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Posted to hdfs-dev@hadoop.apache.org by "Aihua Xu (Jira)" <ji...@apache.org> on 2020/11/02 17:32:00 UTC

[jira] [Created] (HDFS-15664) Prevent Observer NameNode from becoming StandBy NameNode

Aihua Xu created HDFS-15664:
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             Summary: 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


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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