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https://issues.apache.org/jira/browse/MAPREDUCE-2237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12977156#action_12977156
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Arun C Murthy commented on MAPREDUCE-2237:
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Yes, the split was set to null to save memory. The fix should be trivial - add
the split info to all LaunchTaskAction objects in the HeartbeatResponse object.
An important task is to check why the heartbeat response was lost. That problem
was mainly due to our RPC system, something we haven't seen in a long while...
> Lost heartbeat response containing MapTask throws NPE when it is resent
> -----------------------------------------------------------------------
>
> Key: MAPREDUCE-2237
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2237
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: jobtracker
> Affects Versions: 0.20.2, 0.21.0, 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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