hadoop SetupTaskStage 源码
haddop SetupTaskStage 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/lib/output/committer/manifest/stages/SetupTaskStage.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.lib.output.committer.manifest.stages;
import java.io.IOException;
import org.apache.hadoop.fs.Path;
import static java.util.Objects.requireNonNull;
import static org.apache.hadoop.mapreduce.lib.output.committer.manifest.ManifestCommitterStatisticNames.OP_STAGE_TASK_SETUP;
/**
* Stage to set up task.
* This creates the task attempt directory, after verifying
* that the job attempt dir exists (i.e. this is invoked
* after the job is started and before any cleanup.
* Argument passed in is task name:only for logging.
*/
public class SetupTaskStage extends
AbstractJobOrTaskStage<String, Path> {
public SetupTaskStage(final StageConfig stageConfig) {
super(true, stageConfig, OP_STAGE_TASK_SETUP, false);
}
/**
* Set up a task.
* @param name task name (for logging)
* @return task attempt directory
* @throws IOException IO failure.
*/
@Override
protected Path executeStage(final String name) throws IOException {
return createNewDirectory("Task setup " + name,
requireNonNull(getTaskAttemptDir(), "No task attempt directory"));
}
}
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