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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.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.LocalFileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapred.JobConf;
import org.apache.sysml.conf.DMLConfig;
import org.apache.sysml.hops.OptimizerUtils;
import org.apache.sysml.runtime.DMLRuntimeException;
import org.apache.sysml.runtime.controlprogram.parfor.stat.InfrastructureAnalyzer;
import org.apache.sysml.runtime.matrix.data.MatrixBlock;
import org.apache.sysml.runtime.util.MapReduceTool;
public class WriterBinaryBlockParallel extends WriterBinaryBlock
{
public WriterBinaryBlockParallel( int replication ) {
super(replication);
}
@Override
protected void writeBinaryBlockMatrixToHDFS( Path path, JobConf job, FileSystem fs, MatrixBlock src, long rlen, long clen, int brlen, int bclen )
throws IOException, DMLRuntimeException
{
//estimate output size and number of output blocks (min 1)
int numPartFiles = (int)(OptimizerUtils.estimatePartitionedSizeExactSparsity(rlen, clen,
brlen, bclen, src.getNonZeros()) / InfrastructureAnalyzer.getHDFSBlockSize());
numPartFiles = Math.max(numPartFiles, 1);
//determine degree of parallelism
int numThreads = OptimizerUtils.getParallelBinaryWriteParallelism();
numThreads = Math.min(numThreads, numPartFiles);
//fall back to sequential write if dop is 1 (e.g., <128MB) in order to create single file
if( numThreads <= 1 ) {
super.writeBinaryBlockMatrixToHDFS(path, job, fs, src, rlen, clen, brlen, bclen);
return;
}
//create directory for concurrent tasks
MapReduceTool.createDirIfNotExistOnHDFS(path.toString(), DMLConfig.DEFAULT_SHARED_DIR_PERMISSION);
//create and execute write tasks
try
{
ExecutorService pool = Executors.newFixedThreadPool(numThreads);
ArrayList tasks = new ArrayList();
int blklen = (int)Math.ceil((double)rlen / brlen / numThreads) * brlen;
for(int i=0; i> rt = pool.invokeAll(tasks);
pool.shutdown();
//check for exceptions
for( Future