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https://issues.apache.org/jira/browse/HDFS-1875?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13050130#comment-13050130
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Hudson commented on HDFS-1875:
------------------------------
Integrated in Hadoop-Hdfs-trunk-Commit #746 (See
[https://builds.apache.org/job/Hadoop-Hdfs-trunk-Commit/746/])
> MiniDFSCluster hard-codes dfs.datanode.address to localhost
> -----------------------------------------------------------
>
> Key: HDFS-1875
> URL: https://issues.apache.org/jira/browse/HDFS-1875
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: test
> Affects Versions: 0.22.0
> Reporter: Eric Payne
> Assignee: Eric Payne
> Fix For: 0.23.0
>
> Attachments: HDFS-1875.patch, HDFS-1875.patch
>
>
> When creating RPC addresses that represent the communication sockets for each
> simulated DataNode, the MiniDFSCluster class hard-codes the address of the
> dfs.datanode.address port to be "127.0.0.1:0"
> The DataNodeCluster test tool uses the MiniDFSCluster class to create a
> selected number of simulated datanodes on a single host. In the
> DataNodeCluster setup, the NameNode is not simulated but is started as a
> separate daemon.
> The problem is that if the write requrests into the simulated datanodes are
> originated on a host that is not the same host running the simulated
> datanodes, the connections are refused. This is because the RPC sockets that
> are started by MiniDFSCluster are for "localhost" (127.0.0.1) and are not
> accessible from outside that same machine.
> It is proposed that the MiniDFSCluster.setupDatanodeAddress() method be
> overloaded in order to accommodate an environment where the NameNode is on
> one host, the client is on another host, and the simulated DataNodes are on
> yet another host (or even multiple hosts simulating multiple DataNodes each).
> The overloaded API would add a parameter that would be used as the basis for
> creating the RPS sockets. By default, it would remain 127.0.0.1
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