Yiqun Lin commented on HDFS-12615:

It looks amazing that we have fixed and made so many improvements for RBF. 
Thanks all the contributors!
 Just revisiting the previous plan of RBF phase 2 and ensuring we are in the 
same direction:
{quote}At this point the only critical task missing is enabling security 
(mainly HDFS-12284), Sherwood Zheng has been doing progress there and we are 
only missing the delegation tokens.
 The other tasks are mostly done we should try to complete them, the most 
important in my opinion:
 * HDFS-12773 to do a proper HDFS State Store.
 * HDFS-12792 to have complete unit tests.

Then there are a bunch of open topics:
 # Rebalancer of data across subclusters. We have some internal prototype based 
on DistCp that I shared with Wei Yan (we could also include moving blocks 
across blockpools). We could start a separate umbrella for this.
 # DNs interacting with the Routers. I recently opened HDFS-13098 to discuss 
this but this could.
 # Spreading a mount point across multiple mount points. This is similar to 
merge mount points and we have most of it working in production.{quote}
The #3 (*Spreading a mount point across multiple mount points*) mentioned in 
open topics has been implemented now (the doc of this (HDFS-13237) will be 
merged soon ). HDFS-12773 and HDFS-12792 are both merged.

Now there are two major works in phase 2:
 * RBF security tasks: HDFS-12284 and HDFS-13358.
 * DBMS State Store implementation: HDFS-13245.

[~elgoiri], I have some questions in my mind:
 * Besides this, any other thing we need to implement?
 * What's the next plan in RBF phase2?
 * What's the plan of RBF Rebalancer? It looks a useful tool for users.

> Router-based HDFS federation phase 2
> ------------------------------------
>                 Key: HDFS-12615
>                 URL: https://issues.apache.org/jira/browse/HDFS-12615
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Íñigo Goiri
>            Assignee: Íñigo Goiri
>            Priority: Major
>              Labels: RBF
> This umbrella JIRA tracks set of improvements over the Router-based HDFS 
> federation (HDFS-10467).

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