Hi, While running a mapred job map task never getting assigned. The message for a map in web interface is "No Task Attempts found". When I check the logs there are couple of errors as following:
2013-04-12 02:29:04,454 ERROR org.apache.hadoop.security.UserGroupInformation: PriviledgedActionException as:jobs cause:java.io.IOException: java.lang.NullPointerException 2013-04-12 02:29:04,455 INFO org.apache.hadoop.ipc.Server: IPC Server handler 8 on 4571, call heartbeat(org.apache.hadoop.mapred.TaskTrackerStatus@8f9c09e, false, false, true, 4) from 192.168.2.20:59968: error: java.io.IOException: java.lang.NullPointerException java.io.IOException: java.lang.NullPointerException at org.apache.hadoop.mapred.JobInProgress.getMatchingLevelForNodes(JobInProgress.java:1699) at org.apache.hadoop.mapred.JobInProgress.addRunningTaskToTIP(JobInProgress.java:1784) at org.apache.hadoop.mapred.JobInProgress.obtainNewNonLocalMapTask(JobInProgress.java:1440) at org.apache.hadoop.mapred.JobQueueTaskScheduler.assignTasks(JobQueueTaskScheduler.java:189) at org.apache.hadoop.mapred.JobTracker.heartbeat(JobTracker.java:3398) at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:563) at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1388) at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1384) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:415) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1093) at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1382) 2013-04-12 02:29:04,463 INFO org.apache.hadoop.mapred.JobTracker: Removing task 'attempt_201304120228_0001_m_000002_0' Some please help me to resolve this issue. I am using hadoop-1.0.2 Thanks, Sandeep.
