Ngone51 commented on a change in pull request #30433:
URL: https://github.com/apache/spark/pull/30433#discussion_r529611998
##########
File path:
common/network-shuffle/src/main/java/org/apache/spark/network/shuffle/RemoteBlockPushResolver.java
##########
@@ -827,13 +833,16 @@ void resetChunkTracker() {
void updateChunkInfo(long chunkOffset, int mapIndex) throws IOException {
long idxStartPos = -1;
try {
- // update the chunk tracker to meta file before index file
- writeChunkTracker(mapIndex);
idxStartPos = indexFile.getFilePointer();
logger.trace("{} shuffleId {} reduceId {} updated index current {}
updated {}",
appShuffleId.appId, appShuffleId.shuffleId, reduceId,
this.lastChunkOffset,
chunkOffset);
- indexFile.writeLong(chunkOffset);
+ indexFile.write(Longs.toByteArray(chunkOffset));
+ // Chunk bitmap should be written to the meta file after the index
file because if there are
+ // any exceptions during writing the offset to the index file, meta
file should not be
+ // updated. If the update to the index file is successful but the
update to meta file isn't
+ // then the index file position is reset in the catch clause.
+ writeChunkTracker(mapIndex);
Review comment:
Tracking IO exceptions sounds a little bit complex to me...I'd prefer to
stop merging in case of IO exception for the seek.
Besides, I'm thinking it would be good if we could dynamically change the
merger location when such IO exception happens.
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