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https://issues.apache.org/jira/browse/HDFS-2121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13086837#comment-13086837
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Koji Noguchi commented on HDFS-2121:
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Besides from performance, not sure how dfsclient/reader can be involved in
replicating the data without risking security. (or are we saying data is
replicated to the local datanode first and dfsclient reading out of that?)
> Add ability to create block replicas during off-switch reads
> ------------------------------------------------------------
>
> Key: HDFS-2121
> URL: https://issues.apache.org/jira/browse/HDFS-2121
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Arun C Murthy
>
> Idea: when a DFSClient reads an off-switch replica, we could tee an extra,
> temporal replica to the local DN if the NN thinks it makes sense.
> Then we could delete the ones which were part of the original 2 on the rack
> to rebalance or just rely on the balancer... all this would ensure better
> spread across the cluster. This would also help with hotspots on datasets.
> Thoughts?
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