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https://issues.apache.org/jira/browse/HADOOP-8227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13247468#comment-13247468
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Robert Joseph Evans commented on HADOOP-8227:
---------------------------------------------

Yes, that is the exact issue.  As part of this change I modified the RpcEngine 
interface.  In trunk and branch-2 all implementations of RpcEngine are in 
common, but in 0.23 ProtoOverHadoopRpcEngine is in MapReduce so the fix has to 
be split.  I think it is simpler to get the code changes approved and into 
trunk/branch-2 first and then put in the branch-23 patch at once, instead of 
splitting them up.
                
> Allow RPC to limit ephemeral port range.
> ----------------------------------------
>
>                 Key: HADOOP-8227
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8227
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 0.23.2
>            Reporter: Robert Joseph Evans
>            Assignee: Robert Joseph Evans
>            Priority: Blocker
>         Attachments: HADOOP-8227-trunk.txt
>
>
> This is a sub task of MAPREDUCE-4079.  For security reasons we would like to 
> limit the range of ports that are used when some RPC servers select a port.

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