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Date: Wed, 26 Apr 2017 11:49:04 +0000 (UTC)
From: "Anoop Sam John (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HBASE-17343) Make Compacting Memstore default
 in 2.0 with BASIC as the default type
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archived-at: Wed, 26 Apr 2017 11:49:10 -0000


    [ https://issues.apache.org/jira/browse/HBASE-17343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15984635#comment-15984635 ] 

Anoop Sam John commented on HBASE-17343:
----------------------------------------

What  I think is as below.. (Did not test and investigated thoroughly though.  I have to do that.. Just as a test way did)
We have a global memstore size above which we dont allow sum of all memstore's size to grow.. Once we reach we block the writes and make forced flushes.  Even at a lower barrier breach, we take action.
Here while we change the CSLM to CellArray, we have a size increase (temp) and we dont account that any where..  We were already nearing to the global memstore limit but and this change would have breached it , blocking further writes and making forced flushes. (If we accounted that)..  The IHOP is so adjusted considering the global memstore size been 60%.  May be like the heap usage by memstores grow (this is memory which we can not release) above 60% .. The change might be giving a breathing space as we do some forced flushes.   Again just theory..  Need to do further investigation.

Again this is an issue when we deal with low cell size and higher memstore size (MSLAB and it is pool).

> Make Compacting Memstore default in 2.0 with BASIC as the default type
> ----------------------------------------------------------------------
>
>                 Key: HBASE-17343
>                 URL: https://issues.apache.org/jira/browse/HBASE-17343
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 2.0.0
>            Reporter: ramkrishna.s.vasudevan
>            Priority: Blocker
>             Fix For: 2.0.0
>
>         Attachments: HBASE-17343-V01.patch, HBASE-17343-V02.patch, HBASE-17343-V04.patch, HBASE-17343-V05.patch
>
>
> FYI [~anastas], [~eshcar] and [~ebortnik].


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