[HDDS-1624] Refactor operations inside the bucket lock in OM key write.

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Fix Version/s: 0.5.0
• Component/s: Ozone Manager
• Labels: pull-request-available
• Sprint: Done
• Assignee: Aravindan Vijayan
• Reporter: Aravindan Vijayan
• Created: 31/May/19 19:09
• Updated: 24/Feb/20 20:49
• Resolved: 04/Jun/19 22:41

Description

There are a few steps that are done inside the OM bucket lock that are lock invariant and can be done outside the lock. This patch refactors those steps. It also adds an isExist API in the metadata store so that we dont need to deserialize the byte[] to Object while doing a simple table.get(key) != null check.

On applying the patch, the OM + SCM (With dummy datanodes) write performance improves by around 3 - 6x based on number of existing keys in the OM RocksDB.

Thanks to nandakumar131 who helped with this patch.

Issue Links

• links to: GitHub Pull Request #882