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https://issues.apache.org/jira/browse/HIVE-25836?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yao Guangdong updated HIVE-25836:
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Summary: Tez union all operation may cause duplicate data (was: Tez union
operation may cause duplicate data)
> Tez union all operation may cause duplicate data
> ------------------------------------------------
>
> Key: HIVE-25836
> URL: https://issues.apache.org/jira/browse/HIVE-25836
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Affects Versions: 2.3.0, 2.3.8
> Reporter: Yao Guangdong
> Priority: Critical
>
> When we use tez union all operation.Which will cause some duplicate data in
> some cases. Which is because tez union all operation can generate sub
> directory in the table or parition directory.The sub directory use number as
> name and the result data file will stored in sub directory.If the sub
> directory have the speculate task execute and the speculate task's result
> file also in the sub directory.The hive client will delete duplicate task's
> file when the job finished.The hive client only check one level have the
> duplicate task's file.Because the sub directory's exsist. Which make the sub
> directory's duplicate task's file not delete and the duplicate data happened.
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