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https://issues.apache.org/jira/browse/HIVE-10302?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xuefu Zhang updated HIVE-10302:
-------------------------------
Attachment: 10302.patch
Patch 10302 (without HIVE-) is the result of rebasing with latest master, which
is actually committed to master.
> Load small tables (for map join) in executor memory only once [Spark Branch]
> ----------------------------------------------------------------------------
>
> Key: HIVE-10302
> URL: https://issues.apache.org/jira/browse/HIVE-10302
> Project: Hive
> Issue Type: Improvement
> Reporter: Jimmy Xiang
> Assignee: Jimmy Xiang
> Fix For: spark-branch
>
> Attachments: 10302.patch, HIVE-10302.2-spark.patch,
> HIVE-10302.3-spark.patch, HIVE-10302.4-spark.patch, HIVE-10302.spark-1.patch
>
>
> Usually there are multiple cores in a Spark executor, and thus it's possible
> that multiple map-join tasks can be running in the same executor
> (concurrently or sequentially). Currently, each task will load its own copy
> of the small tables for map join into memory, ending up with inefficiency.
> Ideally, we only load the small tables once and share them among the tasks
> running in that executor.
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