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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.io;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.Iterator;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapred.JobConf;
import org.apache.sysml.conf.ConfigurationManager;
import org.apache.sysml.runtime.DMLRuntimeException;
import org.apache.sysml.runtime.matrix.data.IJV;
import org.apache.sysml.runtime.matrix.data.MatrixBlock;
import org.apache.sysml.runtime.util.MapReduceTool;
public class WriterTextCell extends MatrixWriter
{
@Override
public final void writeMatrixToHDFS(MatrixBlock src, String fname, long rlen, long clen, int brlen, int bclen, long nnz)
throws IOException, DMLRuntimeException
{
//validity check matrix dimensions
if( src.getNumRows() != rlen || src.getNumColumns() != clen ) {
throw new IOException("Matrix dimensions mismatch with metadata: "+src.getNumRows()+"x"+src.getNumColumns()+" vs "+rlen+"x"+clen+".");
}
//prepare file access
JobConf job = new JobConf(ConfigurationManager.getCachedJobConf());
FileSystem fs = FileSystem.get(job);
Path path = new Path( fname );
//if the file already exists on HDFS, remove it.
MapReduceTool.deleteFileIfExistOnHDFS( fname );
//core write
writeTextCellMatrixToHDFS(path, job, fs, src, rlen, clen);
IOUtilFunctions.deleteCrcFilesFromLocalFileSystem(fs, path);
}
@Override
public final void writeEmptyMatrixToHDFS(String fname, long rlen, long clen, int brlen, int bclen)
throws IOException, DMLRuntimeException
{
Path path = new Path( fname );
FileSystem fs = FileSystem.get(ConfigurationManager.getCachedJobConf());
FSDataOutputStream writer = fs.create(path);
writer.writeBytes("1 1 0");
writer.close();
IOUtilFunctions.deleteCrcFilesFromLocalFileSystem(fs, path);
}
protected void writeTextCellMatrixToHDFS( Path path, JobConf job, FileSystem fs, MatrixBlock src, long rlen, long clen )
throws IOException
{
//sequential write text cell file
writeTextCellMatrixToFile(path, job, fs, src, 0, (int)rlen);
}
protected final void writeTextCellMatrixToFile( Path path, JobConf job, FileSystem fs, MatrixBlock src, int rl, int ru )
throws IOException
{
boolean sparse = src.isInSparseFormat();
int clen = src.getNumColumns();
BufferedWriter br = new BufferedWriter(new OutputStreamWriter(fs.create(path,true)));
try
{
//for obj reuse and preventing repeated buffer re-allocations
StringBuilder sb = new StringBuilder();
if( sparse ) //SPARSE
{
Iterator iter = src.getSparseBlockIterator(rl, ru);
while( iter.hasNext() )
{
IJV cell = iter.next();
sb.append(cell.getI()+1);
sb.append(' ');
sb.append(cell.getJ()+1);
sb.append(' ');
sb.append(cell.getV());
sb.append('\n');
br.write( sb.toString() ); //same as append
sb.setLength(0);
}
}
else //DENSE
{
for( int i=rl; i