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From John Lilley <john.lil...@redpoint.net>
Subject RE: yarn-site.xml and aux-services
Date Thu, 22 Aug 2013 20:38:36 GMT
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:john.lilley@redpoint.net] 
Sent: Wednesday, June 05, 2013 11:41 AM
To: user@hadoop.apache.org
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:harsh@cloudera.com]
Sent: Wednesday, June 05, 2013 9:35 AM
To: <user@hadoop.apache.org>
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 <john.lilley@redpoint.net> 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: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



--
Harsh J

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