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https://issues.apache.org/jira/browse/HDFS-15664?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aihua Xu resolved HDFS-15664.
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Resolution: Duplicate
> Prevent Observer NameNode from becoming StandBy NameNode
> --------------------------------------------------------
>
> Key: HDFS-15664
> URL: https://issues.apache.org/jira/browse/HDFS-15664
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: auto-failover
> Affects Versions: 2.10.0
> Reporter: Aihua Xu
> Assignee: Aihua Xu
> Priority: Major
>
> When the cluster performs a failover from NN1 to NN2, NN2 is asking all the
> other NNs to cede active state and transit to StandBy including the Observer
> NameNodes.
> Seems we should block Observer from becoming StandBy and participating in
> Failover. Of course, since we can transit StandBy NameNode to Observer, we
> can separately support promote Observer NameNode to StandBy NameNode.
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