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https://issues.apache.org/jira/browse/HDFS-16786?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Haiyang Hu resolved HDFS-16786.
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Resolution: Duplicate
> RBF: Create -addNamespace method in dfsrouteradmin
> --------------------------------------------------
>
> Key: HDFS-16786
> URL: https://issues.apache.org/jira/browse/HDFS-16786
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Haiyang Hu
> Assignee: Haiyang Hu
> Priority: Major
>
> When add Namespaces to the existing MountTable.
> there are the following 2 methods：
> 1.hdfs dfsrouteradmin -add
> for example:
> hdfs dfsrouteradmin -add /user/project newNs /user/project
> this method problem is if no '-order' is specified,
> the order will set the default HASH and overwrite the existing MountTable
> order value，
> if the previously set order value is another DestinationOrder so may cause
> problems use of this MountTable.
> 2.hdfs dfsrouteradmin -update
> for example:
> hdfs dfsrouteradmin -update /user/project ns1,ns2,newNs /user/project -order
> HASH_ALL
> this method problem is need to get the existing ns lists, and the correct
> '-order' also needs to be specified,
> if there is problem with the specified parameters, which will also may cause
> problems use of this MountTable.
> so currently consider add new method,
> for example:
> hdfs dfsrouteradmin -addNamespace /user/project newNs
> to satisfy add Namespaces to the existing MountTable and facilitate daily
> maintenance of MountTable
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