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https://issues.apache.org/jira/browse/HBASE-15536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15585417#comment-15585417
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ramkrishna.s.vasudevan commented on HBASE-15536:
------------------------------------------------

I would generally say that pls do not consider the profile report in terms of 
comparisons in CellComparator. It is always in the top but sometimes it tends 
to vary because
-> Not always profilers give the source of truth
-> Next is that all the comparsions are going to be same like the mutations 
added to memstore and the Scanquerymatcher that does comparsions during 
flushes/compactions.
Ya may be in default case comparisoins are more because they are much faster so 
more flushes/compactions?
As I said the profile does not immediately give the hot spot. But there is 
something other than the comparators that we need to check. I will report back 
on this tomorrow after doing some more analysis.

> Make AsyncFSWAL as our default WAL
> ----------------------------------
>
>                 Key: HBASE-15536
>                 URL: https://issues.apache.org/jira/browse/HBASE-15536
>             Project: HBase
>          Issue Type: Sub-task
>          Components: wal
>    Affects Versions: 2.0.0
>            Reporter: Duo Zhang
>            Assignee: Duo Zhang
>            Priority: Critical
>             Fix For: 2.0.0
>
>         Attachments: HBASE-15536-v1.patch, HBASE-15536-v2.patch, 
> HBASE-15536-v3.patch, HBASE-15536-v4.patch, HBASE-15536-v5.patch, 
> HBASE-15536.patch, latesttrunk_asyncWAL_50threads_10cols.jfr, 
> latesttrunk_defaultWAL_50threads_10cols.jfr
>
>
> As it should be predicated on passing basic cluster ITBLL



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