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https://issues.apache.org/jira/browse/HDFS-15096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17010138#comment-17010138
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Íñigo Goiri commented on HDFS-15096:
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I was thinking on veryfying that the NameNode method was only called once
within the caching period.
It might be a little overkill but I leave it up to you.
> RBF : GetServerDefaults Should be Cached At Router
> --------------------------------------------------
>
> Key: HDFS-15096
> URL: https://issues.apache.org/jira/browse/HDFS-15096
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Ayush Saxena
> Assignee: Ayush Saxena
> Priority: Major
> Attachments: HDFS-15096-01.patch
>
>
> Presently each getServerDefault calls are triggered to the Namespace, The
> DFSClient caches the getServerDefaults(), similarly the Router can also cache
> the getServerDefaults(), as router connects to multiple clients, this
> improves performance for subsequent calls.
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