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https://issues.apache.org/jira/browse/HDFS-14998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16983923#comment-16983923
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Ayush Saxena commented on HDFS-14998:
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I don't object or say remove the support for having ZKFC running on ONN. Its
there, I am just saying for a normal deployment, Just the "Apache Hadoop" where
an Observer can not participate in ZKFC and there isn't any external help
there, he doesn't need to have to get ZKFC running for the most of the time and
let a burden of a process running.
if someone has the scripts or alarms as you suggest, he may turn the ZKFC on,
thats why we have supported the featggure in. My point is in a basic
deployment(Where not all people have the scripts transitioning ONN to standby
dynamically), they don't need to turn the ZKFC on as a compulsion as they would
do in a basic HA setup.
We are just giving a suggestion that ONN will not participate in automatic
failover so, you may not need to turn it up in general. If someone has a
usecase as yours he is free to do that, Suggestions are in genreal not for
specific cases. Even we don't keep on switching from ONN to SNN in any such way.
> 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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