stack commented on HBASE-20411:

Attached svg is from ycsb load phase. Shows that its worth spending time on 
this synchronize. In this sample, it looks like we show as stuck here 62% of 
the time. The remainder is mostly given over to the Semaphore that we have in 
RPC scheduling.

> Ameliorate MutableSegment synchronize
> -------------------------------------
>                 Key: HBASE-20411
>                 URL: https://issues.apache.org/jira/browse/HBASE-20411
>             Project: HBase
>          Issue Type: Bug
>            Reporter: stack
>            Priority: Major
>         Attachments: 41901.lock.svg
> This item is migrated from HBASE-20236 so it gets dedicated issue.
> Let me upload evidence that has this synchronize as a stake in our write-time 
> perf. I'll migrate the patch I posted with updates that come of comments 
> posted by [~mdrob] on the HBASE-20236 issue.

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