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Date: Wed, 13 Aug 2014 03:19:12 +0000 (UTC)
From: "Brock Noland (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Message-ID: <JIRA.12732505.1407401729413.69504.1407899952259@arcas>
In-Reply-To: <JIRA.12732505.1407401729413@arcas>
References: <JIRA.12732505.1407401729413@arcas>
Subject: [jira] [Commented] (HIVE-7643) ExecMapper static states lead to
 unpredictable query result.[Spark Branch]
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    [ https://issues.apache.org/jira/browse/HIVE-7643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14095094#comment-14095094 ] 

Brock Noland commented on HIVE-7643:
------------------------------------

My mistake.  I will fix the build. 

> 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
>
>
> 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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