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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-2785) MiniMR cluster thread crashes if no hadoop log dir set
Date Mon, 08 Aug 2011 16:04:27 GMT
MiniMR cluster thread crashes if no hadoop log dir set
------------------------------------------------------

                 Key: MAPREDUCE-2785
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2785
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: jobtracker
    Affects Versions: 0.20.203.0
            Reporter: Steve Loughran
            Priority: Minor


I'm marking this as minor as it is most obvious in the MiniMRCluster, but the root cause is
in the JT. 

If you instantiate an MiniMR Cluster without setting {{hadoop.job.history.location}} in the
configuration and the system property {{hadoop.log.dir}} unset, then the JobHistory throws
an NPE. In production, that would be picked up as a failure to start the JT. In the MiniMRCluster,
all it does is crash the JT thread -which isn't noticed by the MiniMR cluster. You see the
logged error, but the tests will just timeout waiting for things to come up

2011/08/08 17:46:26:427 CEST [ERROR][Thread-44] org.apache.hadoop.mapred.MiniMRCluster - Job
tracker crashed <java.lang.NullPointerException>         java.lang.NullPointerException
 	at java.io.File.<init>(File.java:222)
 	at org.apache.hadoop.mapred.JobHistory.initLogDir(JobHistory.java:531)
 	at org.apache.hadoop.mapred.JobHistory.init(JobHistory.java:499)
 	at org.apache.hadoop.mapred.JobTracker$2.run(JobTracker.java:2316)
 	at org.apache.hadoop.mapred.JobTracker$2.run(JobTracker.java:2313)
 	at java.security.AccessController.doPrivileged(Native Method)
 	at javax.security.auth.Subject.doAs(Subject.java:396)
 	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059)
 	at org.apache.hadoop.mapred.JobTracker.<init>(JobTracker.java:2313)
 	at org.apache.hadoop.mapred.JobTracker.<init>(JobTracker.java:2171)
 	at org.apache.hadoop.mapred.JobTracker.startTracker(JobTracker.java:300)
 	at org.apache.hadoop.mapred.MiniMRCluster$JobTrackerRunner$1.run(MiniMRCluster.java:114)
 	at org.apache.hadoop.mapred.MiniMRCluster$JobTrackerRunner$1.run(MiniMRCluster.java:112)
 	at java.security.AccessController.doPrivileged(Native Method)
 	at javax.security.auth.Subject.doAs(Subject.java:396)
 	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059)
 	at org.apache.hadoop.mapred.MiniMRCluster$JobTrackerRunner.run(MiniMRCluster.java:112)
 	at java.lang.Thread.run(Thread.java:662)


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