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https://issues.apache.org/jira/browse/HDFS-2121?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arun C Murthy updated HDFS-2121:
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Summary: Add ability to create block replicas during off-switch reads
(was: Add ability to create block replicas off non-rack reads)
> 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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