org.apache.sysml.runtime.matrix.mapred.CSVAssignRowIDMapper.java Source code

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Here is the source code for org.apache.sysml.runtime.matrix.mapred.CSVAssignRowIDMapper.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.matrix.mapred;

import java.io.IOException;
import java.util.regex.Pattern;

import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.ByteWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.MapReduceBase;
import org.apache.hadoop.mapred.Mapper;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reporter;
import org.apache.sysml.runtime.instructions.mr.CSVReblockInstruction;
import org.apache.sysml.runtime.io.IOUtilFunctions;
import org.apache.sysml.runtime.matrix.CSVReblockMR;
import org.apache.sysml.runtime.matrix.CSVReblockMR.OffsetCount;

public class CSVAssignRowIDMapper extends MapReduceBase
        implements Mapper<LongWritable, Text, ByteWritable, OffsetCount> {
    private ByteWritable outKey = new ByteWritable();
    private long fileOffset = 0;
    private long num = 0;
    private boolean first = true;
    private OutputCollector<ByteWritable, OffsetCount> outCache = null;
    private String delim = " ";
    private boolean ignoreFirstLine = false;
    private boolean realFirstLine = false;
    private String filename = "";
    private boolean headerFile = false;

    @Override
    public void map(LongWritable key, Text value, OutputCollector<ByteWritable, OffsetCount> out, Reporter report)
            throws IOException {
        if (first) {
            first = false;
            fileOffset = key.get();
            outCache = out;
        }

        //getting the number of colums
        if (key.get() == 0 && headerFile) {
            if (!ignoreFirstLine) {
                report.incrCounter(CSVReblockMR.NUM_COLS_IN_MATRIX, outKey.toString(),
                        value.toString().split(delim, -1).length);
                num++;
            } else
                realFirstLine = true;
        } else {
            if (realFirstLine) {
                report.incrCounter(CSVReblockMR.NUM_COLS_IN_MATRIX, outKey.toString(),
                        value.toString().split(delim, -1).length);
                realFirstLine = false;
            }
            num++;
        }
    }

    @Override
    @SuppressWarnings("deprecation")
    public void configure(JobConf job) {
        byte thisIndex;
        try {
            //it doesn't make sense to have repeated file names in the input, since this is for reblock
            thisIndex = MRJobConfiguration.getInputMatrixIndexesInMapper(job).get(0);
            outKey.set(thisIndex);
            Path thisPath = new Path(job.get(MRConfigurationNames.MR_MAP_INPUT_FILE));
            FileSystem fs = IOUtilFunctions.getFileSystem(thisPath, job);
            thisPath = thisPath.makeQualified(fs);
            filename = thisPath.toString();
            String[] strs = job.getStrings(CSVReblockMR.SMALLEST_FILE_NAME_PER_INPUT);
            Path headerPath = new Path(strs[thisIndex]).makeQualified(fs);
            headerFile = headerPath.toString().equals(filename);

            CSVReblockInstruction[] reblockInstructions = MRJobConfiguration.getCSVReblockInstructions(job);
            for (CSVReblockInstruction ins : reblockInstructions)
                if (ins.input == thisIndex) {
                    delim = Pattern.quote(ins.delim);
                    ignoreFirstLine = ins.hasHeader;
                    break;
                }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public void close() throws IOException {
        if (outCache != null) //robustness empty splits
            outCache.collect(outKey, new OffsetCount(filename, fileOffset, num));
    }
}