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https://issues.apache.org/jira/browse/HDFS-15599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17202523#comment-17202523
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Fengnan Li commented on HDFS-15599:
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Thanks for the pointer [~ayushtkn] [~elgoiri]
Actually I have thought about HDFS-14249 which provides the ability from Router
admin, but not for the clients. To solve our problem, a programmatically
accessible API is needed. Think about when Hive wants to rename to promote a
table from staging to prod, it needs to check the targeted location is in the
same cluster or not with the cluster holding the staging db.
> RBF: Add API to expose resolved destinations (namespace) in Router
> ------------------------------------------------------------------
>
> Key: HDFS-15599
> URL: https://issues.apache.org/jira/browse/HDFS-15599
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Fengnan Li
> Assignee: Fengnan Li
> Priority: Major
>
> We have seen quite often requests like where a path in Router is actually
> pointed. Two main use cases are:
> 1) Calculate the HDFS capacity usage allocation of all Hive tables, whose
> have onboarded to Router.
> 2) A failure prevention method for cross-cluster rename. First check the
> source HDFS location and dest HDFS location, and then issue a distcp cmd if
> possible to avoid the Exception.
> Inside Router, the function getLocationsForPath does the work but it is
> internal only and not visible to Clients.
> RouterAdmin has getMountTableEntries but this is a cast of Mount table
> without any resolving.
>
> We are proposing adding such an API, and there are two ways:
> 1) Adding this API in RouterRpcServer, which requires the change in
> ClientNameNodeProtocol to include this new API.
> 2) Adding this API in RouterAdminServer, which requires the a protocol
> between Client and the admin server.
>
> There is one existing resolvePath in FileSystem which can be used to
> implement this call from client side.
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