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https://issues.apache.org/jira/browse/HBASE-14921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15393193#comment-15393193
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Anoop Sam John commented on HBASE-14921:
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Ya [~anastas] the 2 points I raised are those.. I wanted to make sure those
are highlighted early rather than saying it after.. And I dont mean they
should be addressed in a single jira. Ya this is already big patch and no need
to do more work again.. That is the common practice we follow.. When a comment
needs more work, the developer can suggest doing it later as part of another
jira and reviewers mostly agree. I am fine for that.. Sorry if I was not
saying it explicitly. It is a practice for us so I missed. Sorry.
It is your wish.. In this form also am ok to get that in.. We can always make
things better after.
The cost of scan may be more when we have CellChunkMap.. In this flattened
form, we get rid of Cell objects and again this Scan will make these objects
over us. With CellArrayMap the overhead might be from SQM and StoreScanner
heap. With CellChunkMap it is more.. That is why I raised it early. Ya let us
do that later also. Its ok.
> 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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