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https://issues.apache.org/jira/browse/HDFS-2141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13067382#comment-13067382
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Suresh Srinivas commented on HDFS-2141:
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The only concern I have is - the metrics is started with current
NamenodeRole.ACTIVE. This one changes it to NamenodeRole.NAMENODE. Hence I was
waiting for committing this to HDFS-1623 branch. The metrics thing would become
clear as we implement more of HA functionality. Any comments?
> We might even consider merging HdfsConstants.NodeType and
> HdfsConstants.NameNodeRole, since being a DN is certainly mutually exclusive
> with all of the NameNodeRoles, but that should probably be done as a separate
> JIRA.
I like this. We could just have NodeType with NameNode, DataNode, Backup and
Checkpointer?
> Remove NameNode roles Active and Standby
> ----------------------------------------
>
> Key: HDFS-2141
> URL: https://issues.apache.org/jira/browse/HDFS-2141
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: name-node
> Reporter: Suresh Srinivas
> Assignee: Suresh Srinivas
> Attachments: HDFS-2141.patch
>
>
> In HDFS, following roles are supported in NameNodeRole: ACTIVE, BACKUP,
> CHECKPOINT and STANDBY.
> Active and Standby are the state of the NameNode. While Backup and CheckPoint
> are the name/role of the daemons that are started. This mixes up the run time
> state of NameNode with the daemon role. I propose changing the NameNodeRole
> to: NAMENODE, BACKUP, CHECKPOINT. HDFS-1974 will introduce the states active
> and standby to the daemon that is running in the role NAMENODE.
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