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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6397) NN shows inconsistent value in deadnode count
Date Fri, 16 May 2014 14:27:15 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13999828#comment-13999828
] 

Kihwal Lee commented on HDFS-6397:
----------------------------------

The patch looks good. I manually kicked precommit. https://builds.apache.org/job/PreCommit-HDFS-Build/6917/

> 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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