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https://issues.apache.org/jira/browse/HDFS-1274?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12883598#action_12883598
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Todd Lipcon commented on HDFS-1274:
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Is this for TCP-level QoS? (eg using linux traffic shaping to balance bandwidth
allocations?)
> ability to send replication traffic on a separate port to the Datanode
> ----------------------------------------------------------------------
>
> Key: HDFS-1274
> URL: https://issues.apache.org/jira/browse/HDFS-1274
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: data-node
> Reporter: dhruba borthakur
>
> The datanode receives data from a client write request or from a replication
> request. It is useful to configure the cluster to so that dedicated bandwidth
> is allocated for client writes and replication traffic. This requires that
> the client-writes and replication traffic be configured to operate on two
> different ports to the datanode.
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