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From "Eshcar Hillel (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16417) In-Memory MemStore Policy for Flattening and Compactions
Date Mon, 20 Mar 2017 10:13:41 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15932430#comment-15932430
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Eshcar Hillel commented on HBASE-16417:
---------------------------------------

I can use the code of HBASE-17655 to run the mixed workload benchmark to see if parallel seek
fixes the high percentiles degradation.
However as I understand the code despite the fact that parallelSeekEnabled is set to true
when StoreScanner is created, since
isLazy = explicitColumnQuery && lazySeekEnabledGlobally
and since lazySeekEnabledGlobally is set to true by default and
explicitColumnQuery is set to numCol > 0  which is true in our case (I think it is always
true) then parallelSeek() is never invoked.
Am I missing anything? What was the original intention -- when would we not want to run parallel
seek?   


> 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,
HBASE-16417-benchmarkresults-20161123.pdf, HBASE-16417-benchmarkresults-20161205.pdf, HBASE-16417-benchmarkresults-20170309.pdf,
HBASE-16417-benchmarkresults-20170317.pdf
>
>




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