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https://issues.apache.org/jira/browse/MAPREDUCE-5403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13716503#comment-13716503
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Jason Lowe commented on MAPREDUCE-5403:
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bq. I don't think yarn.resourcemanager.address should be an environment
variable. I think there is a conceptual difference between a client knowing how
to contact a service and a client knowing about details of the service's
internals. Do you disagree?
I'm just pointing out that locating the YARN jars is not the only thing clients
may need to do to communicate with YARN. e.g.: a non-Java YARN client still
needs to locate the ResourceManager address somehow, and currently it can do
this via parsing yarn-site.xml. To me, yarn-site.xml is a site-specific config
regardless of whether it's a YARN server or YARN client processing it. For a
site that doesn't host any YARN daemons (e.g.: gateway or launcher node), that
becomes essentially a client-side-only config.
I can see where you're coming from, and maybe for the classpath we should do
something different (e.g.: environment variable and/or clients should use "yarn
classpath" to get the classpath instead). I wanted to point out there are
other interesting tidbits of information in yarn-site.xml besides the classpath
that clients may want to access, and I'm wondering what criteria qualifies a
client-consumed property to graduate to an environment variable or some other
mechanism for determining the value besides parsing yarn-site.xml.
> Get rid of yarn.application.classpath
> -------------------------------------
>
> Key: MAPREDUCE-5403
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5403
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: client
> Affects Versions: 2.0.5-alpha
> Reporter: Sandy Ryza
> Assignee: Sandy Ryza
>
> yarn.application.classpath is a confusing property because it is used by
> MapReduce and not YARN, and MapReduce already has
> mapreduce.application.classpath, which provides the same functionality.
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