[jira] [Commented] (HBASE-20411) Ameliorate MutableSegment synchronize

["Yu Li (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-20411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16546503#comment-16546503 ] 

Yu Li commented on HBASE-20411:
-------------------------------

Noticed when checking 2.1.0RC1 compatibility report, that in this JIRA we have changed the visibility of {{MemStoreSize#constructors}} from public to package-private. Since {{MemStoreSize}} is not marked as IS.Evolving, and in our [refguide matrix|http://hbase.apache.org/book.html#hbase.versioning] we have below content:
 !compatibility-matrix.png! 

> Ameliorate MutableSegment synchronize
> -------------------------------------
>
>                 Key: HBASE-20411
>                 URL: https://issues.apache.org/jira/browse/HBASE-20411
>             Project: HBase
>          Issue Type: Bug
>            Reporter: stack
>            Assignee: huaxiang sun
>            Priority: Major
>             Fix For: 2.0.1
>
>         Attachments: 2.load.patched.17704.lock.svg, 2.load.patched.2.17704.lock.svg, 2.more.patch.12010.lock.svg, 2.pe.write.32026.lock.svg, 2.pe.write.ameliorate.106553.lock.svg, 41901.lock.svg, HBASE-20411-atomiclong-longadder.patch, 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, HBASE-20411.branch-2.0.008.patch, HBASE-20411.branch-2.0.009.patch, HBASE-20411.branch-2.0.010.patch, HBASE-20411.branch-2.0.011.patch, HBASE-20411.branch-2.0.012.patch, HBASE-20411.branch-2.0.013.patch, compatibility-matrix.png, jmc6.write_time_locks.png
>
>
> 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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