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https://issues.apache.org/jira/browse/HDFS-14601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16897613#comment-16897613
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Fengnan Li edited comment on HDFS-14601 at 7/31/19 11:18 PM:
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During ZKFC launch, it needs to initialize a localTarget which is the namenode
which runs at the same host this ZKFC runs. Right now this logic is done by
looping through all namenode hosts, create a socket address and match this
socket address with the local socket address. This doesn't work with DNS since
current code will only resolve to one address, which could be the other
namenode instead of the local one, thus ZKFC wouldn't be able to get a
localTarget.
We can change the logic to make it work with DNS. [~elgoiri] What's your
thought? The code is in DFSUtil.java#getSuffixIDs()
was (Author: fengnanli):
During ZKFC launch, it needs to initialize a localTarget which is the namenode
which runs at the same host this ZKFC runs. Right now this logic is done by
looping through all namenode hosts, create a socket address and match this
socket address with the local socket address. This doesn't work with DNS since
current code will only resolve to one address, which could be the other
namenode instead of the local one, thus ZKFC wouldn't be able to get a
localTarget.
We can change the logic to make it work with DNS but I am not sure it is worth
the effort. [~elgoiri] What's your thought? The code is in
DFSUtil.java#getSuffixIDs()
> 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
> Assignee: Fengnan Li
> 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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