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From "Anastasia Braginsky (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14921) Memory optimizations
Date Mon, 15 Aug 2016 09:36:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15420787#comment-15420787
] 

Anastasia Braginsky commented on HBASE-14921:
---------------------------------------------

Hi Guys!

I have published the patch that measures how long it takes to do the speculative scan. It
appears we can not run PE and we try to evaluate using YCSB. On YCSB we see no performance
impact due to the compaction-evaluation scan. The scan per store takes in average 280 milliseconds
and happens in average every 3.5 minutes.  Can you please run this patch with your PE and
tell us what you see?

> 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, InitialCellArrayMapEvaluation.pdf, IntroductiontoNewFlatandCompactMemStore.pdf,
MemStoreSizes.pdf, MemstoreItrCountissue.patch, NewCompactingMemStoreFlow.pptx
>
>
> Memory optimizations including compressed format representation and offheap allocations



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