hadoop NullTaskRuntimesEngine 源码
haddop NullTaskRuntimesEngine 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/speculate/NullTaskRuntimesEngine.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.v2.app.speculate;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.mapreduce.v2.api.records.TaskAttemptId;
import org.apache.hadoop.mapreduce.v2.api.records.TaskId;
import org.apache.hadoop.mapreduce.v2.app.AppContext;
import org.apache.hadoop.mapreduce.v2.app.job.event.TaskAttemptStatusUpdateEvent.TaskAttemptStatus;
/*
* This class is provided solely as an exemplae of the values that mean
* that nothing needs to be computed. It's not currently used.
*/
public class NullTaskRuntimesEngine implements TaskRuntimeEstimator {
@Override
public void enrollAttempt(TaskAttemptStatus status, long timestamp) {
// no code
}
@Override
public long attemptEnrolledTime(TaskAttemptId attemptID) {
return Long.MAX_VALUE;
}
@Override
public void updateAttempt(TaskAttemptStatus status, long timestamp) {
// no code
}
@Override
public void contextualize(Configuration conf, AppContext context) {
// no code
}
@Override
public long thresholdRuntime(TaskId id) {
return Long.MAX_VALUE;
}
@Override
public long estimatedRuntime(TaskAttemptId id) {
return -1L;
}
@Override
public long estimatedNewAttemptRuntime(TaskId id) {
return -1L;
}
@Override
public long runtimeEstimateVariance(TaskAttemptId id) {
return -1L;
}
}
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