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https://issues.apache.org/jira/browse/HIVE-8943?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14232387#comment-14232387
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Xuefu Zhang commented on HIVE-8943:
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qq: Do we need to list the two new test cases in testconfiguration.properties?
> 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, HIVE-8943.4-spark.patch,
> HIVE-8943.5-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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