span class="source-line-no">030</span><span id="line-30"> * a fast path skipping the queuing of Calls if an Handler is available, is possible. Just pass the</span> |
| <span class="source-line-no">031</span><span id="line-31"> * Call direct to waiting Handler thread. Try to keep the hot Handlers bubbling rather than let them</span> |
| <span class="source-line-no">032</span><span id="line-32"> * go cold and lose context. Idea taken from Apace Kudu (incubating). See</span> |
| <span class="source-line-no">033</span><span id="line-33"> * https://gerrit.cloudera.org/#/c/2938/7/src/kudu/rpc/service_queue.h</span> |
| <span class="source-line-no">034</span><span id="line-34"> */</span> |
| <span class="source-line-no">035</span><span id="line-35">@InterfaceAudience.Private</span> |
| <span class="source-line-no">036</span><span id="line-36">public class FastPathBalancedQueueRpcExecutor extends BalancedQueueRpcExecutor {</span> |
| <span class="source-line-no">037</span><span id="line-37"> // Depends on default behavior of BalancedQueueRpcExecutor being FIFO!</span> |
| <span class="source-line-no">038</span><span id="line-38"></span> |
| <span class="source-line-no">039</span><span id="line-39"> /*</span> |
| <span class="source-line-no">040</span><span id="line-40"> * Stack of Handlers waiting for work.</span> |
| <span class="source-line-no">041</span><span id="line-41"> */</span> |
| <span class="source-line-no">042</span><span id="line-42"> private final Deque<FastPathRpcHandler> fastPathHandlerStack = new ConcurrentLinkedDeque<>();</span> |
| <span class="source-line-no">043</span><span id="line-43"></span> |
| <span class="source-line-no">044</span><span id="line-44"> public FastPathBalancedQueueRpcExecutor(final String name, final int handlerCount,</span> |
| <span class="source-line-no">045</span><span id="line-45"> final int maxQueueLength, final PriorityFunction priority, final Configuration conf,</span> |
| <span class="source-line-no">046</span><span id="line-46"> final Abortable abortable) {</span> |
| <span class="source-line-no">047</span><span id="line-47"> super(name, handlerCount, maxQueueLength, priority, conf, abortable);</span> |
| <span class="source-line-no">048</span><span id="line-48"> }</span> |
| <span class="source-line-no">049</span><span id="line-49"></span> |
| <span class="source-line-no">050</span><span id="line-50"> public FastPathBalancedQueueRpcExecutor(final String name, final int handlerCount,</span> |
| <span class="source-line-no">051</span><span id="line-51"> final String callQueueType, final int maxQueueLength, final PriorityFunction priority,</span> |
| <span class="source-line-no">052</span><span id="line-52"> final Configuration conf, final Abortable abortable) {</span> |
| <span class="source-line-no">053</span><span id="line-53"> super(name, handlerCount, callQueueType, maxQueueLength, priority, conf, abortable);</span> |
| <span class="source-line-no">054</span><span id="line-54"> }</span> |
| <span class="source-line-no">055</span><span id="line-55"></span> |
| <span class="source-line-no">056</span><span id="line-56"> @Override</span> |
| <span class="source-line-no">057</span><span id="line-57"> protected RpcHandler getHandler(final String name, final double handlerFailureThreshhold,</span> |
| <span class="source-line-no">058</span><span id="line-58"> final int handlerCount, final BlockingQueue<CallRunner> q,</span> |
| <span class="source-line-no">059</span><span id="line-59"> final AtomicInteger activeHandlerCount, final AtomicInteger failedHandlerCount,</span> |
| <span class="source-line-no">060</span><span id="line-60"> final Abortable abortable) {</span> |
| <span class="source-line-no">061</span><span id="line-61"> return new FastPathRpcHandler(name, handlerFailureThreshhold, handlerCount, q,</span> |
| <span class="source-line-no">062</span><span id="line-62"> activeHandlerCount, failedHandlerCount, abortable, fastPathHandlerStack);</span> |
| <span class="source-line-no">063</span><span id="line-63"> }</span> |
| <span class="source-line-no">064</span><span id="line-64"></span> |
| <span class="source-line-no">065</span><span id="line-65"> @Override</span> |
| <span class="source-line-no">066</span><span id="line-66"> public boolean dispatch(CallRunner callTask) {</span> |
| <span class="source-line-no">067</span><span id="line-67"> // FastPathHandlers don't check queue limits, so if we're completely shut down</span> |
| <span class="source-line-no">068</span><span id="line-68"> // we have to prevent ourselves from using the handler in the first place</span> |
| <span class="source-line-no">069</span><span id="line-69"> if (currentQueueLimit == 0) {</span> |
| <span class="source-line-no">070</span><span id="line-70"> return false;</span> |
| <span class="source-line-no">071</span><span id="line-71"> }</span> |
| <span class="source-line-no">072</span><span id="line-72"> FastPathRpcHandler handler = popReadyHandler();</span> |
| <span class="source-line-no">073</span><span id="line-73"> return handler != null ? handler.loadCallRunner(callTask) : super.dispatch(callTask);</span> |
| <span class="source-line-no">074</span><span id="line-74"> }</span> |
| <span class="source-line-no">075</span><span id="line-75"></span> |
| <span class="source-line-no">076</span><span id="line-76"> /** Returns Pop a Handler instance if one available ready-to-go or else return null. */</span> |
| <span class="source-line-no">077</span><span id="line-77"> private FastPathRpcHandler popReadyHandler() {</span> |
| <span class="source-line-no">078</span><span id="line-78"> return this.fastPathHandlerStack.poll();</span> |
| <span class="source-line-no">079</span><span id="line-79"> }</span> |
| <span class="source-line-no">080</span><span id="line-80">}</span> |
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