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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5002) AM could potentially allocate a reduce container to a map attempt
Date Thu, 17 Sep 2015 20:44:05 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14804466#comment-14804466
] 

Hudson commented on MAPREDUCE-5002:
-----------------------------------

FAILURE: Integrated in Hadoop-Yarn-trunk #1143 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/1143/])
MAPREDUCE-5002. AM could potentially allocate a reduce container to a map attempt. Contributed
by Chang Li (jlowe: rev 3f82f582e51c514cc0f052c828c2f58c6e8927ad)
* hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/rm/RMContainerAllocator.java
* hadoop-mapreduce-project/CHANGES.txt
* hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/v2/app/rm/TestRMContainerAllocator.java


> AM could potentially allocate a reduce container to a map attempt
> -----------------------------------------------------------------
>
>                 Key: MAPREDUCE-5002
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5002
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mr-am
>    Affects Versions: 2.0.3-alpha, 0.23.7, 2.7.0
>            Reporter: Jason Lowe
>            Assignee: Chang Li
>             Fix For: 2.8.0
>
>         Attachments: MAPREDUCE-5002.1.patch, MAPREDUCE-5002.2.patch, MAPREDUCE-5002.2.patch,
MAPREDUCE-5002.3.patch, MAPREDUCE-5002.4.patch, MAPREDUCE-5002.5.patch, MAPREDUCE-5002.6.patch
>
>
> As discussed in MAPREDUCE-4982, after MAPREDUCE-4893 it is theoretically possible for
the AM to accidentally assign a reducer container to a map attempt if the AM doesn't find
a reduce attempt actively looking for the container (e.g.: the RM accidentally allocated too
many reducer containers).



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