ConcurrentModificationException when tasktracker updates task status to
jobtracker
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Key: MAPREDUCE-1136
URL: https://issues.apache.org/jira/browse/MAPREDUCE-1136
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: tasktracker
Reporter: Qi Liu
In Hadoop 0.18.3, the following exception happened during a job execution. It
does not happen often.
Here is the stack trace of the exception.
org.apache.hadoop.ipc.RemoteException: java.io.IOException:
java.util.ConcurrentModificationException
at java.util.TreeMap$PrivateEntryIterator.nextEntry(TreeMap.java:1100)
at java.util.TreeMap$ValueIterator.next(TreeMap.java:1145)
at org.apache.hadoop.mapred.JobTracker.getAllJobs(JobTracker.java:2376)
at sun.reflect.GeneratedMethodAccessor32.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:481)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:890)
org.apache.hadoop.ipc.Client.call(Client.java:716)
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