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https://issues.apache.org/jira/browse/HBASE-18294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16363444#comment-16363444
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Anoop Sam John commented on HBASE-18294:
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bq.If the offheap is 100x the onheap in size, and the threshold is set to
offheap (100x) + onheap (1x) – i.e. 101x – then what happens when the onheap
occupancy exceeds 1x?
This is about the per region flush decision boss. Correct me if wrong
[~eshcar]. Globally the decision should be with ||. We have barrier for off
heap and on heap memory and when any of the barrier is about to be crossed, it
will result in forced flushes.
> 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-18294.01.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, 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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