public boolean computeDimension(MatrixCharacteristics in, MatrixCharacteristics out)
throws DMLRuntimeException {
out.set(1, 1, in.getRowsPerBlock(), in.getColsPerBlock());
return true;
}
@Override
public void processInstruction(ExecutionContext ec)
throws DMLRuntimeException, DMLUnsupportedOperationException {
SparkExecutionContext sec = (SparkExecutionContext) ec;
// get filename (literal or variable expression)
String fname =
ec.getScalarInput(input2.getName(), ValueType.STRING, input2.isLiteral()).getStringValue();
try {
// if the file already exists on HDFS, remove it.
MapReduceTool.deleteFileIfExistOnHDFS(fname);
// prepare output info according to meta data
String outFmt = input3.getName();
OutputInfo oi = OutputInfo.stringToOutputInfo(outFmt);
// get input rdd
JavaPairRDD<MatrixIndexes, MatrixBlock> in1 =
sec.getBinaryBlockRDDHandleForVariable(input1.getName());
MatrixCharacteristics mc = sec.getMatrixCharacteristics(input1.getName());
if (oi == OutputInfo.MatrixMarketOutputInfo || oi == OutputInfo.TextCellOutputInfo) {
// recompute nnz if necessary (required for header if matrix market)
if (isInputMatrixBlock && !mc.nnzKnown())
mc.setNonZeros(SparkUtils.computeNNZFromBlocks(in1));
JavaRDD<String> header = null;
if (outFmt.equalsIgnoreCase("matrixmarket")) {
ArrayList<String> headerContainer = new ArrayList<String>(1);
// First output MM header
String headerStr =
"%%MatrixMarket matrix coordinate real general\n"
+
// output number of rows, number of columns and number of nnz
mc.getRows()
+ " "
+ mc.getCols()
+ " "
+ mc.getNonZeros();
headerContainer.add(headerStr);
header = sec.getSparkContext().parallelize(headerContainer);
}
JavaRDD<String> ijv =
in1.flatMap(
new ConvertMatrixBlockToIJVLines(mc.getRowsPerBlock(), mc.getColsPerBlock()));
if (header != null) customSaveTextFile(header.union(ijv), fname, true);
else customSaveTextFile(ijv, fname, false);
} else if (oi == OutputInfo.CSVOutputInfo) {
JavaRDD<String> out = null;
Accumulator<Double> aNnz = null;
if (isInputMatrixBlock) {
// piggyback nnz computation on actual write
if (!mc.nnzKnown()) {
aNnz = sec.getSparkContext().accumulator(0L);
in1 = in1.mapValues(new ComputeBinaryBlockNnzFunction(aNnz));
}
out =
RDDConverterUtils.binaryBlockToCsv(
in1, mc, (CSVFileFormatProperties) formatProperties, true);
} else {
// This case is applicable when the CSV output from transform() is written out
@SuppressWarnings("unchecked")
JavaPairRDD<Long, String> rdd =
(JavaPairRDD<Long, String>)
((MatrixObject) sec.getVariable(input1.getName())).getRDDHandle().getRDD();
out = rdd.values();
String sep = ",";
boolean hasHeader = false;
if (formatProperties != null) {
sep = ((CSVFileFormatProperties) formatProperties).getDelim();
hasHeader = ((CSVFileFormatProperties) formatProperties).hasHeader();
}
if (hasHeader) {
StringBuffer buf = new StringBuffer();
for (int j = 1; j < mc.getCols(); j++) {
if (j != 1) {
buf.append(sep);
}
buf.append("C" + j);
}
ArrayList<String> headerContainer = new ArrayList<String>(1);
headerContainer.add(0, buf.toString());
JavaRDD<String> header = sec.getSparkContext().parallelize(headerContainer);
out = header.union(out);
}
}
customSaveTextFile(out, fname, false);
if (isInputMatrixBlock && !mc.nnzKnown()) mc.setNonZeros((long) aNnz.value().longValue());
} else if (oi == OutputInfo.BinaryBlockOutputInfo) {
// piggyback nnz computation on actual write
Accumulator<Double> aNnz = null;
if (!mc.nnzKnown()) {
aNnz = sec.getSparkContext().accumulator(0L);
in1 = in1.mapValues(new ComputeBinaryBlockNnzFunction(aNnz));
}
// save binary block rdd on hdfs
in1.saveAsHadoopFile(
fname, MatrixIndexes.class, MatrixBlock.class, SequenceFileOutputFormat.class);
if (!mc.nnzKnown()) mc.setNonZeros((long) aNnz.value().longValue());
} else {
// unsupported formats: binarycell (not externalized)
throw new DMLRuntimeException("Unexpected data format: " + outFmt);
}
// write meta data file
MapReduceTool.writeMetaDataFile(fname + ".mtd", ValueType.DOUBLE, mc, oi, formatProperties);
} catch (IOException ex) {
throw new DMLRuntimeException("Failed to process write instruction", ex);
}
}