/**
* 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.tez.mapreduce.lib;
import java.io.IOException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
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.JobContext;
import org.apache.hadoop.mapred.RecordReader;
import org.apache.tez.common.counters.TezCounter;
import org.apache.tez.common.counters.TezCounters;
import org.apache.tez.mapreduce.hadoop.mapred.MRReporter;
import org.apache.tez.mapreduce.input.MRInput;
import com.google.common.base.Preconditions;
public class MRReaderMapred extends MRReader {
private static final Log LOG = LogFactory.getLog(MRReaderMapred.class);
Object key;
Object value;
private final JobConf jobConf;
private final TezCounters tezCounters;
private final TezCounter inputRecordCounter;
@SuppressWarnings("rawtypes")
private final InputFormat inputFormat;
protected InputSplit inputSplit;
@SuppressWarnings("rawtypes")
protected RecordReader recordReader;
private Configuration incrementalConf;
private boolean setupComplete = false;
public MRReaderMapred(JobConf jobConf, TezCounters tezCounters, TezCounter inputRecordCounter)
throws IOException {
this(jobConf, null, tezCounters, inputRecordCounter);
}
public MRReaderMapred(JobConf jobConf, InputSplit inputSplit, TezCounters tezCounters,
TezCounter inputRecordCounter) throws IOException {
this.jobConf = jobConf;
this.tezCounters = tezCounters;
this.inputRecordCounter = inputRecordCounter;
inputFormat = this.jobConf.getInputFormat();
if (inputSplit != null) {
this.inputSplit = inputSplit;
setupOldRecordReader();
}
}
@Override
public void setSplit(Object inputSplit) throws IOException {
this.inputSplit = (InputSplit) inputSplit;
setupOldRecordReader();
}
@Override
public boolean isSetup() {
return setupComplete;
}
@Override
public float getProgress() throws IOException, InterruptedException {
return setupComplete ? recordReader.getProgress() : 0.0f;
}
@Override
public void close() throws IOException {
if (setupComplete) {
recordReader.close();
}
}
@Override
public Object getSplit() {
return inputSplit;
}
@Override
public Object getRecordReader() {
return recordReader;
}
@SuppressWarnings("unchecked")
@Override
public boolean next() throws IOException {
boolean hasNext = recordReader.next(key, value);
if (hasNext) {
inputRecordCounter.increment(1);
}
return hasNext;
}
@Override
public Object getCurrentKey() throws IOException {
return key;
}
@Override
public Object getCurrentValue() throws IOException {
return value;
}
/**
* {@link MRInput} sets some additional parameters like split location when using the new API.
* This methods returns the list of additional updates, and should be used by Processors using the
* old MapReduce API with {@link MRInput}.
*
* @return the additional fields set by {@link MRInput}
*/
public Configuration getConfigUpdates() {
if (incrementalConf != null) {
return new Configuration(incrementalConf);
}
return null;
}
private void setupOldRecordReader() throws IOException {
Preconditions.checkNotNull(inputSplit, "Input split hasn't yet been setup");
recordReader = inputFormat.getRecordReader(inputSplit, this.jobConf, new MRReporter(
tezCounters, inputSplit));
setIncrementalConfigParams(inputSplit);
key = recordReader.createKey();
value = recordReader.createValue();
setupComplete = true;
}
private void setIncrementalConfigParams(InputSplit inputSplit) {
if (inputSplit instanceof FileSplit) {
FileSplit fileSplit = (FileSplit) inputSplit;
this.incrementalConf = new Configuration(false);
this.incrementalConf.set(JobContext.MAP_INPUT_FILE, fileSplit.getPath().toString());
this.incrementalConf.setLong(JobContext.MAP_INPUT_START, fileSplit.getStart());
this.incrementalConf.setLong(JobContext.MAP_INPUT_PATH, fileSplit.getLength());
}
LOG.info("Processing split: " + inputSplit);
}
}