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https://issues.apache.org/jira/browse/HDFS-14927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16962457#comment-16962457
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Íñigo Goiri commented on HDFS-14927:
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I think I'm missing how this call of renewLease() is done in the background.
>From what I can understand here, this will trigger a call in the background
>but then wait half a second.
By the time the sleep finishes, the call to renewLease() should already be
finished.
Making it synchronous would be the same and you would still have an active one
because the Router leaves the threads on for some time.
> RBF: Add metrics for async callers thread pool
> ----------------------------------------------
>
> 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
> Attachments: HDFS-14927.001.patch, HDFS-14927.002.patch,
> HDFS-14927.003.patch, HDFS-14927.004.patch, HDFS-14927.005.patch
>
>
> It is good to add some monitoring on the async caller thread pool to handle
> fan-out RPC client requests, so we know the utilization and when to bump up
> dfs.federation.router.client.thread-size
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