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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14921) Memory optimizations
Date Mon, 21 Mar 2016 11:13:25 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15204041#comment-15204041
] 

ramkrishna.s.vasudevan commented on HBASE-14921:
------------------------------------------------

Went thro the patch. 
The chunk pool is currently configurable but the main idea to design it was to avoid memstore
fragmentation.  Currently in our related work with offheap writes we are trying to enable
chunk pool always. 
In the patch any specific reason to name CellBlockOffheapSegment with  'offheap'?  There is
nothing offheap now in that. But I think you made the representation of the chunks array based
so that you can do binary search which is good. 



> Memory optimizations
> --------------------
>
>                 Key: HBASE-14921
>                 URL: https://issues.apache.org/jira/browse/HBASE-14921
>             Project: HBase
>          Issue Type: Sub-task
>    Affects Versions: 2.0.0
>            Reporter: Eshcar Hillel
>            Assignee: Anastasia Braginsky
>         Attachments: CellBlocksSegmentInMemStore.pdf, CellBlocksSegmentinthecontextofMemStore(1).pdf,
HBASE-14921-V01.patch
>
>
> Memory optimizations including compressed format representation and offheap allocations



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