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https://issues.apache.org/jira/browse/HIVE-15682?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xuefu Zhang updated HIVE-15682:
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Attachment: HIVE-15682.patch
Patch here avoids per row based dummy iterator creation.
> Eliminate the dummy iterator and optimize the per row based reducer-side
> processing
> -----------------------------------------------------------------------------------
>
> Key: HIVE-15682
> URL: https://issues.apache.org/jira/browse/HIVE-15682
> Project: Hive
> Issue Type: Improvement
> Components: Spark
> Affects Versions: 2.2.0
> Reporter: Xuefu Zhang
> Assignee: Xuefu Zhang
> Attachments: HIVE-15682.patch
>
>
> HIVE-15580 introduced a dummy iterator per input row which can be eliminated.
> This is because {{SparkReduceRecordHandler}} is able to handle single key
> value pairs. We can refactor this part of code 1. to remove the need for a
> iterator and 2. to optimize the code path for per (key, value) based (instead
> of (key, value iterator)) processing. It would be also great if we can
> measure the performance after the optimizations and compare to performance
> prior to HIVE-15580.
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