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RE: yarn-site.xml and aux-services
Following up on this, how exactly does one *install* the jar(s) for auxiliary service?  Can it be shipped out with the LocalResources of an AM?
MapReduce's aux-service is presumably installed with Hadoop and is just sitting there in the right place, but if one wanted to make a whole new aux-service that belonged with an AM, how would one do it?

John

-----Original Message-----
From: John Lilley [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, June 05, 2013 11:41 AM
To: [EMAIL PROTECTED]
Subject: RE: yarn-site.xml and aux-services

Wow, thanks.  Is this documented anywhere other than the code?  I hate to waste y'alls time on things that can be RTFMed.
John
-----Original Message-----
From: Harsh J [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, June 05, 2013 9:35 AM
To: <[EMAIL PROTECTED]>
Subject: Re: yarn-site.xml and aux-services

John,

The format is ID and sub-config based:

First, you define an ID as a service, like the string "foo". This is the ID the applications may lookup in their container responses map we discussed over another thread (around shuffle handler).

<property>
    <name>yarn.nodemanager.aux-services</name>
    <value>foo</value>
</property>

Then you define an actual implementation class for that ID "foo", like so:

<property>
<name>yarn.nodemanager.aux-services.foo.class</name>
<value>com.mypack.MyAuxServiceClassForFoo</value>
</property>

If you have multiple services foo and bar, then it would appear like the below (comma separated IDs and individual configs):

<property>
    <name>yarn.nodemanager.aux-services</name>
    <value>foo,bar</value>
</property>
<property>
    <name>yarn.nodemanager.aux-services.foo.class</name>
    <value>com.mypack.MyAuxServiceClassForFoo</value>
</property>
<property>
    <name>yarn.nodemanager.aux-services.bar.class</name>
    <value>com.mypack.MyAuxServiceClassForBar</value>
</property>

On Wed, Jun 5, 2013 at 8:42 PM, John Lilley <[EMAIL PROTECTED]> wrote:
> 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:[EMAIL PROTECTED]]
> Sent: Tuesday, June 04, 2013 11:58 PM
> To: <[EMAIL PROTECTED]>
> 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 <[EMAIL PROTECTED]> 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 | [EMAIL PROTECTED] | www.redpoint.net
>>
>>
>
>
>
> --
> Harsh J

--
Harsh J