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Posted to hdfs-issues@hadoop.apache.org by "Konstantin Shvachko (JIRA)" <ji...@apache.org> on 2011/07/19 23:08:58 UTC

[jira] [Commented] (HDFS-1974) HA: Introduce active and standby states to the namenode

    [ https://issues.apache.org/jira/browse/HDFS-1974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13067967#comment-13067967 ] 

Konstantin Shvachko commented on HDFS-1974:
-------------------------------------------

Namenode does not have "secondary" role.

> Note that this is different from the existing notion of namenode role

It is the same notion to me. NameNode in current implementation cannot transition from one role to another. But in HA world it should.

> HA: Introduce active and standby states to the namenode
> -------------------------------------------------------
>
>                 Key: HDFS-1974
>                 URL: https://issues.apache.org/jira/browse/HDFS-1974
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: name-node
>            Reporter: Suresh Srinivas
>            Assignee: Suresh Srinivas
>
> Currently namenode supports active, secondary and backup roles. To support namenode high availability, active and standby states are needed. Note that this is different from the existing notion of namenode role, where a namenode cannot transition from one role to the other.

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