HDDS-11174. [hsync] Change XceiverClientRatis.watchForCommit to async.

[szetszwo]

What changes were proposed in this pull request?

In the code below, it should just return the replyFuture instead of calling CompletableFuture.get(). This change is useful for HDDS-9844.

//XceiverClientRatis.watchForCommit
      CompletableFuture<RaftClientReply> replyFuture = getClient().async().watch(index, watchType);
      final RaftClientReply reply = replyFuture.get();

What is the link to the Apache JIRA

HDDS-11174

How was this patch tested?

Updating existing tests.

[szetszwo]

@duongkame and @smengcl , I will keep RatisBlockOutputStream unchanged here. Filed HDDS-11208 to do the further change. Please review this when you have time. Thanks.

[jojochuang]

This PR won't make it into the HDDS-7593 feature branch before the branch gets merged next week.
Please rebase onto master branch after the branch merge. Thanks!

[jojochuang]

LGTM. But the PR has a code conflict, and we're about to merge the feature branch into master, so please rebase against master after the branch is merged into master (should take at most another day).

Thanks!

[szetszwo]

Sure, will fix the conflicts after the merge.

[smengcl]

Shall we also change this one to watchForCommitAsync without breaking compatibility?

[smengcl]

Shall we change this one to watchForCommitAsync without breaking compatibility?

[smengcl]

Thanks @szetszwo . +1 other than the nits above.

[smengcl]

Would you like to take a glance at this @duongkame ?

[jojochuang]

Merged. Thanks @smengcl @szetszwo

[szetszwo]

@jojochuang , @smengcl , thanks for your helps!