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https://issues.apache.org/jira/browse/HIVE-9529?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14299583#comment-14299583
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Prasanth Jayachandran commented on HIVE-9529:
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[~hagleitn]/[~vikram.dixit] Can someone take a look?
> "alter table .. concatenate" under Tez mode should create TezTask
> -----------------------------------------------------------------
>
> Key: HIVE-9529
> URL: https://issues.apache.org/jira/browse/HIVE-9529
> Project: Hive
> Issue Type: Bug
> Affects Versions: 1.0.0, 1.2.0, 1.1.0
> Reporter: Prasanth Jayachandran
> Assignee: Prasanth Jayachandran
> Attachments: HIVE-9529.1.patch
>
>
> "alter table .. concatenate" DDL command creates MR task by default. When
> hive cli is launched with execution engine as tez, the scheduling of the MR
> task for file merging could be delayed until tez session expiration. This
> happens because YARN will not have capacity to launch another AppMaster for
> MR task. We should create tez task to overcome this. When the execution
> engine is tez TezTask will be created else MRTask will be created.
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