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From "Eshcar Hillel (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-15016) StoreServices facility in Region
Date Thu, 31 Dec 2015 11:36:49 GMT

     [ https://issues.apache.org/jira/browse/HBASE-15016?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eshcar Hillel updated HBASE-15016:
----------------------------------
    Attachment: Regioncounters.pdf

The attached file (Region counters) show a view of the region counters before and after the
patch, and can help understand how they affect the flush decisions. 

> 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
>
>
> 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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