mridulm commented on code in PR #37922:
URL: https://github.com/apache/spark/pull/37922#discussion_r1059526011
##########
common/network-shuffle/src/main/java/org/apache/spark/network/shuffle/RemoteBlockPushResolver.java:
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@@ -396,6 +403,56 @@ public void applicationRemoved(String appId, boolean
cleanupLocalDirs) {
}
}
+ @Override
+ public void removeShuffleMerge(RemoveShuffleMerge msg) {
+ AppShuffleInfo appShuffleInfo = validateAndGetAppShuffleInfo(msg.appId);
+ if (appShuffleInfo.attemptId != msg.appAttemptId) {
+ throw new IllegalArgumentException(
+ String.format("The attempt id %s in this RemoveShuffleMerge message
does not match "
+ + "with the current attempt id %s stored in shuffle service
for application %s",
+ msg.appAttemptId, appShuffleInfo.attemptId, msg.appId));
+ }
+ appShuffleInfo.shuffles.computeIfPresent(msg.shuffleId, (shuffleId,
mergePartitionsInfo) -> {
+ boolean deleteCurrent =
+ msg.shuffleMergeId == DELETE_CURRENT_MERGED_SHUFFLE_ID ||
+ msg.shuffleMergeId == mergePartitionsInfo.shuffleMergeId;
+ AppAttemptShuffleMergeId currentAppAttemptShuffleMergeId =
+ new AppAttemptShuffleMergeId(
+ msg.appId, msg.appAttemptId, msg.shuffleId,
mergePartitionsInfo.shuffleMergeId);
+ AppAttemptShuffleMergeId appAttemptShuffleMergeId = new
AppAttemptShuffleMergeId(
+ msg.appId, msg.appAttemptId, msg.shuffleId, msg.shuffleMergeId);
+ if(deleteCurrent) {
+ // request to clean up shuffle we are currently hosting
+ if (!mergePartitionsInfo.isFinalized()) {
+ submitCleanupTask(() -> {
+ closeAndDeleteOutdatedPartitions(
+ currentAppAttemptShuffleMergeId,
mergePartitionsInfo.shuffleMergePartitions);
+ writeAppAttemptShuffleMergeInfoToDB(appAttemptShuffleMergeId);
+ });
+ } else {
+ submitCleanupTask(() -> {
+ deleteMergedFiles(currentAppAttemptShuffleMergeId,
+ mergePartitionsInfo.getReduceIds());
+ writeAppAttemptShuffleMergeInfoToDB(appAttemptShuffleMergeId);
+ mergePartitionsInfo.setReduceIds(new int[0]);
+ });
+ }
+ } else if(msg.shuffleMergeId < mergePartitionsInfo.shuffleMergeId) {
+ throw new RuntimeException(String.format("Asked to remove old shuffle
merged data for " +
+ "application %s shuffleId %s shuffleMergeId %s, but current
shuffleMergeId %s ",
+ msg.appId, msg.shuffleId, msg.shuffleMergeId,
mergePartitionsInfo.shuffleMergeId));
+ } else if (msg.shuffleMergeId > mergePartitionsInfo.shuffleMergeId) {
+ // cleanup request for newer shuffle - remove the outdated data we
have.
+ submitCleanupTask(() -> {
+ closeAndDeleteOutdatedPartitions(
+ currentAppAttemptShuffleMergeId,
mergePartitionsInfo.shuffleMergePartitions);
+ writeAppAttemptShuffleMergeInfoToDB(appAttemptShuffleMergeId);
Review Comment:
I am not sure I understand the concern.
`closeAndDeleteOutdatedPartitions` does two things -
* cleanup finalization details from DB.
* cleanup files from disk.
Both of these can be done lazily.
We are only keeping `appShuffleInfo.shuffles` consistent with the DB, and
use that to filter during recovery.
Note - there is a bug in `finalizeShuffleMerge`, as I mentioned earlier
[here](https://github.com/apache/spark/pull/37922#discussion_r990753031) (see
the last part of my comment) ... so please keep that in mind when analyzing
this codepath (SPARK-41792).
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