Alexey Kovyrin created HDFS-5958:
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Summary: One very large node in a cluster prevents balancer from
balancing data
Key: HDFS-5958
URL: https://issues.apache.org/jira/browse/HDFS-5958
Project: Hadoop HDFS
Issue Type: Bug
Components: balancer
Affects Versions: 2.2.0
Environment: Hadoop cluster with 4 nodes: 3 with 500Gb drives and one
with 4Tb drive.
Reporter: Alexey Kovyrin
In a cluster with a set of small nodes and one much larger node balancer always
selects the large node as the target even though it already has a copy of each
block in the cluster.
This causes the balancer to enter an infinite loop and stop balancing other
nodes because each balancing iteration selects the same target and then could
not find a single block to move.
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