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https://issues.apache.org/jira/browse/HDFS-6376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15007804#comment-15007804
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Tsz Wo Nicholas Sze commented on HDFS-6376:
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> ... Users can use a new configuration property "dfs.internal.nameservices" to
> explicitly specify the name services belonging to the local cluster, while
> continue using the configuration property "dfs.nameservices" to specify all
> the name services in the local and remote clusters.
Is this an incompatible change? Balancer does not work with such setting since
it will use all the NN specified in dfs.nameservices. As a result, it will try
to balance both the local and the remote clusters.
> Distcp data between two HA clusters requires another configuration
> ------------------------------------------------------------------
>
> Key: HDFS-6376
> URL: https://issues.apache.org/jira/browse/HDFS-6376
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode, federation, hdfs-client
> Affects Versions: 2.2.0, 2.3.0, 2.4.0
> Environment: Hadoop 2.3.0
> Reporter: Dave Marion
> Assignee: Dave Marion
> Fix For: 2.6.0
>
> Attachments: HDFS-6376-2.patch, HDFS-6376-3-branch-2.4.patch,
> HDFS-6376-4-branch-2.4.patch, HDFS-6376-5-trunk.patch,
> HDFS-6376-6-trunk.patch, HDFS-6376-7-trunk.patch, HDFS-6376-branch-2.4.patch,
> HDFS-6376-patch-1.patch, HDFS-6376.000.patch, HDFS-6376.008.patch,
> HDFS-6376.009.patch, HDFS-6376.010.patch, HDFS-6376.011.patch
>
>
> User has to create a third set of configuration files for distcp when
> transferring data between two HA clusters.
> Consider the scenario in [1]. You cannot put all of the required properties
> in core-site.xml and hdfs-site.xml for the client to resolve the location of
> both active namenodes. If you do, then the datanodes from cluster A may join
> cluster B. I can not find a configuration option that tells the datanodes to
> federate blocks for only one of the clusters in the configuration.
> [1]
> http://mail-archives.apache.org/mod_mbox/hadoop-user/201404.mbox/%3CBAY172-W2133964E0C283968C161DD1520%40phx.gbl%3E
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