saurabhd336 commented on code in PR #3132:
URL: https://github.com/apache/celeborn/pull/3132#discussion_r1986120691
##########
client/src/main/java/org/apache/celeborn/client/read/WorkerPartitionReader.java:
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@@ -210,14 +224,34 @@ public PartitionLocation getLocation() {
return location;
}
+ @Override
+ public WorkerPartitionReaderCheckpointMetadata
getPartitionReaderCheckpointMetadata() {
+ return isCheckpointEnabled
+ ? new WorkerPartitionReaderCheckpointMetadata(chunkIdsAlreadyReturned)
+ : null;
+ }
+
+ @Override
+ public void updateCheckpointMetadata(WorkerPartitionReaderCheckpointMetadata
checkpointMetadata) {
+ chunkIdsAlreadyReturned = checkpointMetadata.getReturnedChunks();
+ }
+
private void fetchChunks() throws IOException, InterruptedException {
final int inFlight = chunkIndex - startChunkIndex - returnedChunks;
if (inFlight < fetchMaxReqsInFlight) {
- final int toFetch =
- Math.min(fetchMaxReqsInFlight - inFlight + 1, endChunkIndex + 1 -
chunkIndex);
- for (int i = 0; i < toFetch; i++) {
- if (testFetch && fetchChunkRetryCnt < fetchChunkMaxRetry - 1 &&
chunkIndex == 3) {
+ int toFetch = Math.min(fetchMaxReqsInFlight - inFlight + 1,
endChunkIndex + 1 - chunkIndex);
+
+ while (toFetch > 0 && chunkIndex <= endChunkIndex) {
+ if (chunkIdsAlreadyReturned.contains(chunkIndex)) {
+ logger.info(
+ "Skipping chunk {} as it has already been returned,"
+ + " likely by a previous reader for the same partition.",
+ chunkIndex);
+ chunkIndex++;
+ returnedChunks++;
Review Comment:
Actually, come to think of it, incrementing toFetch here would be wrong and
cause an infinite wait. I added a comment explaining it.
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