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https://issues.apache.org/jira/browse/HBASE-14921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15420787#comment-15420787
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Anastasia Braginsky commented on HBASE-14921:
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Hi Guys!
I have published the patch that measures how long it takes to do the
speculative scan. It appears we can not run PE and we try to evaluate using
YCSB. On YCSB we see no performance impact due to the compaction-evaluation
scan. The scan per store takes in average 280 milliseconds and happens in
average every 3.5 minutes. Can you please run this patch with your PE and tell
us what you see?
> 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, HBASE-14921-V08-CAO.patch,
> HBASE-14921-V09-CAO.patch, HBASE-14921-V10-CAO.patch,
> InitialCellArrayMapEvaluation.pdf,
> IntroductiontoNewFlatandCompactMemStore.pdf, MemStoreSizes.pdf,
> MemstoreItrCountissue.patch, NewCompactingMemStoreFlow.pptx
>
>
> Memory optimizations including compressed format representation and offheap
> allocations
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