Kihwal Lee created HDFS-4861:
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Summary: BlockPlacementPolicyDefault does not consider
decommissioning nodes
Key: HDFS-4861
URL: https://issues.apache.org/jira/browse/HDFS-4861
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode
Affects Versions: 0.23.7, 2.0.5-beta
Reporter: Kihwal Lee
getMaxNodesPerRack() calculates the max replicas/rack like this:
{code}
int maxNodesPerRack = (totalNumOfReplicas-1)/clusterMap.getNumOfRacks()+2;
{code}
Since this does not consider the racks that are being decommissioned and the
decommissioning state is only checked later in isGoodTarget(), certain blocks
are not replicated even when there are many racks and nodes.
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