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From John Lilley <john.lil...@redpoint.net>
Subject RE: yarn-site.xml and aux-services
Date Wed, 05 Jun 2013 15:12:38 GMT
Good, I was hoping that would be the case.  But what are the mechanics of it?  Do I just add
another entry?  And what exactly is "madreduce.shuffle"?  A scoped class name?  Or a key string
into some map elsewhere?

e.g. like:

<property>
    <name>yarn.nodemanager.aux-services</name>
    <value>mapreduce.shuffle</value>
</property>
<property>
    <name>yarn.nodemanager.aux-services</name>
    <value>myauxserviceclassname</value>
</property>

Concerning auxiliary services -- do they communicate with NodeManager via RPC?  Is there an
interface to implement?  How are they opened and closed with NodeManager?

Thanks
John

-----Original Message-----
From: Harsh J [mailto:harsh@cloudera.com] 
Sent: Tuesday, June 04, 2013 11:58 PM
To: <user@hadoop.apache.org>
Subject: Re: yarn-site.xml and aux-services

Yes, thats what this is for. You can implement, pass in and use your own AuxService. It needs
to be on the NodeManager CLASSPATH to run (and NM has to be restarted to apply).

On Wed, Jun 5, 2013 at 4:00 AM, John Lilley <john.lilley@redpoint.net> wrote:
> I notice the yarn-site.xml
>
>
>
>   <property>
>
>     <name>yarn.nodemanager.aux-services</name>
>
>     <value>mapreduce.shuffle</value>
>
>     <description>shuffle service that needs to be set for Map Reduce 
> to run </description>
>
>   </property>
>
>
>
> Is this a general-purpose hook?
>
> Can I tell yarn to run *my* per-node service?
>
> Is there some other way (within the recommended Hadoop framework) to 
> run a per-node service that exists during the lifetime of the NodeManager?
>
>
>
> John Lilley
>
> Chief Architect, RedPoint Global Inc.
>
> 1515 Walnut Street | Suite 200 | Boulder, CO 80302
>
> T: +1 303 541 1516  | M: +1 720 938 5761 | F: +1 781-705-2077
>
> Skype: jlilley.redpoint | john.lilley@redpoint.net | www.redpoint.net
>
>



--
Harsh J

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