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https://issues.apache.org/jira/browse/HDFS-14998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16987138#comment-16987138
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Chao Sun commented on HDFS-14998:
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[~ferhui] without ZKFC running it is not quite useful to just run the DFS admin
command to transition the observer to SBN, since it won't be eligible for
failover unless you also launch the ZKFC on that host.
{quote}
The only benefit for running ZKFC on Observer NameNode is that it would join
election when the Observer NameNode is transitioned to Standby state.
{quote}
Yes this is correct.
{quote}
>From your words dynamic transition(between observer and standby) can be done
>only when ZKFC running on it. But i think dynamic transition can be done
>without ZKFC running. Please correct me, thanks.
{quote}
It can be done without ZKFC running, but with extra steps such as launching
ZKFC / shutting down ZKFC etc.
> Update Observer Namenode doc for ZKFC after HDFS-14130
> ------------------------------------------------------
>
> Key: HDFS-14998
> URL: https://issues.apache.org/jira/browse/HDFS-14998
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: documentation
> Affects Versions: 3.3.0
> Reporter: Fei Hui
> Assignee: Fei Hui
> Priority: Minor
> Attachments: HDFS-14998.001.patch, HDFS-14998.002.patch,
> HDFS-14998.003.patch
>
>
> After HDFS-14130, we should update observer namenode doc, observer namenode
> can run with ZKFC running
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