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Posted to mapreduce-dev@hadoop.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2010/12/29 23:15:45 UTC
[jira] Created: (MAPREDUCE-2237) Lost heartbeat response containing
MapTask throws NPE when it is resent
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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