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https://issues.apache.org/jira/browse/HBASE-15016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15157371#comment-15157371
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stack commented on HBASE-15016:
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bq. I hope I am not missing anything.
You are not missing something. It just changed. That might be why you are
confused. Now when a Cell is stamped into the MemStore, it has a sequenceid.
This change came in with HBASE-12751 and then finished by HBASE-15158.
bq. I prefer not to add the 4th interface and instead use composition for
RegionServicesForStores.
You have a point. Do as you have it in your last patch [~eshcar]
> 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, HBASE-15016-V04.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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