/*
* 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;
import com.mongodb.hadoop.input.BSONFileRecordReader;
import com.mongodb.hadoop.splitter.BSONSplitter;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.PathFilter;
import org.apache.hadoop.mapreduce.InputSplit;
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.mapreduce.lib.input.FileSplit;
import org.apache.hadoop.util.ReflectionUtils;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class BSONFileInputFormat extends FileInputFormat {
private static final Log LOG = LogFactory.getLog(BSONFileInputFormat.class);
@Override
public RecordReader createRecordReader(final InputSplit split, final TaskAttemptContext context)
throws IOException, InterruptedException {
BSONFileRecordReader reader = new BSONFileRecordReader();
reader.initialize(split, context);
return reader;
}
public static PathFilter getInputPathFilter(final JobContext context) {
Configuration conf = context.getConfiguration();
Class<?> filterClass = conf.getClass("bson.pathfilter.class", null, PathFilter.class);
return filterClass != null ? (PathFilter) ReflectionUtils.newInstance(filterClass, conf) : null;
}
@Override
public List<FileSplit> getSplits(final JobContext context) throws IOException {
Configuration config = context.getConfiguration();
PathFilter pf = getInputPathFilter(context);
ArrayList<FileSplit> splits = new ArrayList<FileSplit>();
List<FileStatus> inputFiles = listStatus(context);
for (FileStatus file : inputFiles) {
if (pf != null && !pf.accept(file.getPath())) {
if (LOG.isDebugEnabled()) {
LOG.debug(String.format("skipping file %s not matched path filter.", file.getPath()));
}
continue;
} else {
if (LOG.isDebugEnabled()) {
LOG.debug("processing file " + file.getPath());
}
}
BSONSplitter splitter = new BSONSplitter();
splitter.setConf(config);
splitter.setInputPath(file.getPath());
Path splitFilePath = new Path(file.getPath().getParent(), "." + file.getPath().getName() + ".splits");
try {
splitter.loadSplitsFromSplitFile(file, splitFilePath);
} catch (BSONSplitter.NoSplitFileException nsfe) {
if (LOG.isDebugEnabled()) {
LOG.debug(String.format("No split file for %s; building split file", file.getPath()));
}
splitter.readSplitsForFile(file);
}
if (LOG.isDebugEnabled()) {
LOG.debug(String.format("BSONSplitter found %d splits.", splitter.getAllSplits().size()));
}
splits.addAll(splitter.getAllSplits());
}
if (LOG.isDebugEnabled()) {
LOG.debug(String.format("Total of %d found.", splits.size()));
}
return splits;
}
}