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https://issues.apache.org/jira/browse/PHOENIX-3536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15866342#comment-15866342
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James Taylor commented on PHOENIX-3536:
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Thanks for the patch, [~Jeongdae Kim]. What kind of impact does this have on
performance? [~sergey.soldatov] - would it be possible for you to review this?
[~Jeongdae Kim] - this might need to be rebased after PHOENIX-3346 is committed.
> 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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