// output the records in the outCache.
public void close() throws IOException {
long start = System.currentTimeMillis();
Iterator<Entry<MatrixIndexes, MatrixValue>> it = outCache.entrySet().iterator();
while (it.hasNext()) {
Entry<MatrixIndexes, MatrixValue> entry = it.next();
realWriteToCollector(entry.getKey(), entry.getValue());
}
// handle empty block output (on first reduce task only)
if (outputDummyRecords) // required for rejecting empty blocks in mappers
{
long rlen = dim1.getRows();
long clen = dim2.getCols();
int brlen = dim1.getRowsPerBlock();
int bclen = dim2.getColsPerBlock();
MatrixIndexes tmpIx = new MatrixIndexes();
MatrixBlock tmpVal = new MatrixBlock();
for (long i = 0, r = 1; i < rlen; i += brlen, r++)
for (long j = 0, c = 1; j < clen; j += bclen, c++) {
int realBrlen = (int) Math.min((long) brlen, rlen - (r - 1) * brlen);
int realBclen = (int) Math.min((long) bclen, clen - (c - 1) * bclen);
tmpIx.setIndexes(r, c);
tmpVal.reset(realBrlen, realBclen);
collectFinalMultipleOutputs.collectOutput(tmpIx, tmpVal, 0, cachedReporter);
}
}
if (cachedReporter != null)
cachedReporter.incrCounter(
Counters.COMBINE_OR_REDUCE_TIME, System.currentTimeMillis() - start);
super.close();
}
/**
* @param path
* @param job
* @param fs
* @param dest
* @param rlen
* @param clen
* @param brlen
* @param bclen
* @throws IOException
* @throws IllegalAccessException
* @throws InstantiationException
*/
@SuppressWarnings("deprecation")
private void readBinaryBlockMatrixBlocksFromHDFS(
Path path,
JobConf job,
FileSystem fs,
Collection<IndexedMatrixValue> dest,
long rlen,
long clen,
int brlen,
int bclen)
throws IOException {
MatrixIndexes key = new MatrixIndexes();
MatrixBlock value = new MatrixBlock();
// set up preferred custom serialization framework for binary block format
if (MRJobConfiguration.USE_BINARYBLOCK_SERIALIZATION)
MRJobConfiguration.addBinaryBlockSerializationFramework(job);
for (Path lpath : getSequenceFilePaths(fs, path)) // 1..N files
{
// directly read from sequence files (individual partfiles)
SequenceFile.Reader reader = new SequenceFile.Reader(fs, lpath, job);
try {
while (reader.next(key, value)) {
int row_offset = (int) (key.getRowIndex() - 1) * brlen;
int col_offset = (int) (key.getColumnIndex() - 1) * bclen;
int rows = value.getNumRows();
int cols = value.getNumColumns();
// bound check per block
if (row_offset + rows < 0
|| row_offset + rows > rlen
|| col_offset + cols < 0
|| col_offset + cols > clen) {
throw new IOException(
"Matrix block ["
+ (row_offset + 1)
+ ":"
+ (row_offset + rows)
+ ","
+ (col_offset + 1)
+ ":"
+ (col_offset + cols)
+ "] "
+ "out of overall matrix range [1:"
+ rlen
+ ",1:"
+ clen
+ "].");
}
// copy block to result
dest.add(new IndexedMatrixValue(new MatrixIndexes(key), new MatrixBlock(value)));
}
} finally {
IOUtilFunctions.closeSilently(reader);
}
}
}
@Override
protected Tuple2<MatrixIndexes, MatrixBlock> computeNext(Tuple2<MatrixIndexes, MatrixBlock> arg)
throws Exception {
// unpack partition key-value pairs
MatrixIndexes ix = arg._1();
MatrixBlock in1 = arg._2();
// get the rhs block
int rix = (int) ((_vtype == VectorType.COL_VECTOR) ? ix.getRowIndex() : 1);
int cix = (int) ((_vtype == VectorType.COL_VECTOR) ? 1 : ix.getColumnIndex());
MatrixBlock in2 = _pmV.getMatrixBlock(rix, cix);
// execute the binary operation
MatrixBlock ret = (MatrixBlock) (in1.binaryOperations(_op, in2, new MatrixBlock()));
return new Tuple2<MatrixIndexes, MatrixBlock>(ix, ret);
}
@Override
public MatrixBlock readMatrixFromHDFS(
String fname, long rlen, long clen, int brlen, int bclen, long estnnz)
throws IOException, DMLRuntimeException {
// allocate output matrix block
MatrixBlock ret = createOutputMatrixBlock(rlen, clen, estnnz, false, false);
// prepare file access
JobConf job = new JobConf();
FileSystem fs = _localFS ? FileSystem.getLocal(job) : FileSystem.get(job);
Path path = new Path((_localFS ? "file:///" : "") + fname);
// check existence and non-empty file
checkValidInputFile(fs, path);
// core read
readBinaryBlockMatrixFromHDFS(path, job, fs, ret, rlen, clen, brlen, bclen);
// finally check if change of sparse/dense block representation required
ret.recomputeNonZeros();
ret.examSparsity();
return ret;
}
/**
* Note: For efficiency, we directly use SequenceFile.Reader instead of SequenceFileInputFormat-
* InputSplits-RecordReader (SequenceFileRecordReader). First, this has no drawbacks since the
* SequenceFileRecordReader internally uses SequenceFile.Reader as well. Second, it is
* advantageous if the actual sequence files are larger than the file splits created by
* informat.getSplits (which is usually aligned to the HDFS block size) because then there is
* overhead for finding the actual split between our 1k-1k blocks. This case happens if the read
* matrix was create by CP or when jobs directly write to large output files (e.g., parfor matrix
* partitioning).
