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Posted to hdfs-dev@hadoop.apache.org by "Kihwal Lee (JIRA)" <ji...@apache.org> on 2013/05/28 22:53:20 UTC

[jira] [Created] (HDFS-4861) BlockPlacementPolicyDefault does not consider decommissioning nodes

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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