hadoop SetupJobStage 源码
haddop SetupJobStage 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/SetupJobStage.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.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.fs.Path;
import static org.apache.hadoop.mapreduce.lib.output.committer.manifest.ManifestCommitterStatisticNames.OP_STAGE_JOB_SETUP;
/**
* Stage to set up a job by creating the job attempt directory.
* The job attempt directory must not exist before the call.
*/
public class SetupJobStage extends
AbstractJobOrTaskStage<Boolean, Path> {
private static final Logger LOG = LoggerFactory.getLogger(
SetupJobStage.class);
public SetupJobStage(final StageConfig stageConfig) {
super(false, stageConfig, OP_STAGE_JOB_SETUP, false);
}
/**
* Execute the job setup stage.
* @param deleteMarker: should any success marker be deleted.
* @return the job attempted directory.
* @throws IOException failure.
*/
@Override
protected Path executeStage(final Boolean deleteMarker) throws IOException {
final Path path = getJobAttemptDir();
LOG.info("{}: Creating Job Attempt directory {}", getName(), path);
createNewDirectory("Job setup", path);
createNewDirectory("Creating task manifest dir", getTaskManifestDir());
// delete any success marker if so instructed.
if (deleteMarker) {
delete(getStageConfig().getJobSuccessMarkerPath(), false);
}
return path;
}
}
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