*
* @param path
* @param job
* @param fs
* @param dest
* @param rlen
* @param clen
* @param brlen
* @param bclen
* @throws IOException
* @throws IllegalAccessException
* @throws InstantiationException
* @throws DMLRuntimeException
*/
@SuppressWarnings("deprecation")
private static void readBinaryBlockMatrixFromHDFS(
Path path,
JobConf job,
FileSystem fs,
MatrixBlock dest,
long rlen,
long clen,
int brlen,
int bclen)
throws IOException, DMLRuntimeException {
boolean sparse = dest.isInSparseFormat();
MatrixIndexes key = new MatrixIndexes();
MatrixBlock value = new MatrixBlock();
// set up preferred custom serialization framework for binary block format
if (MRJobConfiguration.USE_BINARYBLOCK_SERIALIZATION)
MRJobConfiguration.addBinaryBlockSerializationFramework(job);
for (Path lpath : getSequenceFilePaths(fs, path)) // 1..N files
{
// directly read from sequence files (individual partfiles)
SequenceFile.Reader reader = new SequenceFile.Reader(fs, lpath, job);
try {
// note: next(key, value) does not yet exploit the given serialization classes, record
// reader does but is generally slower.
while (reader.next(key, value)) {
// empty block filter (skip entire block)
if (value.isEmptyBlock(false)) continue;
int row_offset = (int) (key.getRowIndex() - 1) * brlen;
int col_offset = (int) (key.getColumnIndex() - 1) * bclen;
int rows = value.getNumRows();
int cols = value.getNumColumns();
// bound check per block
if (row_offset + rows < 0
|| row_offset + rows > rlen
|| col_offset + cols < 0
|| col_offset + cols > clen) {
throw new IOException(
"Matrix block ["
+ (row_offset + 1)
+ ":"
+ (row_offset + rows)
+ ","
+ (col_offset + 1)
+ ":"
+ (col_offset + cols)
+ "] "
+ "out of overall matrix range [1:"
+ rlen
+ ",1:"
+ clen
+ "].");
}
// copy block to result
if (sparse) {
dest.appendToSparse(value, row_offset, col_offset);
// note: append requires final sort
} else {
dest.copy(
row_offset, row_offset + rows - 1, col_offset, col_offset + cols - 1, value, false);
}
}
} finally {
IOUtilFunctions.closeSilently(reader);
}
}
if (sparse && clen > bclen) {
// no need to sort if 1 column block since always sorted
dest.sortSparseRows();
}
}
/**
* @param path
* @param job
* @param src
* @param rlen
* @param clen
* @param brlen
* @param bclen
* @throws IOException
*/
protected void writeTextCellMatrixToHDFS(
Path path, JobConf job, MatrixBlock src, long rlen, long clen) throws IOException {
boolean sparse = src.isInSparseFormat();
boolean entriesWritten = false;
FileSystem fs = FileSystem.get(job);
BufferedWriter br = new BufferedWriter(new OutputStreamWriter(fs.create(path, true)));
int rows = src.getNumRows();
int cols = src.getNumColumns();
// bound check per block
if (rows > rlen || cols > clen) {
throw new IOException(
"Matrix block [1:"
+ rows
+ ",1:"
+ cols
+ "] "
+ "out of overall matrix range [1:"
+ rlen
+ ",1:"
+ clen
+ "].");
}
try {
// for obj reuse and preventing repeated buffer re-allocations
StringBuilder sb = new StringBuilder();
if (sparse) // SPARSE
{
SparseRowsIterator iter = src.getSparseRowsIterator();
while (iter.hasNext()) {
IJV cell = iter.next();
sb.append(cell.i + 1);
sb.append(' ');
sb.append(cell.j + 1);
sb.append(' ');
sb.append(cell.v);
sb.append('\n');
br.write(sb.toString()); // same as append
sb.setLength(0);
entriesWritten = true;
}
} else // DENSE
{
for (int i = 0; i < rows; i++) {
String rowIndex = Integer.toString(i + 1);
for (int j = 0; j < cols; j++) {
double lvalue = src.getValueDenseUnsafe(i, j);
if (lvalue != 0) // for nnz
{
sb.append(rowIndex);
sb.append(' ');
sb.append(j + 1);
sb.append(' ');
sb.append(lvalue);
sb.append('\n');
br.write(sb.toString()); // same as append
sb.setLength(0);
entriesWritten = true;
}
}
}
}
// handle empty result
if (!entriesWritten) {
br.write("1 1 0\n");
}
} finally {
IOUtilFunctions.closeSilently(br);
}
}