[jira] [Assigned] (HDFS-15747) RBF: Rename across sub-namespaces.

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

     [ https://issues.apache.org/jira/browse/HDFS-15747?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jinglun reassigned HDFS-15747:
------------------------------

    Assignee: Jinglun

> RBF: Rename across sub-namespaces.
> ----------------------------------
>
>                 Key: HDFS-15747
>                 URL: https://issues.apache.org/jira/browse/HDFS-15747
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Jinglun
>            Assignee: Jinglun
>            Priority: Major
>
> Since we have HDFS-15294, we can use it to rename across namespaces. This Jira proposes a basic implementation: enable the Router to handle rename within multi-namespaces with the federation balance tool.
> If the conditions below are satisfied, the router will rename the path across namespaces:
>  1. The 'enable rename across namespaces' switch is on. Default is off.
>  2. The remote location of src and the dst should be exactly one and should at different namespaces.
> We can implement this in 2 steps:
>  -1. Move hadoop-federation-balance module to hadoop-hdfs-rbf. That's because the implementation of federation balance depends on hadoop-hdfs-rbf and hadoop-distcp. To avoid circular dependency we can move hadoop-federation-balance to hadoop-hdfs-rbf and let hadoo-hdfs-rbf depend on hadoop-distcp.-
> 1. Move the router-related part from hadoop-federation-balance module to hadoop-hdfs-rbf module. So we can keep the hadoop-federation-balance module independent.
>  2. The basic implementation of rename across sub-namespaces. This step relies on step one.



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