/**
* 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.FileSinkOperator.RecordWriter;
import org.apache.hadoop.hive.ql.exec.Utilities;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.SequenceFile;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;
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 with the
* content saved in the keys, and null in the values.
*/
public class HiveNullValueSequenceFileOutputFormat<K,V>
extends SequenceFileOutputFormat<K,V>
implements HiveOutputFormat<K,V> {
private static final Writable NULL_WRITABLE = NullWritable.get();
private HiveKey keyWritable;
private boolean keyIsText;
@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, HiveKey.class, NullWritable.class, isCompressed);
keyWritable = new HiveKey();
keyIsText = valueClass.equals(Text.class);
return new RecordWriter() {
@Override
public void write(Writable r) throws IOException {
if (keyIsText) {
Text text = (Text) r;
keyWritable.set(text.getBytes(), 0, text.getLength());
} else {
BytesWritable bw = (BytesWritable) r;
// Once we drop support for old Hadoop versions, change these
// to getBytes() and getLength() to fix the deprecation warnings.
// Not worth a shim.
keyWritable.set(bw.get(), 0, bw.getSize());
}
keyWritable.setHashCode(r.hashCode());
outStream.append(keyWritable, NULL_WRITABLE);
}
@Override
public void close(boolean abort) throws IOException {
outStream.close();
}
};
}
}