[jira] [Resolved] (HDFS-16786) RBF: Create -addNamespace method in dfsrouteradmin

["Haiyang Hu (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-16786?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Haiyang Hu resolved HDFS-16786.
-------------------------------
    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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