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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-2) Reused Keys and Values fail with a Combiner
Date Fri, 10 Oct 2014 01:52:33 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14166162#comment-14166162
] 

Hudson commented on HADOOP-2:
-----------------------------

FAILURE: Integrated in Ambari-trunk-Commit #533 (See [https://builds.apache.org/job/Ambari-trunk-Commit/533/])
AMBARI-7229. Stack version must start with 2. to be considered Hadoop-2.x compatible. (jaimin)
(jaimin: http://git-wip-us.apache.org/repos/asf?p=ambari.git&a=commit&h=ab532a54bd2ebf851edeb82a3866a56f72a54557)
* ambari-web/test/app_test.js
* ambari-web/app/mappers/stack_service_mapper.js
* ambari-web/app/app.js


> Reused Keys and Values fail with a Combiner
> -------------------------------------------
>
>                 Key: HADOOP-2
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>             Fix For: 0.1.0
>
>         Attachments: clone-map-output.patch
>
>
> If the map function reuses the key or value by destructively modifying it after the output.collect(key,value)
call and your application uses a combiner, the data is corrupted by having lots of instances
with the last key or value.



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