May be that additional information can help. That is a message from the tasktracker where the error occured. 2010-09-29 14:28:30,761 INFO org.apache.hadoop.mapred.ReduceTask: GetMapEventsThread exiting 2010-09-29 14:28:30,761 INFO org.apache.hadoop.mapred.ReduceTask: getMapsEventsThread joined. 2010-09-29 14:28:30,761 INFO org.apache.hadoop.mapred.ReduceTask: Closed ram manager 2010-09-29 14:28:30,764 INFO org.apache.hadoop.mapred.ReduceTask: Interleaved on-disk merge complete: 0 files left. 2010-09-29 14:28:30,764 INFO org.apache.hadoop.mapred.ReduceTask: In-memory merge complete: 14 files left. 2010-09-29 14:28:30,794 INFO org.apache.hadoop.mapred.Merger: Merging 14 sorted segments 2010-09-29 14:28:30,798 WARN org.apache.hadoop.mapred.TaskTracker: Error running child
