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https://issues.apache.org/jira/browse/HDFS-4861?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kihwal Lee updated HDFS-4861:
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Summary: BlockPlacementPolicyDefault does not consider decommissioning
racks (was: BlockPlacementPolicyDefault does not consider decommissioning
nodes)
> BlockPlacementPolicyDefault does not consider decommissioning racks
> -------------------------------------------------------------------
>
> 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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