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https://issues.apache.org/jira/browse/HDFS-13119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16361133#comment-16361133
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Íñigo Goiri commented on HDFS-13119:
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* Haven't been able to go too deep but it seems like killing the mini cluster
messes with the other unit tests.
* I think we could also test {{renewLease()}} to see if it succeeds when just
one nameservice is down; in addition, we may want to put metrics for the number
of retries and check them in the unit test.
* One thing I was considering was being able to try at least once if we don't
have an NN ACTIVE; something like setting {{retryCount}} to he max value -1.
* I think {{DFS_ROUTER_CLIENT_THREADS_SIZE_DEFAULT}} in {{DFSConfigKeys}} fits
in one line.
> RBF: Manage unavailable clusters
> --------------------------------
>
> Key: HDFS-13119
> URL: https://issues.apache.org/jira/browse/HDFS-13119
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Íñigo Goiri
> Assignee: Yiqun Lin
> Priority: Major
> Attachments: HDFS-13119.001.patch
>
>
> When a federated cluster has one of the subcluster down, operations that run
> in every subcluster ({{RouterRpcClient#invokeAll()}}) may take all the RPC
> connections.
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