Sagar, Set the following property in your JobConf (or using -D)
* mapred*.*reduce*.*tasks=0* * * That should do the trick. Alejandro *** * On Fri, Mar 11, 2011 at 1:53 PM, Sagar Kohli <[email protected]>wrote: > Hi , > > > > I am trying to run a job which does not require reducer, I commented out > the reducer configuration from the job, but now its throwing following error > > > > *java.lang.ClassCastException*: class java.nio.ByteBuffer > > at java.lang.Class.asSubclass(Unknown Source) > > at org.apache.hadoop.mapred.JobConf.getOutputKeyComparator(* > JobConf.java:599*) > > at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.<init>(* > MapTask.java:791*) > > at org.apache.hadoop.mapred.MapTask$NewOutputCollector.<init>(* > MapTask.java:524*) > > at org.apache.hadoop.mapred.MapTask.runNewMapper(*MapTask.java:613*) > > at org.apache.hadoop.mapred.MapTask.run(*MapTask.java:305*) > > at org.apache.hadoop.mapred.LocalJobRunner$Job.run(* > LocalJobRunner.java:177*) > > 11/03/11 11:19:12 INFO mapred.JobClient: map 0% reduce 0% > > > > > > *Is it possible to run a job only with mapper??* > > * * > > * * > > Regards > > Sagar > > ------------------------------ > > Are you exploring a Big Data Strategy ? Listen to this recorded webinar on > Planning your Hadoop/ NoSQL projects for 2011 at > www.impetus.com/featured_webinar?eventid=37 > > Follow us on www.twitter.com/impetuscalling or visit www.impetus.com to > know more. > > > NOTE: This message may contain information that is confidential, > proprietary, privileged or otherwise protected by law. The message is > intended solely for the named addressee. If received in error, please > destroy and notify the sender. Any use of this email is prohibited when > received in error. Impetus does not represent, warrant and/or guarantee, > that the integrity of this communication has been maintained nor that the > communication is free of errors, virus, interception or interference. >
