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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10099) Reduce chance for RPC denial of service
Date Thu, 14 Nov 2013 19:29:21 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13822798#comment-13822798
] 

Steve Loughran commented on HADOOP-10099:
-----------------------------------------

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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