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https://issues.apache.org/jira/browse/HDFS-15404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17134625#comment-17134625
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Konstantin Shvachko commented on HDFS-15404:
--------------------------------------------
This is particularly important for IPFailover with more than 2 NameNodes, which
is currently limited to exactly 2 NNs and work under the assumption that if
this node is Standby than the other must be Active. In multi-NN mode there are
more than one other nodes that can become active.
> ShellCommandFencer should expose info about source
> --------------------------------------------------
>
> Key: HDFS-15404
> URL: https://issues.apache.org/jira/browse/HDFS-15404
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Chen Liang
> Assignee: Chen Liang
> Priority: Major
>
> Currently the HA fencing logic in ShellCommandFencer exposes environment
> variable about only the fencing target. i.e. the $target_* variables as
> mentioned in this [document
> page|https://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-hdfs/HDFSHighAvailabilityWithQJM.html]).
>
> But here only the fencing target variables are getting exposed. Sometimes it
> is useful to expose info about the fencing source node. One use case is would
> allow source and target node to identify themselves separately and run
> different commands/scripts.
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