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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