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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2149) hbase.regionserver.global.memstore.lowerLimit is too low
Date Wed, 20 Jan 2010 20:35:56 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12802977#action_12802977

Jean-Daniel Cryans commented on HBASE-2149:

I agree with Ryan. Could the MemStoreFlusher also check the state of the global size (if higher
than the lower bound) when it doesn't have any region to flush?

> hbase.regionserver.global.memstore.lowerLimit is too low
> --------------------------------------------------------
>                 Key: HBASE-2149
>                 URL: https://issues.apache.org/jira/browse/HBASE-2149
>             Project: Hadoop HBase
>          Issue Type: Bug
>            Reporter: Jean-Daniel Cryans
>            Assignee: Jean-Daniel Cryans
>             Fix For: 0.20.4, 0.21.0
> The default value of hbase.regionserver.global.memstore.lowerLimit of 25% is very wrong
and in almost all cases was problematic (I've seen this in at least 3 occurrences). The cost
of flushing a memstore is fairly high and when the global size reaches 40% then ALL inserts
are blocked. This means that with a heap of 1GB you could be flushing for 10-20 seconds or
> I suggest a default setting of 38% or even 40% so that only a region or two will be flushed
(the biggest ones) for maximum availability.

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