Lost heartbeat response containing MapTask throws NPE when it is resent
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Key: MAPREDUCE-2237
URL: https://issues.apache.org/jira/browse/MAPREDUCE-2237
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: jobtracker
Affects Versions: 0.21.0, 0.20.2, 0.22.0
Reporter: Todd Lipcon
When the JT sends a heartbeat response, it records it in
trackerToHeartbeatResponseMap. But after MapTask writes its input split, it
sets that split to null (assumedly to save memory?). So, if the heartbeat
response is lost, and the JT needs to resend it, it will throw NPE since the
split information has been lost.
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