JobTracker and TaskTracker enter infinite loop when TaskTracker reports bad
taskid
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Key: HADOOP-5761
URL: https://issues.apache.org/jira/browse/HADOOP-5761
Project: Hadoop Core
Issue Type: Bug
Components: mapred
Reporter: Todd Lipcon
If the TaskTracker somehow gets into a state where it has a task in
COMMIT_PENDING state that the JobTracker does not know about, the JobTracker
will throw NPEs while processing heartbeats. Due to HADOOP-3987, this causes
the JT and TT to enter an infinite heartbeat loop with no delays, and the TT
fails to make progress.
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