Jinglun created HDFS-15747:
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Summary: 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
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.
2. The basic implementation of rename across sub-namespaces. This step relies
on step one.
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