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https://issues.apache.org/jira/browse/HBASE-10713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13989385#comment-13989385
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Anoop Sam John commented on HBASE-10713:
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Working on this.  
A WIP patch is available at my hbase fork git
https://github.com/anoopsjohn/hbase/commit/36124709ff07ee826403d6cbd9f0fc604abe57d6

> A MemStore implementation with in memory flushes to CellBlocks
> --------------------------------------------------------------
>
>                 Key: HBASE-10713
>                 URL: https://issues.apache.org/jira/browse/HBASE-10713
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Anoop Sam John
>            Assignee: Anoop Sam John
>             Fix For: 0.99.0
>
>
> After HBASE-10648 we can plugin any implementation for MemStore. This issue 
> aims at coming up with an implementation, in which we will have in between in 
> memory flushes. This will reduce the need to keep lots of KVs in heap as well 
> as in CSLM.  CSLM perform poor when no# items in it increases.  We can keep 
> create CellBlocks (contigous byte[] like HFile block) out of KVs and keep it 
> as one object rather than many KVs.  At some point in time, MemStore might 
> have N CellBlocks and one CSLM.  
> These in memory CellBlocks can be compacted to one bigger block in between. 
> We can target that in follow on tasks once the basic code is ready.



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