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https://issues.apache.org/jira/browse/HDFS-13274?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17117924#comment-17117924
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Íñigo Goiri commented on HDFS-13274:
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The stats overall look pretty high, the main issues I see:
* GetServerDefaults: this goes to all the NNs, so a slow NN will hog this for
longer.
* RenewLease: Similar to get server defaults.
* GetListing: What does your mount table look like?
You really need to do some profiling on the Router to see what the connections
are doing.
I can't remember right away but there were JMX metrics (FederationRPC) to see
how many connections were there in parallel and overall (FederationRPCMetrics).
> RBF: Extend RouterRpcClient to use multiple sockets
> ---------------------------------------------------
>
> Key: HDFS-13274
> URL: https://issues.apache.org/jira/browse/HDFS-13274
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Íñigo Goiri
> Assignee: Íñigo Goiri
> Priority: Major
>
> HADOOP-13144 introduces the ability to create multiple connections for the
> same user and use different sockets. The RouterRpcClient should use this
> approach to get a better throughput.
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