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https://issues.apache.org/jira/browse/HDFS-1974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13068086#comment-13068086
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Suresh Srinivas commented on HDFS-1974:
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> It is the same notion to me. NameNode in current implementation cannot
> transition from one role to another. But in HA world it should.
I think we are discussing this in HDFS-2141. Lets continue there.
> 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
> Attachments: HDFS-1974.patch
>
>
> 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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