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https://issues.apache.org/jira/browse/HADOOP-5525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12683805#action_12683805
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Hemanth Yamijala commented on HADOOP-5525:
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If a thread throws an uncaught exception and dies, will it be in the state 
TERMINATED ? The main use case is to find out what threads are not running. It 
would be very nice if an uncaught exception's stack trace is printed as a 
diagnostic. Since that information would be available from the log or out file, 
that may not be a mandatory thing to resolve this issue, only a nice to have 
feature.

> Provide a way to query job tracker about its daemon thread's status
> -------------------------------------------------------------------
>
>                 Key: HADOOP-5525
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5525
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: mapred
>            Reporter: Amareshwari Sriramadasu
>            Assignee: Amareshwari Sriramadasu
>             Fix For: 0.21.0
>
>
> Admin needs to know the status of all threads in JobTracker (whether they are 
> alive or not) at any point of time. This helps alot in debugging crashes.

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