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From daemeon reiydelle <daeme...@gmail.com>
Subject Re: What happens to data nodes when name node has failed for long time?
Date Sun, 14 Dec 2014 22:28:14 GMT
I found the terminology of primary and secondary to be a bit confusing in
describing operation after a failure scenario. Perhaps it is helpful to
think that the Hadoop instance is guided to select a node as primary for
normal operation. If that node fails, then the backup becomes the new
primary. In analyzing traffic it appears that the restored node does not
become primary again until the whole instance restarts. I myself would
welcome clarification on this observed behavior.



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On Fri, Dec 12, 2014 at 7:56 AM, Rich Haase <rhaase@pandora.com> wrote:

>   The remaining cluster services will continue to run.  That way when the
> namenode (or other failed processes) is restored the cluster will resume
> healthy operation.  This is part of hadoop’s ability to handle network
> partition events.
>
>  *Rich Haase* | Sr. Software Engineer | Pandora
> m 303.887.1146 | rhaase@pandora.com
>
>   From: Chandrashekhar Kotekar <shekhar.kotekar@gmail.com>
> Reply-To: "user@hadoop.apache.org" <user@hadoop.apache.org>
> Date: Friday, December 12, 2014 at 3:57 AM
> To: "user@hadoop.apache.org" <user@hadoop.apache.org>
> Subject: What happens to data nodes when name node has failed for long
> time?
>
>   Hi,
>
>  What happens if name node has crashed for more than one hour but
> secondary name node, all the data nodes, job tracker, task trackers are
> running fine? Do those daemon services also automatically shutdown after
> some time? Or those services keep running hoping for namenode to come back?
>
> Regards,
> Chandrash3khar Kotekar
> Mobile - +91 8600011455
>

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