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Even JT accepts exclude/include hosts files for the slaves. If they aren't populated, JT by default accepts TTs that successfully register with it at runtime.

Thanks,
+Vinod

On Oct 22, 2012, at 7:55 AM, Kartashov, Andy wrote:

> Gentlemen,
>
> Can you please explain which property is responsible to tell JobTracker where TaskTruckers are running?
>
> I get this far so far:
>
> NN knows where SNN runs by specifying FQDN in the conf/masters of the NN
> NN knows where DN runs by specifying FQDNs of the DNs in the conf/slaves of the NN
> SNN knows the host:port of the NN using hdfs-core.xml
> DNs know wherethehost:port of the NN using hdfs-core.xml
>
> TTs know where the JT is using mapred-site.xml
>
> But how does JT knows where the TTs are?
>
> Please help.
>
> Thanks,
> Andy
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