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https://issues.apache.org/jira/browse/HBASE-15016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15086383#comment-15086383
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stack commented on HBASE-15016:
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Just saw the [~ebortnik] comment.
bq. That's why we think the existing region-store contract needs a little
extension.
I think we are past this point. Just trying to figure a bit of how (smile).
bq. Let's say every region has two memory areas - underflow and overflow.
This is Eshcar's active and fluctuating I believe.
[~eshcar] I don't see how Region is flagging the Store about low/high
threshold (or Edwards underflow/overflow) in your patch; there is just one
requestFlush happening in either case. In mine it is a TODO passed in on the
flush request... Pardon me if I'm not getting it.
> StoreServices facility in Region
> --------------------------------
>
> Key: HBASE-15016
> URL: https://issues.apache.org/jira/browse/HBASE-15016
> Project: HBase
> Issue Type: Sub-task
> Reporter: Eshcar Hillel
> Assignee: Eshcar Hillel
> Attachments: HBASE-15016-V01.patch, HBASE-15016-V02.patch,
> HBASE-15016-V03.patch, Regioncounters.pdf, suggestion.patch
>
>
> The default implementation of a memstore ensures that between two flushes the
> memstore size increases monotonically. Supporting new memstores that store
> data in different formats (specifically, compressed), or that allows to
> eliminate data redundancies in memory (e.g., via compaction), means that the
> size of the data stored in memory can decrease even between two flushes. This
> requires memstores to have access to facilities that manipulate region
> counters and synchronization.
> This subtasks introduces a new region interface -- StoreServices, through
> which store components can access these facilities.
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