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https://issues.apache.org/jira/browse/HDFS-12292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16130945#comment-16130945
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Chen Liang commented on HDFS-12292:
-----------------------------------
Thanks [~erofeev] for the patch! Curious though, is it possible to check that
only when viewfs is being used we perform this path resolving? Because it seems
to me that in the non-viewfs case, this check doesn't really do anything and we
end up just spending extra unnecessary time for each of certain operations.
(Please correct me if I'm wrong.)
> Federation: Support viewfs:// schema path for DfsAdmin commands
> ---------------------------------------------------------------
>
> Key: HDFS-12292
> URL: https://issues.apache.org/jira/browse/HDFS-12292
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: federation
> Reporter: Mikhail Erofeev
> Assignee: Mikhail Erofeev
> Attachments: HDFS-12292-002.patch, HDFS-12292-003.patch,
> HDFS-12292.patch
>
>
> Motivation:
> As of now, clients need to specify a nameservice when a cluster is federated,
> otherwise, the exception is fired:
> {code}
> hdfs dfsadmin -setQuota 10 viewfs://vfs-root/user/uname
> setQuota: FileSystem viewfs://vfs-root/ is not an HDFS file system
> # with fs.defaultFS = viewfs://vfs-root/
> hdfs dfsadmin -setQuota 10 vfs-root/user/uname
> setQuota: FileSystem viewfs://vfs-root/ is not an HDFS file system
> # works fine thanks to https://issues.apache.org/jira/browse/HDFS-11432
> hdfs dfsadmin -setQuota 10 hdfs://users-fs/user/uname
> {code}
> This creates inconvenience, inability to rely on fs.defaultFS and forces to
> create client-side mappings for management scripts
> Implementation:
> PathData that is passed to commands should be resolved to its actual
> FileSystem
> Result:
> ViewFS will be resolved to the actual HDFS file system
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