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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-2149) hbase.regionserver.global.memstore.lowerLimit is too high
Date Wed, 20 Jan 2010 19:38:54 GMT
hbase.regionserver.global.memstore.lowerLimit is too high
---------------------------------------------------------

                 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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