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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2141) Remove NameNode roles Active and Standby
Date Mon, 18 Jul 2011 23:16:57 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13067382#comment-13067382

Suresh Srinivas commented on HDFS-2141:

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

> 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
> 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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