hadoop SaveSuccessFileStage 源码
haddop SaveSuccessFileStage 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/SaveSuccessFileStage.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 org.apache.hadoop.mapreduce.lib.output.committer.manifest.files.ManifestSuccessData;
import static org.apache.hadoop.mapreduce.lib.output.committer.manifest.ManifestCommitterConstants.SUCCESS_MARKER;
import static org.apache.hadoop.mapreduce.lib.output.committer.manifest.ManifestCommitterConstants.TMP_SUFFIX;
import static org.apache.hadoop.mapreduce.lib.output.committer.manifest.ManifestCommitterStatisticNames.OP_STAGE_JOB_COMMIT;
import static org.apache.hadoop.mapreduce.lib.output.committer.manifest.ManifestCommitterStatisticNames.OP_STAGE_JOB_SAVE_SUCCESS;
/**
* Save the _SUCCESS file to the destination directory
* via a temp file in the job attempt dir.
* Returns the path of the file
*/
public class SaveSuccessFileStage extends
AbstractJobOrTaskStage<ManifestSuccessData, Path> {
private static final Logger LOG = LoggerFactory.getLogger(
SaveSuccessFileStage.class);
public SaveSuccessFileStage(final StageConfig stageConfig) {
super(false, stageConfig, OP_STAGE_JOB_SAVE_SUCCESS, false);
}
/**
* Stage name is always job commit.
* @param arguments args to the invocation.
* @return stage name
*/
@Override
protected String getStageName(ManifestSuccessData arguments) {
// set it to the job commit stage, always.
return OP_STAGE_JOB_COMMIT;
}
/**
* Execute.
* @param successData success data to save
* @return path saved to.
* @throws IOException failure
*/
@Override
protected Path executeStage(final ManifestSuccessData successData)
throws IOException {
// Save the marker
Path successFile = getStageConfig().getJobSuccessMarkerPath();
Path successTempFile = new Path(getJobAttemptDir(), SUCCESS_MARKER + TMP_SUFFIX);
LOG.debug("{}: Saving _SUCCESS file to {} via {}", successFile,
getName(),
successTempFile);
save(successData, successTempFile, successFile);
return successFile;
}
}
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