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From "Trevor Lorimer (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-5216) NumDecomDeadDataNodes not returning correct number of dead decommissioned nodes
Date Tue, 17 Sep 2013 15:51:52 GMT
Trevor Lorimer created HDFS-5216:

             Summary: NumDecomDeadDataNodes not returning correct number of dead decommissioned
                 Key: HDFS-5216
                 URL: https://issues.apache.org/jira/browse/HDFS-5216
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 2.1.0-beta
            Reporter: Trevor Lorimer

For HDFS-4860 I essentially copied the process in NamenodejspHelper.generateHealthReport(),
so it would be in sync with the original dfsHealth.jsp.

However looking at this now there may be a bug? in getNumDecomDeadDataNodes(), where:
    getBlockManager().getDatanodeManager().fetchDatanodes(dead, null, true);
Where the parameter true indicates that decommissioned nodes should be removed from the list.

If the flag is true fetchDatanodes calls removeDecomNodeFromList, which will remove a node
if an existing datanode does not appear in both include or exclude lists and it has been decommissioned.

If I am looking to return the Number of Dead Decommissioned Nodes, should I change the remove
decommissioned nodes flag to False? i.e.:
    getBlockManager().getDatanodeManager().fetchDatanodes(null, dead, false);

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