org.apache.hadoop.hive.ql.io.HiveOutputFormatImpl Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
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*
* http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.hadoop.hive.ql.io;
import java.io.IOException;
import java.util.List;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.hive.ql.exec.FileSinkOperator;
import org.apache.hadoop.hive.ql.exec.Operator;
import org.apache.hadoop.hive.ql.exec.Utilities;
import org.apache.hadoop.hive.ql.plan.MapredWork;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.OutputFormat;
import org.apache.hadoop.mapred.RecordWriter;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.util.Progressable;
/**
* Hive does not use OutputFormat's in a conventional way, but constructs and uses
* the defined OutputFormat for each table from FileSinkOperator. HiveOutputFormatImpl is
* used for basic setup, especially for calling checkOutputSpecs().
*/
public class HiveOutputFormatImpl, V extends Writable>
implements OutputFormat {
//no records will be emited from Hive
@Override
public RecordWriter getRecordWriter(FileSystem ignored, JobConf job, String name,
Progressable progress) {
return new RecordWriter() {
public void write(K key, V value) {
throw new RuntimeException("Should not be called");
}
public void close(Reporter reporter) {
}
};
}
@Override
public void checkOutputSpecs(FileSystem ignored, JobConf job) throws IOException {
MapredWork work = Utilities.getMapRedWork(job);
List> opList = work.getAllOperators();
for (Operator op : opList) {
if (op instanceof FileSinkOperator) {
((FileSinkOperator) op).checkOutputSpecs(ignored, job);
}
}
}
}