Tnx Clint Heath, It is solved as Clint said. Farrokh Shahriari
On Thu, Apr 11, 2013 at 11:44 AM, Arun C Murthy <[email protected]> wrote: > 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/ > > >
