/**
* 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.crunch.impl.mr.run;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import org.apache.crunch.io.CrunchInputs;
import org.apache.crunch.io.FormatBundle;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapreduce.InputFormat;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.JobContext;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.util.ReflectionUtils;
import com.google.common.collect.Lists;
public class CrunchInputFormat<K, V> extends InputFormat<K, V> {
@Override
public List<InputSplit> getSplits(JobContext job) throws IOException, InterruptedException {
List<InputSplit> splits = Lists.newArrayList();
Configuration base = job.getConfiguration();
Map<FormatBundle, Map<Integer, List<Path>>> formatNodeMap = CrunchInputs.getFormatNodeMap(job);
// First, build a map of InputFormats to Paths
for (Map.Entry<FormatBundle, Map<Integer, List<Path>>> entry : formatNodeMap.entrySet()) {
FormatBundle inputBundle = entry.getKey();
Configuration conf = new Configuration(base);
inputBundle.configure(conf);
Job jobCopy = new Job(conf);
InputFormat<?, ?> format = (InputFormat<?, ?>) ReflectionUtils.newInstance(inputBundle.getFormatClass(),
jobCopy.getConfiguration());
for (Map.Entry<Integer, List<Path>> nodeEntry : entry.getValue().entrySet()) {
Integer nodeIndex = nodeEntry.getKey();
List<Path> paths = nodeEntry.getValue();
FileInputFormat.setInputPaths(jobCopy, paths.toArray(new Path[paths.size()]));
// Get splits for each input path and tag with InputFormat
// and Mapper types by wrapping in a TaggedInputSplit.
List<InputSplit> pathSplits = format.getSplits(jobCopy);
for (InputSplit pathSplit : pathSplits) {
splits.add(new CrunchInputSplit(pathSplit, inputBundle, nodeIndex, conf));
}
}
}
return splits;
}
@Override
public RecordReader<K, V> createRecordReader(InputSplit inputSplit, TaskAttemptContext context) throws IOException,
InterruptedException {
return new CrunchRecordReader<K, V>(inputSplit, context);
}
}