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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14921) Memory optimizations
Date Wed, 17 Aug 2016 16:49:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15424881#comment-15424881
] 

Lars Hofhansl commented on HBASE-14921:
---------------------------------------

MSLAB forces another copy of the data backing each Cell coming in, consuming memory bandwidth.
With G1GC that does not appear to be necessary, since G1 manages small'ish memory regions
anyway.

I will repeat what I always say: Let's not try to be smarter than the garbage collector. Chances
are we're not :)


> 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, HBASE-14921-V08-CAO.patch,
HBASE-14921-V09-CAO.patch, HBASE-14921-V10-CAO.patch, HBASE-14921-V11-CAO.patch, HBASE-14921-V11-CAO.patch,
InitialCellArrayMapEvaluation.pdf, IntroductiontoNewFlatandCompactMemStore.pdf, MemStoreSizes.pdf,
MemstoreItrCountissue.patch, NewCompactingMemStoreFlow.pptx
>
>
> Memory optimizations including compressed format representation and offheap allocations



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