HDDS-10039. Remove the flushLatches set from FlushNotifier.

[szetszwo]

What changes were proposed in this pull request?

In FlushNotifier, it add a new latch to the flushLatches set for each await() call.

We may reduce the number of objects by using CompletableFuture. Then, the await() calls waiting for the same flush will use for the same future.

What is the link to the Apache JIRA

HDDS-10039

How was this patch tested?

By updating existing tests.

[GeorgeJahad]

smengcl requested a review from GeorgeJahad

@smengcl I'm on vacation and won't have time to look at this till I get back, (in 2 weeks.)

[szetszwo]

@smengcl , could you review this then?

[smengcl]

smengcl requested a review from GeorgeJahad

@smengcl I'm on vacation and won't have time to look at this till I get back, (in 2 weeks.)

Ah, got it. Enjoy you vacation!

@smengcl , could you review this then?

Yup, on it.

[smengcl]

Thanks @szetszwo for the patch. Nice map design here. flushCount works even when it overflows (2^31). I do have a few comments inline.

[szetszwo]

@smengcl , thanks a lot for reviewing this! Just have pushed a commit addressing your comment.

[smengcl]

Thanks @szetszwo for the improvement! Latest revision lgtm.

[adoroszlai]

Thanks @szetszwo for the patch, @smengcl for the review.

[szetszwo]

@smengcl , thanks for reviewing this!

@adoroszlai , thanks for merging this!