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Declarative Machine Learning
/*
* 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.matrix.CSVReblockMR;
import org.apache.sysml.runtime.matrix.CSVReblockMR.OffsetCount;
import org.apache.sysml.runtime.transform.TfUtils;
public class CSVAssignRowIDMapper extends MapReduceBase implements Mapper
{
private ByteWritable outKey = new ByteWritable();
private long fileOffset = 0;
private long num = 0;
private boolean first = true;
private OutputCollector outCache = null;
private String delim = " ";
private boolean ignoreFirstLine = false;
private boolean realFirstLine = false;
private String filename = "";
private boolean headerFile = false;
// members relevant to transform
private TfUtils _agents = null;
@Override
public void map(LongWritable key, Text value,
OutputCollector 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 += omit(value.toString()) ? 0 : 1;
}
else
realFirstLine = true;
}
else {
if(realFirstLine) {
report.incrCounter(CSVReblockMR.NUM_COLS_IN_MATRIX, outKey.toString(), value.toString().split(delim, -1).length);
realFirstLine = false;
}
num += omit(value.toString()) ? 0 : 1;
}
}
@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);
FileSystem fs = FileSystem.get(job);
Path thisPath = new Path(job.get(MRConfigurationNames.MR_MAP_INPUT_FILE)).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;
}
// load properties relevant to transform
boolean omit = job.getBoolean(MRJobConfiguration.TF_TRANSFORM, false);
if ( omit )
_agents = new TfUtils(job, true);
}
catch(Exception e) {
throw new RuntimeException(e);
}
}
private boolean omit(String line) {
if(_agents == null)
return false;
return _agents.omit( line.split(delim, -1) );
}
@Override
public void close() throws IOException {
if( outCache != null ) //robustness empty splits
outCache.collect(outKey, new OffsetCount(filename, fileOffset, num));
}
}