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https://issues.apache.org/jira/browse/HDFS-14601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16894009#comment-16894009
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Fengnan Li commented on HDFS-14601:
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[~kkori] I don't think this usage is supported by DNS. DNS was mainly used by
HDFS/Router clients for accessing the cluster, not an internal service
discovery for now since that needs the users (zkfc) here to discover NN.
I will go to ZKFC code and come back later.
I feel like I need to have the usage doc written sooner to help the community.
Internally we make Yarn use DNS to routers and it works fine.
> NameNode HA with single DNS record for NameNode discovery prevent running ZKFC
> ------------------------------------------------------------------------------
>
> Key: HDFS-14601
> URL: https://issues.apache.org/jira/browse/HDFS-14601
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Kei Kori
> Priority: Major
>
> ZKFC seems not treat one DNS record for NameNode discovery as multiple
> NameNodes, so launching ZKFC is blocked on NameNodes which has only one
> "dfs.ha.namenodes" definition with DNS for resolving multiple NameNodes.
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