Mohammad Kamrul Islam created HDFS-6397:
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Summary: 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
Reporter: Mohammad Kamrul Islam
Assignee: Mohammad Kamrul Islam
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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