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https://issues.apache.org/jira/browse/HDFS-3084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13246087#comment-13246087
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Aaron T. Myers commented on HDFS-3084:
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+1, the patch looks good to me. Good stuff, Todd.
> FenceMethod.tryFence() and ShellCommandFencer should pass namenodeId as well
> as host:port
> -----------------------------------------------------------------------------------------
>
> Key: HDFS-3084
> URL: https://issues.apache.org/jira/browse/HDFS-3084
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: ha
> Affects Versions: 0.24.0, 0.23.3
> Reporter: Philip Zeyliger
> Assignee: Todd Lipcon
> Attachments: hdfs-3084.txt
>
>
> The FenceMethod interface passes along the host:port of the NN that needs to
> be fenced. That's great for the common case. However, it's likely necessary
> to have extra configuration parameters for fencing, and these are typically
> keyed off the nameserviceId.namenodeId (if, for nothing else, consistency
> with all the other parameters that are keyed off of namespaceId.namenodeId).
> Obviously this can be backed out from the host:port, but it's inconvenient,
> and requires iterating through all the configs.
> The shell interface exhibits the same issue: host:port is great for most
> fencers, but if you need extra configs (like the host:port of the power
> supply unit), those are harder to pipe through without the namenodeId.
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