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https://issues.apache.org/jira/browse/MAPREDUCE-5951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15989545#comment-15989545
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Chris Trezzo commented on MAPREDUCE-5951:
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[~xkrogen]
bq. Is this so that the uploading to SCM can be done by the NM, which is a
privileged user, to have more secure control over it?
Yes exactly. We wanted to ensure that only trusted entities (i.e. the SCM and
the node manager) were modifying the shared cached directories in HDFS.
Additionally, we wanted to make sure that the checksum used when adding a
resource to the cache was computed by a trusted entity as well.
> Add support for the YARN Shared Cache
> -------------------------------------
>
> Key: MAPREDUCE-5951
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5951
> Project: Hadoop Map/Reduce
> Issue Type: New Feature
> Reporter: Chris Trezzo
> Assignee: Chris Trezzo
> Labels: BB2015-05-TBR
> Attachments: MAPREDUCE-5951-Overview.001.pdf,
> MAPREDUCE-5951-trunk.016.patch, MAPREDUCE-5951-trunk.017.patch,
> MAPREDUCE-5951-trunk.018.patch, MAPREDUCE-5951-trunk.019.patch,
> MAPREDUCE-5951-trunk-v10.patch, MAPREDUCE-5951-trunk-v11.patch,
> MAPREDUCE-5951-trunk-v12.patch, MAPREDUCE-5951-trunk-v13.patch,
> MAPREDUCE-5951-trunk-v14.patch, MAPREDUCE-5951-trunk-v15.patch,
> MAPREDUCE-5951-trunk-v1.patch, MAPREDUCE-5951-trunk-v2.patch,
> MAPREDUCE-5951-trunk-v3.patch, MAPREDUCE-5951-trunk-v4.patch,
> MAPREDUCE-5951-trunk-v5.patch, MAPREDUCE-5951-trunk-v6.patch,
> MAPREDUCE-5951-trunk-v7.patch, MAPREDUCE-5951-trunk-v8.patch,
> MAPREDUCE-5951-trunk-v9.patch
>
>
> Implement the necessary changes so that the MapReduce application can
> leverage the new YARN shared cache (i.e. YARN-1492).
> Specifically, allow per-job configuration so that MapReduce jobs can specify
> which set of resources they would like to cache (i.e. jobjar, libjars,
> archives, files).
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