[jira] Commented: (HBASE-74) [performance] When a get or scan request spans multiple columns, execute the reads in parallel

["Zlatin Balevsky (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-74?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12796432#action_12796432 ] 

Zlatin Balevsky commented on HBASE-74:
--------------------------------------

> HRegionServer: Every get can be done in parallel.
> HRegion : Every family in the get can be done in parallel
> HStore : Every read from memCache + storefiles can be done in parallel.

Since HBASE-1935 is addressing paralellism at HRegionServer level, is this issue going to tackle both HRegion and HStore levels?   

> [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: Hadoop HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: Jim Kellerman
>            Assignee: stack
>            Priority: Critical
>             Fix For: 0.21.0
>
>
> 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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