Trevor Lorimer created HDFS-5216:
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Summary: NumDecomDeadDataNodes not returning correct number of
dead decommissioned nodes
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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