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