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Posted to hdfs-user@hadoop.apache.org by Alexander Lorenz <wg...@gmail.com> on 2012/09/20 13:06:20 UTC

Re:

HI,

If a TT will be restarted and don't report back to the JT, the task will be rescheduled to another TT. When you start all TT at once, you'll lose some tasks, if you perform a rolling restart not.

- Alex

On Sep 20, 2012, at 12:31 PM, Ivan Tretyakov <it...@griddynamics.com> wrote:

> Hello!
> 
> I need to change some task trackers options. After options changed I need
> to restart every task tracker to apply changes.
> If there is running jobs onto cluster I'll loose the result of map tasks on
> this task trackers. Is there the way to do it with no losing map tasks
> results.
> If not, is there way to temporary deny new job submission to allow running
> jobs finish successfully and than restart services.
> This question related not only task services but all hadoop services.
> What is the best practice for new options applying?
> 
> -- 
> Best Regards
> Ivan Tretyakov

--
Alexander Alten-Lorenz
http://mapredit.blogspot.com
German Hadoop LinkedIn Group: http://goo.gl/N8pCF