Kihwal Lee created HDFS-5114:
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Summary: getMaxNodesPerRack() in BlockPlacementPolicyDefault does
not take decommissioning nodes into account.
Key: HDFS-5114
URL: https://issues.apache.org/jira/browse/HDFS-5114
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode
Affects Versions: 3.0.0, 2.1.0-beta
Reporter: Kihwal Lee
If a large proportion of data nodes are being decommissioned, one or more racks
may not be writable. However this is not taken into account when the default
block placement policy module invokes getMaxNodesPerRack(). Some blocks,
especially the ones with a high replication factor, may not be able to fully
replicated until those nodes are taken out of dfs.include. It can actually
block decommissioning itself.
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