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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16890) Analyze the performance of AsyncWAL and fix the same
Date Tue, 25 Oct 2016 20:40:58 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15606424#comment-15606424
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stack commented on HBASE-16890:
-------------------------------

I did a primitive compare with 100 threads, 10 columns on WALPE. The classic FSHLog in JFR
shows a few instances of FSOutputSummer#write and DFSOS#flushOrSync in samples (7 and 3 respectively).
The asyncwal by contrast has two orders of magnitude more points of contention showing up
in samples at append and sync (900 and 200). The sync on waitingConsumePayloads is a throughput
killer.

> 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
>             Fix For: 2.0.0
>
>         Attachments: contention.png, contention_defaultWAL.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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