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

["Sean Busbey (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-15625?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15821175#comment-15821175 ] 

Sean Busbey commented on HBASE-15625:
-------------------------------------

Reassigned to you [~ryakhovskiy.k]. Please attach a patch for master.

Also some quick feedback on the patch:

1) We'd really like to avoid more constants in HConstants, so if you could define these in a different place close to where they're used that'd be better.
2) HConstants is part of the public API and marked stable, so please make sure the name {{HConstants.HBASE_CLUSTER_MINIMUM_MEMORY_THRESHOLD}} still points to a float, and mark it deprecated so we can remove it in the future.

> 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
>            Assignee: Konstantin Ryakhovskiy
>            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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