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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6974) Metric for blocked updates
Date Wed, 17 Oct 2012 22:42:03 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13478468#comment-13478468
] 

Lars Hofhansl commented on HBASE-6974:
--------------------------------------

This is a low risk change, going to commit soon, unless I hear an objections.
                
> Metric for blocked updates
> --------------------------
>
>                 Key: HBASE-6974
>                 URL: https://issues.apache.org/jira/browse/HBASE-6974
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Assignee: Michael Drzal
>            Priority: Critical
>             Fix For: 0.94.3, 0.96.0
>
>         Attachments: HBASE-6974.patch, HBASE-6974-v2.patch, HBASE-6974-v3.patch, HBASE-6974-v4.patch
>
>
> When the disc subsystem cannot keep up with a sustained high write load, a region will
eventually block updates to throttle clients.
> (HRegion.checkResources).
> It would be nice to have a metric for this, so that these occurrences can be tracked.

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