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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4861) BlockPlacementPolicyDefault does not consider decommissioning nodes
Date Tue, 28 May 2013 20:53:20 GMT
Kihwal Lee created HDFS-4861:
--------------------------------

             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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