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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2141) Remove NameNode roles Active and Standby
Date Fri, 15 Jul 2011 22:14:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13066249#comment-13066249
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Aaron T. Myers commented on HDFS-2141:
--------------------------------------

+1, this patch looks good to me. If you care to, you might want to line up the indentation
of ("NameNode") with the other members of {{NameNodeRole}}, but no reason to make another
patch for it.

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.

> 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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