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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 org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.mapred.JobConf;
import org.apache.sysml.runtime.matrix.data.MatrixIndexes;
import org.apache.sysml.runtime.matrix.data.MatrixValue;
import org.apache.sysml.runtime.matrix.data.Pair;
public class MMCJMRInputCache extends MMCJMRCache
{
//in-memory buffer
private int cacheSize = 0;
private boolean flushedAll = false;
private boolean memOnly;
public MMCJMRInputCache( JobConf conf, long memSize, long rlen, long clen, int brlen, int bclen, boolean leftCached, Class valueClass )
throws IOException, IllegalAccessException, InstantiationException
{
long elementSize = 77+8*Math.min(rlen,brlen)*Math.min(clen,bclen)+20+12+12+4;//matrix block, matrix index, pair, integer in the linked list
long numRowBlocks = leftCached ? (long)Math.ceil((double)rlen/(double)brlen) : 1;
long numColBlocks = leftCached ? 1 : (long)Math.ceil((double)clen/(double)bclen);
int buffCapacity = (int)Math.max(Math.min((memSize/elementSize), (numRowBlocks*numColBlocks)), 1);
super.allocateBuffer(buffCapacity, valueClass, false);
//local file management (if necessary)
int n = (int)Math.ceil((double)(numRowBlocks*numColBlocks)/(double)_bufferCapacity);
memOnly = (n==1);
if( !memOnly )
{
_job = conf;
_fs = FileSystem.getLocal(_job);
_fileN = n;
super.constructLocalFilePrefix("_input_cache_");
super.deleteAllWorkingFiles();
}
}
public int getCacheSize()
{
return cacheSize;
}
/**
*
* @param inIndex
* @param inValue
* @throws Exception
*/
public void put( long inIndex, MatrixValue inValue )
throws Exception
{
if( !memOnly )
{
int newFileCursor = (int) (cacheSize / _bufferCapacity);
if( _fileCursor!=-1 && _fileCursor!=newFileCursor ){
super.writeBuffer();
_bufferSize = 0;
}
_fileCursor = newFileCursor;
}
int lpos = cacheSize % _bufferCapacity;
Pair tmp = _buffer[lpos];
tmp.getKey().setIndexes(inIndex,inIndex);
tmp.getValue().copy(inValue);
_bufferSize++;
cacheSize++;
}
/**
*
* @param pos
* @return
* @throws IOException
*/
public Pair get( int pos )
throws IOException
{
if( !memOnly )
{
int newFileCursor = (int) (pos / _bufferCapacity);
if( _fileCursor!=newFileCursor )
{
//flush last cursor (on first get after put sequence)
if( !flushedAll ) {
super.writeBuffer();
_bufferSize = 0;
flushedAll = true;
}
//load new filecursor partition
_fileCursor = newFileCursor;
super.loadBuffer();
}
}
//get cached in-memory block
int lpos = pos % _bufferCapacity;
return _buffer[lpos];
}
/**
*
* @throws IOException
*/
public void resetCache()
throws IOException
{
//by default don't reset buffersize (e.g., for aggregator)
resetCache(false);
}
/**
* @throws IOException
*
*/
public void resetCache(boolean fullreset)
throws IOException
{
cacheSize = 0;
flushedAll = false;
if(fullreset)
_bufferSize = 0;
if( !memOnly )
super.deleteAllWorkingFiles();
}
public void close()
throws IOException
{
if( !memOnly )
super.deleteAllWorkingFiles();
}
}