Github user 10110346 commented on a diff in the pull request:
https://github.com/apache/spark/pull/22163#discussion_r212165385
--- Diff:
core/src/main/java/org/apache/spark/shuffle/sort/ShuffleExternalSorter.java ---
@@ -206,14 +211,21 @@ private void writeSortedFile(boolean isLastFile) {
long recordReadPosition = recordOffsetInPage + uaoSize; // skip over
record length
while (dataRemaining > 0) {
final int toTransfer = Math.min(diskWriteBufferSize,
dataRemaining);
- Platform.copyMemory(
- recordPage, recordReadPosition, writeBuffer,
Platform.BYTE_ARRAY_OFFSET, toTransfer);
- writer.write(writeBuffer, 0, toTransfer);
+ if (bufferOffset > 0 && bufferOffset + toTransfer >
DISK_WRITE_BUFFER_SIZE) {
--- End diff --
Yeah, this result of `_bytesWritten` would not have been updated
synchronously before, you can see this condition:`if (numRecordsWritten % 16384
== 0)`.
But we do not need worry. the final result is correct, because it will be
updated in `commitAndGet`
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