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Posted to commits@cassandra.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2013/06/20 22:46:20 UTC
[jira] [Resolved] (CASSANDRA-5679) Wide Row calls map method once
per column in Hadoop MapReduce
[ 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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