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From "Chao Sun (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-14067) Allow manual failover between standby and observer
Date Sun, 25 Nov 2018 22:18:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-14067?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16698340#comment-16698340
] 

Chao Sun commented on HDFS-14067:
---------------------------------

Thanks [~shv]!

> 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
>             Fix For: HDFS-12943
>
>         Attachments: HDFS-14067-HDFS-12943.000.patch, HDFS-14067-HDFS-12943.001.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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