avijayanhwx opened a new pull request #882: HDDS-1624 : Refactor operations 
inside the bucket lock in OM key write.
URL: https://github.com/apache/hadoop/pull/882
 
 
   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 3x.
   
   Thanks to @nandakumar131  who helped with this patch.

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