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From "Michael Drzal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6974) Metric for blocked updates
Date Wed, 17 Oct 2012 14:12:03 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13477905#comment-13477905
] 

Michael Drzal commented on HBASE-6974:
--------------------------------------

[~lhofhansl] 
- 1024 ms to s conversion fixed.  I think I spent too much time converting bytes around, sorry
- I'll add in the memstore flusher metric and post a patch in a bit
- I'll look into EnvironmentEdge.currentTimeMillis
- I understand what you are saying about currentTimeMillis, but let me try to restate what
you said so that I am sure that we are on the same page:

If I move the call to currentTimeMillis inside the while loop, that means that I will have
to keep another variable off to the side to keep track of the total, plus another one to accomplish
the swap.  Doing this, I would call currentTimeMillis once for each time through the loop,
correct?  If you think that is a better way to go, I can do that.


                
> 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
>
>
> 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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