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From "Prasanth Jayachandran (JIRA)" <>
Subject [jira] [Created] (HIVE-9529) "alter table .. concatenate" under Tez mode should create TezTask
Date Sat, 31 Jan 2015 01:58:34 GMT
Prasanth Jayachandran created HIVE-9529:

             Summary: "alter table .. concatenate" under Tez mode should create TezTask
                 Key: HIVE-9529
             Project: Hive
          Issue Type: Bug
    Affects Versions: 1.0.0, 1.2.0, 1.1.0
            Reporter: Prasanth Jayachandran
            Assignee: Prasanth Jayachandran

"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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