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https://issues.apache.org/jira/browse/HDFS-6397?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mohammad Kamrul Islam updated HDFS-6397:
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Attachment: HDFS-6397.2.patch
Thanks [~kihwal] for the review and suggestion.
uploaded the new patch.
I also prefer if we can make it to 2.4.1.
> NN shows inconsistent value in deadnode count
> ----------------------------------------------
>
> Key: HDFS-6397
> URL: https://issues.apache.org/jira/browse/HDFS-6397
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.4.1
> Reporter: Mohammad Kamrul Islam
> Assignee: Mohammad Kamrul Islam
> Priority: Critical
> Attachments: HDFS-6397.1.patch, HDFS-6397.2.patch
>
>
> Context:
> When NN is started , without any live datanode but there are nodes in the
> dfs.includes, NN shows the deadcount as '0'.
> There are two inconsistencies:
> 1. If you click on deadnode links (which shows the count is 0), it will
> display the list of deadnodes correctly.
> 2. hadoop 1.x used to display the count correctly.
> The following snippets of JMX response will explain it further:
> Look at the value of "NumDeadDataNodes"
> {noformat}
> {
> "name" : "Hadoop:service=NameNode,name=FSNamesystemState",
> "modelerType" : "org.apache.hadoop.hdfs.server.namenode.FSNamesystem",
> "CapacityTotal" : 0,
> "CapacityUsed" : 0,
> ...
> "NumLiveDataNodes" : 0,
> "NumDeadDataNodes" : 0,
> "NumDecomLiveDataNodes" : 0,
> "NumDecomDeadDataNodes" : 0,
> "NumDecommissioningDataNodes" : 0,
> "NumStaleDataNodes" : 0
> },
> {noformat}
> Look at " "DeadNodes"".
> {noformat}
> {
> "name" : "Hadoop:service=NameNode,name=NameNodeInfo",
> "modelerType" : "org.apache.hadoop.hdfs.server.namenode.FSNamesystem",
>
> ....
> "TotalBlocks" : 70,
> "TotalFiles" : 129,
> "NumberOfMissingBlocks" : 0,
> "LiveNodes" : "{}",
> "DeadNodes" :
> "{\"<MMMMM>.linkedin.com\":{\"lastContact\":1400037397,\"decommissioned\":false,\"xferaddr\":\"172.XX.X.XX:71\"},\"<NNNNN>.linkedin.com\":{\"lastContact\":1400037397,\"decommissioned\":false,\"xferaddr\":\"172.XX.XX.XX:71\"}}",
> "DecomNodes" : "{}",
> .....
> }
> {noformat}
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