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https://issues.apache.org/jira/browse/HBASE-16890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16263871#comment-16263871
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ramkrishna.s.vasudevan commented on HBASE-16890:
------------------------------------------------

I tried this out  (still on a single node cluster)
{code}
nohup ./hbase org.apache.hadoop.hbase.PerformanceEvaluation --nomapred 
--presplit=50 --size=50 --columns=50 --valueSize=200 --writeToWAL=true 
--bloomFilter=NONE randomWrite 50
{code}
AsyncWAL is faster in terms of throughput (completion time).
AsyncWAL
Avg: 1103134ms
FSHLog
Avg: 1280875ms
Though we have more cols the perf seems to be better for AsyncWAL. For now I 
have only one node . I can try with multiple nodes next week or so. But 
previously this one node test was showing FSHLog was faster and now that is not 
the case is what I get. I have not digged in to the logs like I did previously 
as currently doing something else. But I will do those next week or so. 

> 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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