coderzc commented on code in PR #19138:
URL: https://github.com/apache/pulsar/pull/19138#discussion_r1070985106
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pulsar-broker/src/main/java/org/apache/pulsar/broker/delayed/bucket/BucketDelayedDeliveryTracker.java:
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@@ -243,6 +263,53 @@ public synchronized boolean addMessage(long ledgerId, long
entryId, long deliver
return true;
}
+ private synchronized CompletableFuture<Void> asyncMergeBucketSnapshot() {
+ List<ImmutableBucket> values =
immutableBuckets.asMapOfRanges().values().stream().toList();
+ long minNumberMessages = Long.MAX_VALUE;
+ int minIndex = -1;
+ for (int i = 0; i + 1 < values.size(); i++) {
+ ImmutableBucket bucketL = values.get(i);
+ ImmutableBucket bucketR = values.get(i + 1);
+ long numberMessages = bucketL.numberBucketDelayedMessages +
bucketR.numberBucketDelayedMessages;
+ if (numberMessages < minNumberMessages) {
+ minNumberMessages = (int) numberMessages;
+ minIndex = i;
+ }
+ }
+ return asyncMergeBucketSnapshot(values.get(minIndex),
values.get(minIndex + 1));
+ }
+
+ private synchronized CompletableFuture<Void>
asyncMergeBucketSnapshot(ImmutableBucket bucketA,
+
ImmutableBucket bucketB) {
+ immutableBuckets.remove(Range.closed(bucketA.startLedgerId,
bucketA.endLedgerId));
+ immutableBuckets.remove(Range.closed(bucketB.startLedgerId,
bucketB.endLedgerId));
+
+ CompletableFuture<Long> snapshotCreateFutureA =
+
bucketA.getSnapshotCreateFuture().orElse(CompletableFuture.completedFuture(null));
+ CompletableFuture<Long> snapshotCreateFutureB =
+
bucketB.getSnapshotCreateFuture().orElse(CompletableFuture.completedFuture(null));
+
+ return CompletableFuture.allOf(snapshotCreateFutureA,
snapshotCreateFutureB).thenCompose(__ -> {
+
CompletableFuture<List<DelayedMessageIndexBucketSnapshotFormat.SnapshotSegment>>
futureA =
+ bucketA.getRemainSnapshotSegment();
+
CompletableFuture<List<DelayedMessageIndexBucketSnapshotFormat.SnapshotSegment>>
futureB =
+ bucketB.getRemainSnapshotSegment();
+ return futureA.thenCombine(futureB,
CombinedSegmentDelayedIndexQueue::wrap)
+ .thenCompose(combinedDelayedIndexQueue -> {
+ CompletableFuture<Void> removeAFuture =
bucketA.asyncDeleteBucketSnapshot();
+ CompletableFuture<Void> removeBFuture =
bucketB.asyncDeleteBucketSnapshot();
+
+ return CompletableFuture.allOf(removeAFuture,
removeBFuture).thenRun(() -> {
Review Comment:
> Can we mark the old segment as deleting or merging? So that we can
continue the merge operation after the broker crashes.
This will introduce more state in metadata, we can improve it when we really
need it
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