hadoop ShuffleScheduler 源码
haddop ShuffleScheduler 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/task/reduce/ShuffleScheduler.java
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.mapreduce.task.reduce;
import java.io.IOException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.mapred.TaskCompletionEvent;
@InterfaceAudience.Private
@InterfaceStability.Unstable
public interface ShuffleScheduler<K,V> {
/**
* Wait until the shuffle finishes or until the timeout.
* @param millis maximum wait time
* @return true if the shuffle is done
* @throws InterruptedException
*/
public boolean waitUntilDone(int millis) throws InterruptedException;
/**
* Interpret a {@link TaskCompletionEvent} from the event stream.
* @param tce Intermediate output metadata
*/
public void resolve(TaskCompletionEvent tce)
throws IOException, InterruptedException;
public void close() throws InterruptedException;
}
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