MiniMR cluster thread crashes if no hadoop log dir set
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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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