com.blackberry.logdriver.mapred.boom.BoomInputFormat.java Source code

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Here is the source code for com.blackberry.logdriver.mapred.boom.BoomInputFormat.java

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/** Copyright (c) 2014 BlackBerry Limited
 *
 *  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.blackberry.logdriver.mapred.boom;

import java.io.IOException;

import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.io.Text;
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 org.apache.hadoop.mapred.lib.CombineFileInputFormat;
import org.apache.hadoop.mapred.lib.CombineFileSplit;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.blackberry.logdriver.boom.LogLineData;

public class BoomInputFormat extends CombineFileInputFormat<LogLineData, Text> {
    private static final Logger LOG = LoggerFactory.getLogger(BoomInputFormat.class);

    private static final long MAX_SPLIT_LOCATIONS = 100000;

    @SuppressWarnings("deprecation")
    @Override
    public InputSplit[] getSplits(JobConf job, int numSplits) throws IOException {
        // Ensure we have sensible defaults for how we build blocks.
        if (job.get("mapreduce.job.max.split.locations") == null) {
            job.setLong("mapreduce.job.max.split.locations", MAX_SPLIT_LOCATIONS);
        }
        if (job.get("mapred.max.split.size") == null) {
            // Try to set the split size to the default block size. In case of
            // failure, we'll use this 128MB default.
            long blockSize = 128 * 1024 * 1024; // 128MB
            try {
                blockSize = FileSystem.get(job).getDefaultBlockSize();
            } catch (IOException e) {
                LOG.error("Error getting filesystem to get get default block size (this does not bode well).");
            }
            job.setLong("mapred.max.split.size", blockSize);
        }

        return super.getSplits(job, numSplits);
    }

    @Override
    public RecordReader<LogLineData, Text> getRecordReader(InputSplit split, JobConf job, Reporter reporter)
            throws IOException {
        return new BoomRecordReader((CombineFileSplit) split, job);
    }

}