Jean-Marc Spaggiari created HBASE-15625:
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Summary: Make minimum values configurable and smaller
Key: HBASE-15625
URL: https://issues.apache.org/jira/browse/HBASE-15625
Project: HBase
Issue Type: Bug
Affects Versions: 1.2.0
Reporter: Jean-Marc Spaggiari
Priority: Minor
When we start a RS, we check HConstants.HBASE_CLUSTER_MINIMUM_MEMORY_THRESHOLD
to make sure we always keep 20% of the heap for HBase (See below). In the past
maximum heap size was about 20GB, which means 4GB for HBase.
Today, with huge heaps and GC1, 20% gives a lot to HBase. Like with 80GB heap,
it gives 16GB, which I think it not required.
We need to make HBASE_CLUSTER_MINIMUM_MEMORY_THRESHOLD configurable and lower
it's default value to 10%. It will not make any difference on any HBase
configuration but will allow admins to be more flexible.
Same thing for the minimum memstore and blockcache sizes.
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