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https://issues.apache.org/jira/browse/HDFS-945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12829443#action_12829443
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Sharad Agarwal commented on HDFS-945:
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Some of the things like rate limiting is applicable to mapreduce as well, so I
assume to have it in the RPC layer, though there may be use cases to have
different limits for different operations.
> Make NameNode resilient to DoS attacks (malicious or otherwise)
> ---------------------------------------------------------------
>
> Key: HDFS-945
> URL: https://issues.apache.org/jira/browse/HDFS-945
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Reporter: Arun C Murthy
>
> We've seen defective applications cause havoc on the NameNode, for e.g. by
> doing 100k+ 'listStatus' on very large directories (60k files) etc.
> I'd like to start a discussion around how we prevent such, and possibly
> malicious applications in the future, taking down the NameNode.
> Thoughts?
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