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https://issues.apache.org/jira/browse/HIVE-790?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ning Zhang updated HIVE-790:
----------------------------
Attachment: Hive-790_4.patch
Attached a new patch Hive-790_4.patch that solves some other issues when
running unit tests. One issue is found that some operators are are called
close(). This may cause problem for union_all operator that assumes all parents
should be closed before it can close.
Also change the Operator.close() to be a generic close function for all
operators. Other operators that inherent it shouldn't reimplement the logic
over and over again. If they have special clean up to do, include it in
closeOp() which can be override from Operator..
> 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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