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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16417) In-Memory MemStore Policy for Flattening and Compactions
Date Wed, 31 Aug 2016 05:51:21 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15451242#comment-15451242
] 

Anoop Sam John commented on HBASE-16417:
----------------------------------------

No , what she says is this compaction of segments in pipeline (into one segment) will not
include the Cell data copy.  (this might be happening as of now, but will get rid of that).
 Ya this is kind of compaction.  The real compaction will involve scanning all segments and
that might remove deleted/version expired cells. Here there will be a fresh copy of the cell
data to new MSLAB chunks.  But  the other simple compaction won't do this MSLAB extra copy.
That will consider all cells also. (just an iterator no StoreScanner. correct Anastatia?)
 So this op aim is to reduce the #segments in pipeline in order to reduce the impact this
might have on reads (scan)

> In-Memory MemStore Policy for Flattening and Compactions
> --------------------------------------------------------
>
>                 Key: HBASE-16417
>                 URL: https://issues.apache.org/jira/browse/HBASE-16417
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Anastasia Braginsky
>            Assignee: Anastasia Braginsky
>




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