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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16417) In-Memory MemStore Policy for Flattening and Compactions
Date Mon, 14 Nov 2016 04:32:58 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15662731#comment-15662731
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ramkrishna.s.vasudevan commented on HBASE-16417:
------------------------------------------------

ACtually we had a discussion around this. But as Anoop said we cannot go with first memstore
and then HFiles as per the reasons stated above. 
For a given row - if there are 100 qualifiers (single CF), you could add them in 100 different
puts one by one. 
So in this case when we say get that row - we are not sure if by this time if any flush had
happened moving some of the qualifiers to the file. 
The InternalScan is not exposed but if you want a behaviour where you are sure that you do
frequent updates and fetch only the recent one (the catch is that if the recent is not in
memstore - you won't get any result) then we may have to expose readOnlyMemstore type of API
in scan. But am not sure how beneficial it i will be where there are more chances for missing
results.

> In-Memory MemStore Policy for Flattening and Compactions
> --------------------------------------------------------
>
>                 Key: HBASE-16417
>                 URL: https://issues.apache.org/jira/browse/HBASE-16417
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Anastasia Braginsky
>            Assignee: Eshcar Hillel
>             Fix For: 2.0.0
>
>         Attachments: HBASE-16417-benchmarkresults-20161101.pdf, HBASE-16417-benchmarkresults-20161110.pdf
>
>




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