Moving to user@. What version of Hadoop are you running?
On Apr 10, 2013, at 6:57 PM, Farrokh Shahriari wrote: > Hello, > > I've having a problem running my map/reduce job on my cluster. The map phase, > completes successfully, but the reduce phase fails with the following error > message: > > Error: java.lang.NullPointerException > at > java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:768) > at > org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.getMapCompletionEvents(ReduceTask.java:2835) > at > org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.run(ReduceTask.java:2756) > > I've done a lot of searching, and I've found some solutions as to not having > any underscores in my hosts names. I changed them all, but the problem still > > > hasn't resolved. > Does anyone have any idea what the problem can be? > > Thanks, > Farrokh > -- Arun C. Murthy Hortonworks Inc. http://hortonworks.com/
