mccheah commented on a change in pull request #25007:
[SPARK-28209][CORE][SHUFFLE] Proposed new shuffle writer API
URL: https://github.com/apache/spark/pull/25007#discussion_r301316319
##########
File path:
core/src/main/java/org/apache/spark/shuffle/sort/BypassMergeSortShuffleWriter.java
##########
@@ -179,37 +195,57 @@ public void write(Iterator<Product2<K, V>> records)
throws IOException {
*
* @return array of lengths, in bytes, of each partition of the file (used
by map output tracker).
*/
- private long[] writePartitionedFile(File outputFile) throws IOException {
+ private long[] writePartitionedData(ShuffleMapOutputWriter mapOutputWriter)
throws IOException {
// Track location of the partition starts in the output file
final long[] lengths = new long[numPartitions];
if (partitionWriters == null) {
// We were passed an empty iterator
return lengths;
}
-
- final FileOutputStream out = new FileOutputStream(outputFile, true);
final long writeStartTime = System.nanoTime();
- boolean threwException = true;
try {
for (int i = 0; i < numPartitions; i++) {
final File file = partitionWriterSegments[i].file();
+ ShufflePartitionWriter writer = mapOutputWriter.getPartitionWriter(i);
if (file.exists()) {
- final FileInputStream in = new FileInputStream(file);
boolean copyThrewException = true;
- try {
- lengths[i] = Utils.copyStream(in, out, false, transferToEnabled);
- copyThrewException = false;
- } finally {
- Closeables.close(in, copyThrewException);
+ if (transferToEnabled) {
+ FileInputStream in = new FileInputStream(file);
+ TransferrableWritableByteChannel outputChannel = null;
+ try (FileChannel inputChannel = in.getChannel()) {
+ if (writer instanceof SupportsTransferTo) {
+ outputChannel = ((SupportsTransferTo)
writer).openTransferrableChannel();
Review comment:
And I'm not sure we want to add a comment here until we have the parallel
implementation in `UnsafeShuffleWriter`, which I've broken off into a separate
patch. We can add the documentation there so that the comparison is more
obvious. Thoughts?
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