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https://issues.apache.org/jira/browse/HDFS-14998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16984125#comment-16984125
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Fei Hui commented on HDFS-14998:
--------------------------------
[~csun] [~ayushtkn]Thanks for your comments
{quote}
ZKFC does not need to be turned on the Observer NameNode unless transition
between between Observer and Standby is required in your cluster
{quote}
{quote}
the only benefit for running ZKFC on Observer NameNode is to enable dynamic
transition from Observer to Standby role (which will then automatically join
the Zookeeper controlled failover group) and vise versa.
{quote}
I'm confused about these comments, right now ZKFC is for dynamic transition
between active and standby.
HDFS-14130 aims to prevent observer from commanding Obserbers to transition to
SBN and participating in ANN election.
I think maybe we should change it to following
{quote}
ZKFC does not need to be turned on the Observer NameNode unless dynamic
transition between Active and Standby is required in your cluster after you
transition Observer to Standby.
{quote}
{quote}
the only benefit for running ZKFC on Observer NameNode is to enable dynamic
transition between Active
and Standby after you transition Observer to Standby role (which will then
automatically join the Zookeeper controlled failover group).
{quote}
[~csun][~ayushtkn] Pls let me know whether it is correct. Thanks
> 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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