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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5852) JobTracker accepts heartbeats before startup is complete
Date Sat, 16 May 2009 12:14:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12710099#action_12710099
] 

Devaraj Das commented on HADOOP-5852:
-------------------------------------

This issue has been resolved in 0.20 IIRC, where the RPC handlers are started at the end of
all initialization. Look at JobTracker.main - it constructs the JobTracker object and then
invokes offerService, and towards the end of offerService, the interTrackerServer is started..

> 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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