zhangshuyan0 opened a new pull request, #5715:
URL: https://github.com/apache/hadoop/pull/5715
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### Description of PR
When we run balancer with `BalancingPolicy.Node` policy, our goal is to make
each datanode storage balanced. But in the current implementation, the balancer
doesn't account for storage used by non-dfs on the datanodes, which can make
the situation worse for datanodes that are already strained on storage.
### How was this patch tested?
Add a new UT.
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