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https://issues.apache.org/jira/browse/HDFS-2148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13065090#comment-13065090
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Suresh Srinivas commented on HDFS-2148:
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I will followup on this. Some of the TODO:FEDERATION may not be easy to solve,
especially the thread per du, which is only a problem with very large number of
namenodes in the cluster.
> Address all the federation TODOs
> --------------------------------
>
> Key: HDFS-2148
> URL: https://issues.apache.org/jira/browse/HDFS-2148
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: name-node
> Reporter: Eli Collins
> Fix For: 0.23.0
>
>
> The federation merge introduced a bunch of todos marked "TODO:FEDERATION" and
> "TODO". We should have jiras for these and address the issues.
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