/**
* 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.hive.ql.io;
import java.io.IOException;
import java.util.Properties;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.ql.exec.Utilities;
import org.apache.hadoop.hive.ql.exec.FileSinkOperator.RecordWriter;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.SequenceFile;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.SequenceFileOutputFormat;
import org.apache.hadoop.util.Progressable;
/** A {@link HiveOutputFormat} that writes {@link SequenceFile}s. */
public class HiveSequenceFileOutputFormat extends
SequenceFileOutputFormat implements
HiveOutputFormat<WritableComparable, Writable> {
BytesWritable EMPTY_KEY = new BytesWritable();
/**
* create the final out file, and output an empty key as the key
*
* @param jc
* the job configuration file
* @param finalOutPath
* the final output file to be created
* @param valueClass
* the value class used for create
* @param isCompressed
* whether the content is compressed or not
* @param tableProperties
* the tableInfo of this file's corresponding table
* @param progress
* progress used for status report
* @return the RecordWriter for the output file
*/
@Override
public RecordWriter getHiveRecordWriter(JobConf jc, Path finalOutPath,
Class<? extends Writable> valueClass, boolean isCompressed,
Properties tableProperties, Progressable progress) throws IOException {
FileSystem fs = finalOutPath.getFileSystem(jc);
final SequenceFile.Writer outStream = Utilities.createSequenceWriter(jc,
fs, finalOutPath, BytesWritable.class, valueClass,
isCompressed);
return new RecordWriter() {
public void write(Writable r) throws IOException {
outStream.append(EMPTY_KEY, r);
}
public void close(boolean abort) throws IOException {
outStream.close();
}
};
}
}