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https://issues.apache.org/jira/browse/HIVE-7643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14095743#comment-14095743
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Brock Noland commented on HIVE-7643:
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+1
> ExecMapper static states lead to unpredictable query result.[Spark Branch]
> --------------------------------------------------------------------------
>
> Key: HIVE-7643
> URL: https://issues.apache.org/jira/browse/HIVE-7643
> Project: Hive
> Issue Type: Bug
> Components: Spark
> Reporter: Chengxiang Li
> Assignee: Chengxiang Li
> Attachments: HIVE-7643.1-spark.patch, HIVE-7643.2-spark.patch,
> HIVE-7643.2-spark.patch
>
>
> ExecMapper contain static states, static variable "done" for example. Spark
> executor may execute multi tasks concurrently, ExecMapper static state
> updated by one task would influence the logic of another task, which may lead
> to unpredictable result. To reproduce, execute
> {code:sql}
> SELECT COUNT(*) FROM TEST TABLESAMPLE(1 ROWS) s
> {code},
> TEST should be a table with several blocks source data.
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