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https://issues.apache.org/jira/browse/HDFS-2121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13086825#comment-13086825
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Arun C Murthy commented on HDFS-2121:
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Allen, sorry if this wasn't clear.
There are clever ways to get around the DFSClient can be 'tricked' into
believing it's on the local DataNode by the NN which then is reading via a real
datanode and tee'ing it... I'm sure there are other creative ways. Thoughts?
> 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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