[jira] [Updated] (HDFS-2121) Add ability to create block replicas during off-switch reads

["Arun C Murthy (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-2121?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Arun C Murthy updated HDFS-2121:
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> 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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