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https://issues.apache.org/jira/browse/HADOOP-5852?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon resolved HADOOP-5852.
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Resolution: Invalid
Sorry guys, false alarm. Turns out this bug does not exist in unpatched
branch-18 -- it was introduced by the HADOOP-3746 (fair scheduler) backport
patch. I'll comment on that JIRA. Closing as invalid.
> JobTracker accepts heartbeats before startup is complete
> --------------------------------------------------------
>
> Key: HADOOP-5852
> URL: https://issues.apache.org/jira/browse/HADOOP-5852
> Project: Hadoop Core
> Issue Type: Bug
> Reporter: Todd Lipcon
> Priority: Critical
>
> When the JobTracker is instantiated, it starts listening on its RPC
> interfaces before its startup is complete (ie the constructor is finished
> executing). Because of this, jt.taskScheduler.taskTrackerManager can be null
> when the JT receives a heartbeat from a TT. This throws the JT/TT pair into a
> tight infinite loop (HADOOP-5761)
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