stack commented on HBASE-20411:

2.simple.patch.69074.lock.svg is what our locking profile looks like after this 
patch has been applied. Blocking on MutableSegment has been removed. We are 
left with the Semaphore on RPC scheduling and mvcc completion (This makes our 
locking profile looks like 1.2.7 again). Not much by way of perf improvement 

> 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: 2.load.patched.17704.lock.svg, 
> 2.load.patched.2.17704.lock.svg, 2.more.patch.12010.lock.svg, 41901.lock.svg, 
> HBASE-20411.branch-2.0.001.patch, HBASE-20411.branch-2.0.002.patch, 
> HBASE-20411.branch-2.0.003.patch, HBASE-20411.branch-2.0.004.patch, 
> HBASE-20411.branch-2.0.005.patch, HBASE-20411.branch-2.0.006.patch, 
> HBASE-20411.branch-2.0.007.patch
> 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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