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From "Lars George (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-74) [performance] When a get or scan request spans multiple columns, execute the reads in parallel
Date Mon, 07 Feb 2011 07:18:30 GMT

    [ https://issues.apache.org/jira/browse/HBASE-74?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12991290#comment-12991290
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Lars George commented on HBASE-74:
----------------------------------

Stack,

{quote}
> HStore : Every read from memCache + storefiles can be done in parallel.
{quote}

How is that going to work with the ScanQueryMatcher? I mean, the initial seek() I can understand,
but then you have to scan the stores by age starting with the MemStore, moving to the on-disk
Stores. How can we parallelize that? Just curious.

> [performance] When a get or scan request spans multiple columns, execute the reads in
parallel
> ----------------------------------------------------------------------------------------------
>
>                 Key: HBASE-74
>                 URL: https://issues.apache.org/jira/browse/HBASE-74
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: Jim Kellerman
>            Priority: Critical
>             Fix For: 0.92.0
>
>
> When a get or scan request spans multiple columns, execute the reads in parallel and
use a CountDownLatch to wait for them to complete before returning the results.

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