/**
* 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 org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.ql.exec.ExecMapper;
import org.apache.hadoop.hive.ql.io.CombineHiveInputFormat.CombineHiveInputSplit;
import org.apache.hadoop.hive.shims.HadoopShims.InputSplitShim;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.mapred.FileSplit;
import org.apache.hadoop.mapred.InputFormat;
import org.apache.hadoop.mapred.InputSplit;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.Reporter;
/**
* CombineHiveRecordReader.
*
* @param <K>
* @param <V>
*/
public class CombineHiveRecordReader<K extends WritableComparable, V extends Writable>
extends HiveContextAwareRecordReader<K, V> {
public CombineHiveRecordReader(InputSplit split, Configuration conf,
Reporter reporter, Integer partition) throws IOException {
super((JobConf)conf);
CombineHiveInputSplit hsplit = new CombineHiveInputSplit(jobConf,
(InputSplitShim) split);
String inputFormatClassName = hsplit.inputFormatClassName();
Class inputFormatClass = null;
try {
inputFormatClass = Class.forName(inputFormatClassName);
} catch (ClassNotFoundException e) {
throw new IOException("CombineHiveRecordReader: class not found "
+ inputFormatClassName);
}
InputFormat inputFormat = HiveInputFormat.getInputFormatFromCache(
inputFormatClass, jobConf);
// create a split for the given partition
FileSplit fsplit = new FileSplit(hsplit.getPaths()[partition], hsplit
.getStartOffsets()[partition], hsplit.getLengths()[partition], hsplit
.getLocations());
this.setRecordReader(inputFormat.getRecordReader(fsplit, jobConf, reporter));
this.initIOContext(fsplit, jobConf, inputFormatClass, this.recordReader);
}
@Override
public void doClose() throws IOException {
recordReader.close();
}
public K createKey() {
return (K) recordReader.createKey();
}
public V createValue() {
return (V) recordReader.createValue();
}
public long getPos() throws IOException {
return recordReader.getPos();
}
@Override
public float getProgress() throws IOException {
if (isSorted) {
return super.getProgress();
}
return recordReader.getProgress();
}
@Override
public boolean doNext(K key, V value) throws IOException {
if (ExecMapper.getDone()) {
return false;
}
return super.doNext(key, value);
}
}