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https://issues.apache.org/jira/browse/YARN-1151?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16412253#comment-16412253
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Vinod Kumar Vavilapalli commented on YARN-1151:
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>From the POC patch, it looks like NM will repeatedly download the tar again
>and again on every restart, am I reading that right? We shouldn't be doing
>that. May be we should get file-status, verify the checksum and skip if it is
>the same. Exactly like dist-cache. These are some of the reasons why we should
>simply reuse the core ResourceLocalizationService for localizing this.
We should also figure out the right behavior if HDFS is down. What should NM do
on a fresh start if HDFS is down? What it should do on a restart if HDFS is
down?
> Ability to configure auxiliary services from HDFS-based JAR files
> -----------------------------------------------------------------
>
> Key: YARN-1151
> URL: https://issues.apache.org/jira/browse/YARN-1151
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: nodemanager
> Affects Versions: 2.1.0-beta, 2.9.0
> Reporter: john lilley
> Assignee: Xuan Gong
> Priority: Major
> Labels: auxiliary-service, yarn
> Attachments: YARN-1151.1.patch, YARN-1151.branch-2.poc.patch,
> [YARN-1151] [Design] Configure auxiliary services from HDFS-based JAR
> files.pdf
>
>
> I would like to install an auxiliary service in Hadoop YARN without actually
> installing files/services on every node in the system. Discussions on the
> user@ list indicate that this is not easily done. The reason we want an
> auxiliary service is that our application has some persistent-data components
> that are not appropriate for HDFS. In fact, they are somewhat analogous to
> the mapper output of MapReduce's shuffle, which is what led me to
> auxiliary-services in the first place. It would be much easier if we could
> just place our service's JARs in HDFS.
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