hbase.regionserver.global.memstore.lowerLimit is too high
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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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