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https://issues.apache.org/jira/browse/HDFS-14201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16741525#comment-16741525
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He Xiaoqiao commented on HDFS-14201:
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[~surmountian] is it possible to check the namenode if in safemode when invoke
#transitionToActive? if that I consider it can cover both auto-failover by ZKFC
and manual transition to active. FYI.
> Ability to disallow safemode NN to become active
> ------------------------------------------------
>
> Key: HDFS-14201
> URL: https://issues.apache.org/jira/browse/HDFS-14201
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: auto-failover
> Affects Versions: 3.1.1, 2.9.2
> Reporter: Xiao Liang
> Assignee: Xiao Liang
> Priority: Major
>
> Currently with HA, Namenode in safemode can be possibly selected as active,
> for availability of both read and write, Namenodes not in safemode are better
> choices to become active though.
> It can take tens of minutes for a cold started Namenode to get out of
> safemode, especially when there are large number of files and blocks in HDFS,
> that means if a Namenode in safemode become active, the cluster will be not
> fully functioning for quite a while, even if it can while there is some
> Namenode not in safemode.
> The proposal here is to add an option, to allow Namenode to report itself as
> UNHEALTHY to ZKFC, if it's in safemode, so as to only allow fully functioning
> Namenode to become active, improving the general availability of the cluster.
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