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Date: Thu, 20 Jun 2013 21:14:20 +0000 (UTC)
From: "Tony Zhao (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
Message-ID: <JIRA.12654002.1371760732059.151261.1371762860501@arcas>
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Subject: [jira] [Updated] (CASSANDRA-5679) Wide Row calls map method once
 per column in Hadoop MapReduce
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     [ https://issues.apache.org/jira/browse/CASSANDRA-5679?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tony Zhao updated CASSANDRA-5679:
---------------------------------

    Labels: cassandra hadoop  (was: )
    
> 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
>              Labels: cassandra, hadoop
>
> 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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