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Posted to dev@phoenix.apache.org by "Jeongdae Kim (JIRA)" <ji...@apache.org> on 2017/02/14 02:24:41 UTC

[jira] [Commented] (PHOENIX-3536) Remove creating unnecessary phoenix connections in MR Tasks of Hive

    [ https://issues.apache.org/jira/browse/PHOENIX-3536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15864901#comment-15864901 ] 

Jeongdae Kim commented on PHOENIX-3536:
---------------------------------------

failed tests are not related to this patch. could anyone give me reviews for this patch?

> Remove creating unnecessary phoenix connections in MR Tasks of Hive
> -------------------------------------------------------------------
>
>                 Key: PHOENIX-3536
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-3536
>             Project: Phoenix
>          Issue Type: Improvement
>            Reporter: Jeongdae Kim
>            Assignee: Jeongdae Kim
>              Labels: HivePhoenix
>         Attachments: PHOENIX-3536.1.patch
>
>
> PhoenixStorageHandler creates phoenix connections to make QueryPlan in getSplit phase(prepare MR) and getRecordReader phase(Map) while running MR Job.
> in phoenix, it spends too many times to create the first phoenix connection(QueryServices) for specific URL. (checking and loading phoenix schema information)
> i found it is possible to remove creating query plan again in Map phase(getRecordReader()) by serializing QueryPlan created from Input format ans passing this plan to record reader. 
>  this approach improves scan performance by removing trying to unnecessary connection in map phase.



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