[ http://issues.apache.org/jira/browse/HADOOP-615?page=comments#action_12443677 ] Nigel Daley commented on HADOOP-615: ------------------------------------
Looking at the constructor of JobTracker, it looks like JobTracker advertises itself before it has completed initialization. Given that the constructor is not synchronized, my guess is that JobTracker.submitJob is getting called before initialization completes, thus myMetrics is null causing the NPE. > Sporadic TestEmptyJobWithDFS failure due to NPE is JobTracker.submitJob() > ------------------------------------------------------------------------- > > Key: HADOOP-615 > URL: http://issues.apache.org/jira/browse/HADOOP-615 > Project: Hadoop > Issue Type: Bug > Components: mapred > Affects Versions: 0.7.2 > Reporter: Nigel Daley > Assigned To: Owen O'Malley > Attachments: TEST-org.apache.hadoop.mapred.TestEmptyJobWithDFS.txt > > > org.apache.hadoop.mapred.TestEmptyJobWithDFS has failed a couple of times > (low reproducibility) with the following exception: > 2006-10-17 21:48:24,875 INFO ipc.Server (Server.java:run(516)) - Server > handler 2 on 50050 call error: java.io.IOException: > java.lang.NullPointerException > java.io.IOException: java.lang.NullPointerException > at org.apache.hadoop.mapred.JobTracker.submitJob(JobTracker.java:1020) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) > at java.lang.reflect.Method.invoke(Method.java:585) > at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:385) > at org.apache.hadoop.ipc.Server$Handler.run(Server.java:514) > Complete test log attached. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://issues.apache.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira
