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https://issues.apache.org/jira/browse/HDFS-14927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16958293#comment-16958293
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Íñigo Goiri commented on HDFS-14927:
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{{ConnectionManager#getJSON()}} alrerady oputputs the number of active threads
for each pool.
This is exposed through FederationRPCMetrics if I'm not wrong.
> RBF: Add metrics for active RPC client threads
> ----------------------------------------------
>
> Key: HDFS-14927
> URL: https://issues.apache.org/jira/browse/HDFS-14927
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: rbf
> Reporter: Leon Gao
> Assignee: Leon Gao
> Priority: Minor
>
> It is good to add some monitoring on the active RPC client threads, so we
> know the utilization and when to bump up
> `dfs.federation.router.client.thread-size`
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