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From "stack (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3565) Add a metric to keep track of slow HLog appends
Date Wed, 11 Jan 2012 06:24:40 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13183904#comment-13183904

stack commented on HBASE-3565:

Patch looks good to me.  I think the tsdb lads are going to come through and make us undo
resetting of metrics; they argue that should be done out in the monitoring system.... let
it figure intervals to measure across.. hbase should just keep outputting counts and times.
 But lets commit this meantime.
> Add a metric to keep track of slow HLog appends
> -----------------------------------------------
>                 Key: HBASE-3565
>                 URL: https://issues.apache.org/jira/browse/HBASE-3565
>             Project: HBase
>          Issue Type: Improvement
>          Components: metrics, regionserver
>            Reporter: Benoit Sigoure
>            Assignee: Mubarak Seyed
>              Labels: monitoring
>             Fix For: 0.94.0
>         Attachments: HBASE-3565.trunk.v1.patch
> Whenever an edit takes too long to be written to an HLog, HBase logs a warning such as
this one:
> {code}
> 2011-02-23 20:03:14,703 WARN org.apache.hadoop.hbase.regionserver.wal.HLog: IPC Server
handler 21 on 60020 took 15065ms appending an edit to hlog; editcount=126050
> {code}
> I would like to have a counter incremented each time this happens and this counter exposed
via the metrics stuff in HBase so I can collect it in my monitoring system.

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