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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17673) Monitored RPC Handler not show in the WebUI
Date Fri, 24 Feb 2017 23:58:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17673?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15883796#comment-15883796
] 

Ted Yu commented on HBASE-17673:
--------------------------------

[~andrewcheng]:
Do you have other comment ?

Thanks

> Monitored RPC Handler not show in the WebUI
> -------------------------------------------
>
>                 Key: HBASE-17673
>                 URL: https://issues.apache.org/jira/browse/HBASE-17673
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 2.0.0, 3.0.0, 1.2.4, 1.1.8
>            Reporter: Allan Yang
>            Assignee: Allan Yang
>            Priority: Minor
>         Attachments: HBASE-17673-branch-1.patch, HBASE-17673.patch
>
>
> This issue has been fixed once in HBASE-14674. But, I noticed that almost all RS in our
production environment still have this problem. Strange thing is that newly started servers
seems do not affected. Digging for a while, then I realize the {{CircularFifoBuffer}} introduced
by HBASE-10312 is the root cause. The RPC hander's monitoredTask only create once, if the
server is flooded with tasks, RPC monitoredTask can be purged by CircularFifoBuffer, and then
never visible in WebUI.
> So my solution is creating a list for RPC monitoredTask separately. It is OK to do so
since the RPC handlers remain in a fixed number. It won't increase or decrease during the
lifetime of the server.



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