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https://issues.apache.org/jira/browse/HBASE-18294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16351714#comment-16351714
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Edward Bortnikov commented on HBASE-18294:
------------------------------------------

I second [~eshcar]. Off-heap and on-heap memory are different resources, with 
potentially very different allocations within the same machine. The code 
already addresses them separately all the way long. The user does need this 
(optional) design knob.  

> Reduce global heap pressure: flush based on heap occupancy
> ----------------------------------------------------------
>
>                 Key: HBASE-18294
>                 URL: https://issues.apache.org/jira/browse/HBASE-18294
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 3.0.0
>            Reporter: Eshcar Hillel
>            Assignee: Eshcar Hillel
>            Priority: Major
>             Fix For: 2.0.0-beta-2
>
>         Attachments: HBASE-18294.01.patch, HBASE-18294.01.patch, 
> HBASE-18294.01.patch, HBASE-18294.01.patch, HBASE-18294.02.patch, 
> HBASE-18294.03.patch, HBASE-18294.04.patch, HBASE-18294.05.patch, 
> HBASE-18294.06.patch, HBASE-18294.07.patch, HBASE-18294.07.patch, 
> HBASE-18294.08.patch, HBASE-18294.09.patch, HBASE-18294.10.patch, 
> HBASE-18294.11.patch, HBASE-18294.11.patch, HBASE-18294.12.patch, 
> HBASE-18294.13.patch, HBASE-18294.15.patch, HBASE-18294.16.patch, 
> HBASE-18294.master.01.patch
>
>
> A region is flushed if its memory component exceed a threshold (default size 
> is 128MB).
> A flush policy decides whether to flush a store by comparing the size of the 
> store to another threshold (that can be configured with 
> hbase.hregion.percolumnfamilyflush.size.lower.bound).
> Currently the implementation (in both cases) compares the data size 
> (key-value only) to the threshold where it should compare the heap size 
> (which includes index size, and metadata).



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