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From "Duo Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16890) Analyze the performance of AsyncWAL and fix the same
Date Thu, 23 Nov 2017 09:47:01 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16264067#comment-16264067
] 

Duo Zhang commented on HBASE-16890:
-----------------------------------

[~ram_krish] Yes this is expected. Can you please try multiwal? And this is only one DN, not
the real cluster scenario, usually we will write to 3 DNs. And it is also expected that AsyncFSWAL
will not perform better on throughput under heavy workload as the connections to DN are the
same, no matter chained or fan-out you need to create 3 connections.

And [~chancelq], my question is, why the ops difference does not lead to run time difference?

Thanks.

> 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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