Did you create your input file using a SequenceFile.Writer? Hairong
-----Original Message----- From: Teppo Kurki [mailto:[EMAIL PROTECTED] Sent: Wednesday, March 29, 2006 12:33 PM To: [email protected] Subject: Re: Different Key/Value classes for Map and Reduce? Hairong Kuang wrote: >If you have a Jobconf called xxJob, you can set the key/value types for >the map phase as follows: >xxJob.setInputFormat(SequenceFileInputFormat.class); >xxJob.setInputKeyClass(UTF8.class); >xxJob.setInputValueClass(ArrayWritable.class); > > > So that's how it's supposed to work. Could I suggest more intuitive setMap/ReduceKey/ValueClass methods? However it still doesn't work, maybe because in MapTask.run the Writer is constructed with Output classnames: new SequenceFile.Writer(FileSystem.getNamed("local", job), this.mapOutputFile.getOutputFile(getTaskId(), i).toString(), job.getOutputKeyClass(), job.getOutputValueClass()); Is this the way it ought to be?
