/*
* Copyright 2010-2013 10gen Inc.
*
* Licensed 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 com.mongodb.hadoop.mapred;
import com.mongodb.hadoop.input.MongoInputSplit;
import com.mongodb.hadoop.io.BSONWritable;
import com.mongodb.hadoop.mapred.input.MongoRecordReader;
import com.mongodb.hadoop.splitter.MongoSplitter;
import com.mongodb.hadoop.splitter.MongoSplitterFactory;
import com.mongodb.hadoop.splitter.SplitFailedException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.mapred.InputFormat;
import org.apache.hadoop.mapred.InputSplit;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.RecordReader;
import org.apache.hadoop.mapred.Reporter;
import java.io.IOException;
import java.util.List;
public class MongoInputFormat implements InputFormat<BSONWritable, BSONWritable> {
private static final Log LOG = LogFactory.getLog(MongoInputFormat.class);
@SuppressWarnings("deprecation")
public RecordReader<BSONWritable, BSONWritable> getRecordReader(final InputSplit split, final JobConf job,
final Reporter reporter) {
if (!(split instanceof MongoInputSplit)) {
throw new IllegalStateException("Creation of a new RecordReader requires a MongoInputSplit instance.");
}
final MongoInputSplit mis = (MongoInputSplit) split;
return new MongoRecordReader(mis);
}
public InputSplit[] getSplits(final JobConf job, final int numSplits) throws IOException {
try {
MongoSplitter splitterImpl = MongoSplitterFactory.getSplitter(job);
LOG.info("Using " + splitterImpl + " to calculate splits. (old mapreduce API)");
final List<org.apache.hadoop.mapreduce.InputSplit> splits = splitterImpl.calculateSplits();
return splits.toArray(new InputSplit[splits.size()]);
} catch (SplitFailedException spfe) {
throw new IOException(spfe);
}
}
public boolean verifyConfiguration(final Configuration conf) {
return true;
}
}