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From "Pengcheng Xiong (JIRA)" <>
Subject [jira] [Commented] (HIVE-14890) remove stat task generation from GenMapRedUtils.isMergeRequired
Date Wed, 05 Oct 2016 04:04:20 GMT


Pengcheng Xiong commented on HIVE-14890:

[~sershe], could u be more specific about the problem? isMergeRequired was first introduced
commit 1fcfc31ea5c23aec3f3bf610e8938804a750ee5d
Author: Gunther Hagleitner <>
Date:   Mon Nov 4 01:34:01 2013 +0000

    HIVE-5734: Enable merge/move tasks for Tez (Gunther Hagleitner)

    git-svn-id: 13f79535-47bb-0310-9956-ffa450edef68

> remove stat task generation from GenMapRedUtils.isMergeRequired
> ---------------------------------------------------------------
>                 Key: HIVE-14890
>                 URL:
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Sergey Shelukhin
>            Assignee: Pengcheng Xiong
>            Priority: Minor
> GenMapRedUtils.isMergeRequired method should not generate stats task... This kind of
pattern causes bugs that we have seen before when a change to a feature (e.g. merge in this
case - for example if on some paths isMergeRequired is not called, which would be a valid
change) would break a completely unrelated feature for no clear reason.

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