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https://issues.apache.org/jira/browse/HADOOP-10099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13822798#comment-13822798
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Steve Loughran commented on HADOOP-10099:
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The risk for the NN is that something malicious sends lots of requests that
need to lock the metadata -renames spring to mind-
> Reduce chance for RPC denial of service
> ---------------------------------------
>
> Key: HADOOP-10099
> URL: https://issues.apache.org/jira/browse/HADOOP-10099
> Project: Hadoop Common
> Issue Type: Improvement
> Components: ipc
> Affects Versions: 2.0.0-alpha, 3.0.0
> Reporter: Daryn Sharp
> Priority: Minor
>
> A RPC server may accept an unlimited number of connections unless indirectly
> bounded by a blocking operation in the RPC handler threads. The NN's
> namespace locking happens to cause this blocking, but other RPC servers such
> as yarn's generate async events which allow unbridled connection acceptance.
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