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Posted to mapreduce-issues@hadoop.apache.org by "Devaraj K (JIRA)" <ji...@apache.org> on 2011/05/13 12:53:47 UTC

[jira] [Updated] (MAPREDUCE-2237) Lost heartbeat response containing MapTask throws NPE when it is resent

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2237?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Devaraj K updated MAPREDUCE-2237:
---------------------------------

    Attachment: MAPREDUCE-2237-0.23.patch
                MAPREDUCE-2237-0.20.patch

> 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
>         Attachments: MAPREDUCE-2237-0.20.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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