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HDFS >> mail # dev >> MapFile.Writer

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Trying to create a write to a MapFile on Hadoop version 2.2.0

MapFile.Writer writer = new MapFile.Writer(conf,

But fails with illegal argument exception eventhough the key can value
class option is set. Any help is much appreciated.
Exception in thread "main" java.lang.IllegalArgumentException: key class or
comparator option must be set