Tony Zhao created CASSANDRA-5679:
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Summary: 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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