HDDS-2753. Test OM Volume and Bucket operations are idempotent.

[hanishakoneru]

What changes were proposed in this pull request?

On OM restarts, it is possible that already applied ratis logs will be replayed. Hence, we need to ensure that all OM write operations are idempotent.
This Jira aims to add unit tests for testing that OM volume and bucket related operations are idempotent.

What is the link to the Apache JIRA

https://issues.apache.org/jira/browse/HDDS-2753

How was this patch tested?

This Jira is for adding a unit test.

[cxorm]

Thanks @hanishakoneru for the PR.
Some violations detected by checkstyle.

[bshashikant]

Thanks @hanishakoneru for working on this. Instead of exposing a public API to force set last AppliedTermIndex on stateMachine, we can just do some operations, trigger a ratis snapshhot , do some more operations and restart. It will ensure replay will happen from lastSnapshotIndex?

Is there any specific need to add an api to force set lastAppliedIndex?

[elek]

/pending Waiting for the answer of the author

[github-actions]

Marking this issue as un-mergeable as requested.

Please use /ready comment when it's resolved.

Waiting for the answer of the author

[adoroszlai]

/close

[github-actions]

Thank you very much for the patch. I am closing this PR temporarily as there was no
activity recently and it is waiting for response from its author.

It doesn't mean that this PR is not important or ignored: feel free to reopen the PR at any time.

It only means that attention of committers is not required. We prefer to keep the review queue clean. This ensures PRs in need of review are more visible, which results in faster feedback for all PRs.

If you need ANY help to finish this PR, please contact the community on the mailing list or the slack channel.