[jira] [Resolved] (HBASE-15625) Make minimum values configurable and smaller

["Andrew Kyle Purtell (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-15625?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Kyle Purtell resolved HBASE-15625.
-----------------------------------------
      Assignee:     (was: Konstantin Ryakhovskiy)
    Resolution: Invalid

> 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
>              Labels: beginner
>
> 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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