Íñigo Goiri commented on HDFS-13384:

[~ajayydv], thanks for the comments; tackled most of them in  
Regarding the subcluster0 being unavailable resulting in 2 DNs available, I 
also thought the same and that was my initial intention.
However, I the MiniDFSCluster topology for federated DNs, makes all DNs join 
all subclusters.
I tried to see if there was an easy way to tune that but I couldn't find it; we 
should add one easy way to set that setup up and using in the RBF tests.
Given this scenario, I kept the check when only subcluster0 is slow; once we 
have the new setup we can look for only 2 in that case (for now, I would keep 
that check for completeness).

> RBF: Improve timeout RPC call mechanism
> ---------------------------------------
>                 Key: HDFS-13384
>                 URL: https://issues.apache.org/jira/browse/HDFS-13384
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Íñigo Goiri
>            Assignee: Íñigo Goiri
>            Priority: Minor
>         Attachments: HDFS-13384.000.patch, HDFS-13384.001.patch
> When issuing RPC requests to subclusters, we have a time out mechanism 
> introduced in HDFS-12273. We need to improve this is handled.

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