org.apache.sysml.runtime.controlprogram.parfor.RemoteParForColocatedNLineInputFormat.java Source code

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Here is the source code for org.apache.sysml.runtime.controlprogram.parfor.RemoteParForColocatedNLineInputFormat.java

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/*
 * 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.sysml.runtime.controlprogram.parfor;

import java.io.IOException;

import org.apache.hadoop.mapred.FileSplit;
import org.apache.hadoop.mapred.InputSplit;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.lib.NLineInputFormat;

import org.apache.sysml.runtime.controlprogram.ParForProgramBlock.PDataPartitionFormat;
import org.apache.sysml.runtime.controlprogram.ParForProgramBlock.PartitionFormat;
import org.apache.sysml.runtime.matrix.MatrixCharacteristics;
import org.apache.sysml.runtime.matrix.mapred.MRJobConfiguration;

/**
 * Specific extension of NLineInputFormat in order to ensure data colocation
 * for partitioned matrices although those matrices are not directly passed to the
 * MR job as an input.
 * 
 */
public class RemoteParForColocatedNLineInputFormat extends NLineInputFormat {
    @Override
    public InputSplit[] getSplits(JobConf job, int numSplits) throws IOException {
        InputSplit[] tmp = super.getSplits(job, numSplits);

        //get partitioning information
        MatrixCharacteristics mc = MRJobConfiguration.getPartitionedMatrixSize(job);
        PDataPartitionFormat dpf = MRJobConfiguration.getPartitioningFormat(job);
        PartitionFormat pf = new PartitionFormat(dpf, -1);
        int blen = (int) (pf.isRowwise() ? pf.getNumRows(mc) : pf.getNumColumns(mc));
        String fname = MRJobConfiguration.getPartitioningFilename(job);

        //create wrapper splits 
        InputSplit[] ret = new InputSplit[tmp.length];
        for (int i = 0; i < tmp.length; i++) {
            //check for robustness of subsequent cast
            if (tmp[i] instanceof FileSplit)
                ret[i] = new RemoteParForColocatedFileSplit((FileSplit) tmp[i], fname, blen);
            else
                ret[i] = tmp[i];
        }
        return ret;
    }
}