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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-14921) Memory optimizations
Date Tue, 02 Aug 2016 06:18:20 GMT

     [ https://issues.apache.org/jira/browse/HBASE-14921?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

ramkrishna.s.vasudevan updated HBASE-14921:
-------------------------------------------
    Attachment: MemstoreItrCountissue.patch

Attaching a simple UT. I have added two test cases. One where we do in memory flush and then
do a memstore scan. Here we get the exact count.
Next is with MemstoreITerator we do a count. (As it is in MemstoreCompactor). Here the count
is much lesser and exposes the bug.
Note that even in the case where we do scan the flushInMemory does a compaction which ideally
should have been avoided if the count had worked correctly.

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



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