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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14921) Memory optimizations
Date Thu, 21 Jul 2016 05:53:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15387214#comment-15387214
] 

Anoop Sam John commented on HBASE-14921:
----------------------------------------

[~anastas]  So you got the comment abt the heap sizing for the CellArrayEntry ?  I mean to
say here just consider the extra heap space need for adding an item to this CellArray structure.
 Do not consider the heap need for that object as such. That can be done within that object's
heap size calc.
Finally when we have to find whole heap size of a given CellArray structure we can 
<Cell Array  Object overhead> + 
for(Each entry in CellArray)
   CellArray Entry overhead + Cell object heap

> 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, HBASE-14921-V02.patch, HBASE-14921-V03.patch, HBASE-14921-V04-CA-V02.patch,
HBASE-14921-V04-CA.patch, HBASE-14921-V05-CAO.patch, HBASE-14921-V06-CAO.patch, InitialCellArrayMapEvaluation.pdf,
IntroductiontoNewFlatandCompactMemStore.pdf
>
>
> Memory optimizations including compressed format representation and offheap allocations



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