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From "Sergey Soldatov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-3536) Remove creating unnecessary phoenix connections in MR Tasks of Hive
Date Wed, 22 Feb 2017 06:52:44 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-3536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15877603#comment-15877603
] 

Sergey Soldatov commented on PHOENIX-3536:
------------------------------------------

[~Jeongdae Kim] I have some concerns about the way how it's implemented. You have modified
the way how projected column expression is serialized and I have strong feeling that it may
break the backward compatibility between server and  older clients. We usually do such changes
in major releases. [~jamestaylor] WDYT?

> 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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