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From Harsh J <ha...@cloudera.com>
Subject Re: what does the yarn.nodemanager.aux-services stand for
Date Mon, 28 Jan 2013 15:48:02 GMT

The function of yarn.nodemanager.aux-services is to run any custom
Service [1] implementations from the user, in the YARN NodeManager's
runtime. The "aux" stands for auxiliary.

One such example of where this comes useful is the ShuffleHandler [2]
service, which helps MR do its shuffle work, without needing the NM
itself to provide a shuffle service unnecessarily (in case MR is not
required). Therefore, a ShuffleHandler is necessary to be configured
if you need to run MR2 apps (jobs), but not otherwise. A clear
difference, in case you're confused between MR2 and YARN, can be found
at [3].

Do feel free to ask any further questions you have.

[1] -  http://svn.apache.org/viewvc/hadoop/common/branches/branch-2/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/service/Service.java?view=markup
[2] - http://svn.apache.org/viewvc/hadoop/common/branches/branch-2/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-shuffle/src/main/java/org/apache/hadoop/mapred/ShuffleHandler.java?view=markup
[3] - http://www.cloudera.com/blog/2012/10/mr2-and-yarn-briefly-explained/

On Mon, Jan 28, 2013 at 6:43 PM, YouPeng Yang <yypvsxf19870706@gmail.com> wrote:
> Hi All
>    I am wondering what the yarn.nodemanager.aux-services stands for  。
> there even is not description about it in the yarn-default.xml。So i‘ve just
> ignored it when i tried the example,as a result ,it failed。
>   I have do some google,however,everyone just setup it in the
> yarn-site.xml,but no one tells the  description about it。
>   please,helps will be appreciated .
>  .

Harsh J

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