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https://issues.apache.org/jira/browse/HDFS-6826?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14094239#comment-14094239
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Alejandro Abdelnur commented on HDFS-6826:
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[~daryn],
A proxy NN was one of the alternatives considered before settling for the Authz
plugin.
I like it because of the very same reasons you point out.
The concerns with that approach are:
* It is a new service
* It has to support HA
* It will be error prone for users the use of 2 NN URIs:
** One for HDFS authz, another for Hive authz
** A file or directory being added to a Hive table would first be referenced
via the NN and then via the proxy NN
** Users my add file URIs of the proxy NN in the HiveMetaStore
Regarding the plugin approach. If the plugin does not interact with external
systems during a filesystem RPC call and just uses inmemory data, that
addresses your concerns, right?
> Plugin interface to enable delegation of HDFS authorization assertions
> ----------------------------------------------------------------------
>
> Key: HDFS-6826
> URL: https://issues.apache.org/jira/browse/HDFS-6826
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: security
> Affects Versions: 2.4.1
> Reporter: Alejandro Abdelnur
> Assignee: Alejandro Abdelnur
> Attachments: HDFS-6826-idea.patch,
> HDFSPluggableAuthorizationProposal.pdf
>
>
> When Hbase data, HiveMetaStore data or Search data is accessed via services
> (Hbase region servers, HiveServer2, Impala, Solr) the services can enforce
> permissions on corresponding entities (databases, tables, views, columns,
> search collections, documents). It is desirable, when the data is accessed
> directly by users accessing the underlying data files (i.e. from a MapReduce
> job), that the permission of the data files map to the permissions of the
> corresponding data entity (i.e. table, column family or search collection).
> To enable this we need to have the necessary hooks in place in the NameNode
> to delegate authorization to an external system that can map HDFS
> files/directories to data entities and resolve their permissions based on the
> data entities permissions.
> I’ll be posting a design proposal in the next few days.
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