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Posted to hdfs-dev@hadoop.apache.org by "Aihua Xu (Jira)" <ji...@apache.org> on 2020/11/02 22:36:00 UTC
[jira] [Resolved] (HDFS-15664) Prevent Observer NameNode from
becoming StandBy NameNode
[ https://issues.apache.org/jira/browse/HDFS-15664?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Aihua Xu resolved HDFS-15664.
-----------------------------
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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