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Tasks failing with following error continuously

Question asked by siddharth1988 on May 19, 2013
Latest reply on May 19, 2013 by nabeel
Hi My map tasks fail with these errors :-

Error initializing attempt_201304091120_85011_m_000082_0: Job initialization failed (255). with output: Reading task controller config from /opt/mapr/hadoop/hadoop-0.20.2/conf/taskcontroller.cfg
number of groups = 8
main : command provided 0
main : user is czhan4
number of groups = 4
Can't open /tmp/mapr-hadoop/mapred/local/taskTracker/czhan4/jobcache/job_201304091120_85011/jobToken for output - File exists failed to copy credential file at org.apache.hadoop.mapred.LinuxTaskController.initializeJob( at org.apache.hadoop.mapred.TaskTracker$ at Method) at at at org.apache.hadoop.mapred.TaskTracker.initializeJob( at org.apache.hadoop.mapred.TaskTracker.localizeJob( at org.apache.hadoop.mapred.TaskTracker$ Caused by: org.apache.hadoop.util.Shell$ExitCodeException: at org.apache.hadoop.util.Shell.runCommand( at at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute( at org.apache.hadoop.mapred.LinuxTaskController.initializeJob(

Please help. Why am I getting these errors ?