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From "Edward Bortnikov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14921) Memory optimizations
Date Mon, 25 Jul 2016 21:05:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15392671#comment-15392671
] 

Edward Bortnikov commented on HBASE-14921:
------------------------------------------

Let me re-iterate we are respectful of everyone's contribution, and are trying to do the right
thing, as much by-consensus as possible. 

Here's a suggestion. For the sake of the current patch, let's decouple the in-memory flush
configuration from compaction configuration. The latter is a special case of the former. With
compaction protected by a explicit flag, we no more need the speculative scan to predict its
worthiness. The code becomes simple. In the future, we can discuss smart policies to help
us eliminate this flag. 

[~anastas] and [~anoop.hbase], can we agree on this as base for further discussion? 

> 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
>
>
> Memory optimizations including compressed format representation and offheap allocations



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