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Posted to hdfs-dev@hadoop.apache.org by "Arun C Murthy (JIRA)" <ji...@apache.org> on 2011/07/01 08:50:29 UTC

[jira] [Created] (HDFS-2121) Add ability to create block replicas off non-rack reads

Add ability to create block replicas off non-rack reads
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                 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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