/**
* Copyright 2011 LiveRamp
*
* Licensed 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 com.liveramp.hank.hadoop;
import java.io.IOException;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapred.FileOutputFormat;
import org.apache.hadoop.mapred.JobClient;
import org.apache.hadoop.mapred.JobConf;
import com.liveramp.hank.coordinator.DomainVersionProperties;
public abstract class AbstractHadoopDomainBuilder {
private final JobConf baseConf;
public AbstractHadoopDomainBuilder() {
this.baseConf = null;
}
public AbstractHadoopDomainBuilder(JobConf baseConf) {
this.baseConf = baseConf;
}
public void buildHankDomain(DomainBuilderProperties properties,
DomainVersionProperties newDomainVersionProperties) throws IOException {
// Open new version and check for success
DomainVersionNumberAndNumPartitions domainVersionNumberAndNumPartitions = properties.openVersion(newDomainVersionProperties);
Integer domainVersionNumber = domainVersionNumberAndNumPartitions.getDomainVersionNumber();
Integer numPartitions = domainVersionNumberAndNumPartitions.getNumPartitions();
// Try to build new version
JobConf conf;
if (baseConf == null) {
conf = new JobConf();
} else {
conf = new JobConf(baseConf);
}
configureJobCommon(properties, domainVersionNumber, numPartitions, conf);
configureJob(conf);
try {
// Set up job
DomainBuilderOutputCommitter.setupJob(properties.getDomainName(), conf);
// Run job
JobClient.runJob(conf);
// Commit job
DomainBuilderOutputCommitter.commitJob(properties.getDomainName(), conf);
} catch (Exception e) {
// In case of failure, cancel this new version
properties.cancelVersion(domainVersionNumber);
// Clean up job
DomainBuilderOutputCommitter.cleanupJob(properties.getDomainName(), conf);
throw new IOException("Failed at building version " + domainVersionNumber
+ " of domain " + properties.getDomainName() + ". Cancelling version.", e);
}
// Close the new version
properties.closeVersion(domainVersionNumber);
// Clean up job
DomainBuilderOutputCommitter.cleanupJob(properties.getDomainName(), conf);
}
private void configureJobCommon(DomainBuilderProperties properties, int versionNumber, int numPartitions, JobConf conf) throws IOException {
// Hank specific configuration
properties.setJobConfProperties(conf, versionNumber);
// Output Committer
conf.setOutputCommitter(DomainBuilderOutputCommitter.class);
// Output path (set to tmp output path)
FileOutputFormat.setOutputPath(conf, new Path(properties.getTmpOutputPath(versionNumber)));
// Output format
conf.setOutputFormat(properties.getOutputFormatClass());
// Num reduce tasks
conf.setNumReduceTasks(numPartitions);
}
protected abstract void configureJob(JobConf conf);
}