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Posted to dev@hbase.apache.org by "Jean-Daniel Cryans (JIRA)" <ji...@apache.org> on 2010/01/20 20:38:54 UTC

[jira] Updated: (HBASE-2149) hbase.regionserver.global.memstore.lowerLimit is too low

     [ https://issues.apache.org/jira/browse/HBASE-2149?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jean-Daniel Cryans updated HBASE-2149:
--------------------------------------

    Summary: hbase.regionserver.global.memstore.lowerLimit is too low  (was: hbase.regionserver.global.memstore.lowerLimit is too high)

> 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 worse.
> 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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