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Date: Tue, 1 Sep 2009 09:30:32 -0700 (PDT)
From: "Namit Jain (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Subject: [jira] Reopened: (HIVE-790) race condition related to
 ScriptOperator + UnionOperator
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     [ https://issues.apache.org/jira/browse/HIVE-790?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Namit Jain reopened HIVE-790:
-----------------------------


need to fix for 0.4 also 

> race condition related to ScriptOperator + UnionOperator
> --------------------------------------------------------
>
>                 Key: HIVE-790
>                 URL: https://issues.apache.org/jira/browse/HIVE-790
>             Project: Hadoop Hive
>          Issue Type: Bug
>            Reporter: Zheng Shao
>            Assignee: Ning Zhang
>         Attachments: Hive-790.patch, Hive-790_2.patch, Hive-790_3.patch, Hive-790_4.patch
>
>
> ScriptOperator uses a second thread to output the rows to the children operators. In a corner case which contains a union, 2 threads might be outputting data into the same operator hierarchy and caused race conditions.
> {code}
> CREATE TABLE tablea (cola STRING);
> SELECT *
> FROM (
>     SELECT TRANSFORM(cola)
>     USING 'cat'
>     AS cola
>     FROM tablea
>   UNION ALL
>     SELECT cola as cola
>     FROM tablea
> ) a;
> {code}

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