NPE in expiry thread when a TT is lost
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Key: MAPREDUCE-754
URL: https://issues.apache.org/jira/browse/MAPREDUCE-754
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: jobtracker
Reporter: Ramya R
Priority: Minor
NullPointerException is obtained in Tracker Expiry Thread. Below is the
exception obtained in the JT logs
{noformat}
ERROR org.apache.hadoop.mapred.JobTracker: Tracker Expiry Thread got exception:
java.lang.NullPointerException
at
org.apache.hadoop.mapred.JobTracker.updateTaskTrackerStatus(JobTracker.java:2971)
at org.apache.hadoop.mapred.JobTracker.access$300(JobTracker.java:104)
at
org.apache.hadoop.mapred.JobTracker$ExpireTrackers.run(JobTracker.java:381)
at java.lang.Thread.run(Thread.java:619)
{noformat}
The steps to reproduce this issue are:
* Blacklist a TT.
* Restart it.
* The above exception is obtained when the first instance of TT is marked as
lost.
However the above exception does not break any functionality.
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