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https://issues.apache.org/jira/browse/MAPREDUCE-2237?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Devaraj K updated MAPREDUCE-2237:
---------------------------------
Resolution: Not A Problem
Status: Resolved (was: Patch Available)
It is no more problem in active versions.
> 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
> Assignee: Devaraj K
> Fix For: 0.24.0
>
> Attachments: MAPREDUCE-2237-0.20.patch, MAPREDUCE-2237-0.23.1.patch,
> MAPREDUCE-2237-0.23.2.patch, MAPREDUCE-2237-0.23.patch
>
>
> 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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