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https://issues.apache.org/jira/browse/HDFS-1974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13081900#comment-13081900
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Suresh Srinivas commented on HDFS-1974:
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bq. Using Sanjay's new support for mix-in RPC implementations, we can continue
to keep JournalProtocol separate, and only "mix it in" when starting up as the
BN.
Good idea. But you still need your active state to make the change, that Aaron
suggested.
> 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-1974.2.patch, HDFS-1974.3.patch,
> HDFS-1974.4.patch, HDFS-1974.5.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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