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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16421) Introducing the CellChunkMap as a new additional index variant in the MemStore
Date Wed, 28 Dec 2016 06:09:58 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15782176#comment-15782176

ramkrishna.s.vasudevan commented on HBASE-16421:

bq. I assume that in all experiments (except DefaultMemStore) you had MSLAB and Chunk Pool
bq.What is the "total time" that you are presenting? Total time of the experiment? Isn’t
it 16 minutes?
Yes it is 16 mins
bq.You can get specifically the scan latency from YCSB.
This does not complete as I said. Because every scan is a full scan from the randomly selected
start row. I may have to reduce the record count and the operation count may be - to complete
this experiment.
Also since we don't know if the scan comes from memstore or files - how to ensure that the
garbage gnerated on a memstore scan reduces/increases performance ?  I don't think that is
possible unless we have the memstore first Scan approach. 
bq.Anyway, we can say that CellChunkMap is not decreasing the performance too much, and it
worth it at least as off-heaping worth it. Do you agree?
Yes I think so. But let us wait for some more feedback or cases that I may be missing. More
tests can be done from beginning of next week.

> Introducing the CellChunkMap as a new additional index variant in the MemStore
> ------------------------------------------------------------------------------
>                 Key: HBASE-16421
>                 URL: https://issues.apache.org/jira/browse/HBASE-16421
>             Project: HBase
>          Issue Type: Umbrella
>            Reporter: Anastasia Braginsky
>         Attachments: CellChunkMapRevived.pdf, ChunkCell_creation.png, IntroductiontoNewFlatandCompactMemStore.pdf
> Follow up for HBASE-14921. This is going to be the umbrella JIRA to include all the parts
of integration of the CellChunkMap to the MemStore.

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