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From "Ning Zhang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-790) race condition related to ScriptOperator + UnionOperator
Date Tue, 25 Aug 2009 22:02:59 GMT

    [ https://issues.apache.org/jira/browse/HIVE-790?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12747681#action_12747681
] 

Ning Zhang commented on HIVE-790:
---------------------------------

Found out the reason for bug2: nzhang_tt is stored as RCFile and it turns out to be a bug
in RCFile rather than UNION all. Will file a bug for RCFile. Bug1 and the original bug is
still caused by multi-threading. 

> 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
>
> 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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