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From "Anastasia Braginsky (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-19133) Transfer big cells or upserted/appended cells into MSLAB upon flattening to CellChunkMap
Date Sun, 04 Feb 2018 12:56:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-19133?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16351772#comment-16351772

Anastasia Braginsky commented on HBASE-19133:

There going to be a new JIRA where the fix is going to be described. In short, as I said,
in ImmutableMemStoreLAB while forceCloneOfBigCell() is requested, forceCloneOfBigCell()
is going to proceed with forceCloneOfBigCell() performed on the first MSLABImpl in the linked
{quote}Are you going to change the type of segment merge operation produces ?

> Transfer big cells or upserted/appended cells into MSLAB upon flattening to CellChunkMap
> ----------------------------------------------------------------------------------------
>                 Key: HBASE-19133
>                 URL: https://issues.apache.org/jira/browse/HBASE-19133
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Anastasia Braginsky
>            Assignee: Gali Sheffi
>            Priority: Major
>             Fix For: 2.0.0-beta-1
>         Attachments: HBASE-19133-V01.patch, HBASE-19133-V02.patch, HBASE-19133-V03.patch,
HBASE-19133.01.patch, HBASE-19133.02.patch, HBASE-19133.03.patch, HBASE-19133.04.patch, HBASE-19133.05.patch,
HBASE-19133.06.patch, HBASE-19133.07.patch, HBASE-19133.08.patch, HBASE-19133.09.patch, HBASE-19133.10.patch,
> CellChunkMap Segment index requires all cell data to be written in the MSLAB Chunks.
Eventhough MSLAB is enabled, cells bigger than chunk size or upserted/incremented/appended
cells are still allocated on the JVM stack. If such cells are found in the process of flattening
into CellChunkMap (in-memory-flush) they need to be copied into MSLAB.

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