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https://issues.apache.org/jira/browse/HDFS-14067?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16687092#comment-16687092
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Chao Sun commented on HDFS-14067:
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I think option 2 is more or less what we were trying with patch v0? although
the solution seems to be hard code a {{--forcemanual}} flag with the
{{-transitionToObserver}} command, which is different from the patch.
IMHO we'd better to go with option 1 for now, since {{--transitionToObserver}}
at the moment does carry certain risk as the observer may get elected to active
later, and it's better to let user be aware of this. We can remove the
{{-forcemanual}} requirement later once we figured out HDFS-13182.
> Allow manual failover between standby and observer
> --------------------------------------------------
>
> Key: HDFS-14067
> URL: https://issues.apache.org/jira/browse/HDFS-14067
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Chao Sun
> Assignee: Chao Sun
> Priority: Major
> Attachments: HDFS-14067-HDFS-12943.000.patch
>
>
> Currently if automatic failover is enabled in a HA environment, transition
> from standby to observer would be blocked:
> {code}
> [hdfs@*** hadoop-3.3.0-SNAPSHOT]$ bin/hdfs haadmin -transitionToObserver ha2
> Automatic failover is enabled for NameNode at ****
> Refusing to manually manage HA state, since it may cause
> a split-brain scenario or other incorrect state.
> If you are very sure you know what you are doing, please
> specify the --forcemanual flag.
> {code}
> We should allow manual transition between standby and observer in this case.
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