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https://issues.apache.org/jira/browse/HDFS-1974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13070899#comment-13070899
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Todd Lipcon commented on HDFS-1974:
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I opened HDFS-2197 to refactor the RPC implementations to a new class
> 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-1974.1.patch, 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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