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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (CASSANDRA-5679) Wide Row calls map method once per column in Hadoop MapReduce
Date Thu, 20 Jun 2013 20:46:20 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-5679?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Ellis resolved CASSANDRA-5679.
---------------------------------------

    Resolution: Duplicate
    
> Wide Row calls map method once per column in Hadoop MapReduce
> -------------------------------------------------------------
>
>                 Key: CASSANDRA-5679
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5679
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Hadoop
>    Affects Versions: 1.2.4
>         Environment: CentOS 6.3, Hadoop 1.1.2, Cassandra 1.2.4
>            Reporter: Tony Zhao
>
> When using Cassandra without wide row support in a Hadoop job, the map method gets a
number of columns limited by the SlicePredicate every time the map method in the mapper is
called; but when using wide row support, the map method is called once for every column. It
seems like the limit in SlicePredicate is ignored when wide row set to true. 
> This prevents in-map reducing code to work (i.e. emit top ten from a mapper).

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