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Posted to issues@hbase.apache.org by "Hadoop QA (Commented) (JIRA)" <ji...@apache.org> on 2011/11/01 09:10:33 UTC
[jira] [Commented] (HBASE-3680) Publish more metrics about mslab
[ https://issues.apache.org/jira/browse/HBASE-3680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13141014#comment-13141014 ]
Hadoop QA commented on HBASE-3680:
----------------------------------
-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12501741/hbase-3680.txt
against trunk revision .
+1 @author. The patch does not contain any @author tags.
+1 tests included. The patch appears to include 3 new or modified tests.
-1 patch. The patch command could not apply the patch.
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/120//console
This message is automatically generated.
> Publish more metrics about mslab
> --------------------------------
>
> Key: HBASE-3680
> URL: https://issues.apache.org/jira/browse/HBASE-3680
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 0.90.1
> Reporter: Jean-Daniel Cryans
> Assignee: Todd Lipcon
> Fix For: 0.92.0
>
> Attachments: hbase-3680.txt, hbase-3680.txt
>
>
> We have been using mslab on all our clusters for a while now and it seems it tends to OOME or send us into GC loops of death a lot more than it used to. For example, one RS with mslab enabled and 7GB of heap died out of OOME this afternoon; it had .55GB in the block cache and 2.03GB in the memstores which doesn't account for much... but it could be that because of mslab a lot of space was lost in those incomplete 2MB blocks and without metrics we can't really tell. Compactions were running at the time of the OOME and I see block cache activity. The average load on that cluster is 531.
> We should at least publish the total size of all those blocks and maybe even take actions based on that (like force flushing).
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