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From "Anastasia Braginsky (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14921) Memory optimizations
Date Mon, 25 Jul 2016 20:02:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15392571#comment-15392571
] 

Anastasia Braginsky commented on HBASE-14921:
---------------------------------------------

First, I agree that the sizing issue is ugly and need to be improved. Which is partially done
in this patch and I planned to improve it further. 

However, I think it is unnecessary and not urgent, to open another JIRA for this fix. This
is not an issue of rebase only, because we take the code in two different directions. We could
live with the code as is (or at least could see the final outcome of 14921) and later we could
agree how to arrange the sizes (if what we have is not good enough)... 

Your two concerns are very clear.
1. The flattening without compaction is causing many small segments in pipeline, and they
are not flushed all together.
2. The issue of compaction prediction cost.

Please correct me if I am wrong.

We understand those concerns. There is no argument that your first concern will be fixed.
For your second concern we are going to benchmark it ourselves with PE.

> 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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