[HDFS-6122] Rebalance cached replicas between datanodes

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.3.0
• Component/s: caching
• Assignee: Andrew Wang
• Reporter: Andrew Wang
• Created: 19/Mar/14 01:46
• Updated: 06/Jan/17 22:09

Description

It'd be nice if the NameNode was able to rebalance cache usage among datanodes. This would help avoid situations where the only three DNs with a replica are full and there is still cache space on the rest of the cluster. It'll also probably help for heterogeneous node sizes and when adding new nodes to the cluster or doing a rolling restart.