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https://issues.apache.org/jira/browse/HBASE-16890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16263797#comment-16263797
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ramkrishna.s.vasudevan commented on HBASE-16890:
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I think I need to repeat my test here. I checked the old comemnts and found one 
thing that was missing in recent tests. Increase the number of cols. will do 
that once now and report back. I think that was the difference.
The YCSB reports suggests that through put decrease though very small compared 
to FSHLog. That seems to be opposite to what I got. 

> Analyze the performance of AsyncWAL and fix the same
> ----------------------------------------------------
>
>                 Key: HBASE-16890
>                 URL: https://issues.apache.org/jira/browse/HBASE-16890
>             Project: HBase
>          Issue Type: Sub-task
>          Components: wal
>    Affects Versions: 2.0.0
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>            Priority: Blocker
>             Fix For: 2.0.0-beta-1
>
>         Attachments: AsyncWAL_disruptor.patch, AsyncWAL_disruptor_1 
> (2).patch, AsyncWAL_disruptor_3.patch, AsyncWAL_disruptor_3.patch, 
> AsyncWAL_disruptor_4.patch, AsyncWAL_disruptor_6.patch, 
> HBASE-16890-rc-v2.patch, HBASE-16890-rc-v3.patch, 
> HBASE-16890-remove-contention-v1.patch, HBASE-16890-remove-contention.patch, 
> Screen Shot 2016-10-25 at 7.34.47 PM.png, Screen Shot 2016-10-25 at 7.39.07 
> PM.png, Screen Shot 2016-10-25 at 7.39.48 PM.png, Screen Shot 2016-11-04 at 
> 5.21.27 PM.png, Screen Shot 2016-11-04 at 5.30.18 PM.png, async.svg, 
> classic.svg, contention.png, contention_defaultWAL.png, 
> ycsb_FSHlog.vs.Async.png
>
>
> Tests reveal that AsyncWAL under load in single node cluster performs slower 
> than the Default WAL. This task is to analyze and see if we could fix it.
> See some discussions in the tail of JIRA HBASE-15536.



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