[jira] [Commented] (HIVE-8943) Fix memory limit check for combine nested mapjoins [Spark Branch]

["Xuefu Zhang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-8943?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14229387#comment-14229387 ] 

Xuefu Zhang commented on HIVE-8943:
-----------------------------------

Thanks, Szehon! I'm reviewing it now.

> Fix memory limit check for combine nested mapjoins [Spark Branch]
> -----------------------------------------------------------------
>
>                 Key: HIVE-8943
>                 URL: https://issues.apache.org/jira/browse/HIVE-8943
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Spark
>    Affects Versions: spark-branch
>            Reporter: Szehon Ho
>            Assignee: Szehon Ho
>         Attachments: HIVE-8943.1-spark.patch, HIVE-8943.1-spark.patch, HIVE-8943.2-spark.patch, HIVE-8943.3-spark.patch
>
>
> Its the opposite problem of what we thought in HIVE-8701.
> SparkMapJoinOptimizer does combine nested mapjoins into one work due to removal of RS for big-table.  So we need to enhance the check to calculate if all the MapJoins in that work (spark-stage) will fit into the memory, otherwise it might overwhelm memory for that particular spark executor.



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