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https://issues.apache.org/jira/browse/HADOOP-8007?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon updated HADOOP-8007:
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Attachment: hadoop-8007.txt
Attached patch changes the configuration of the fencing script as follows:
By default, no arguments are passed to the script. This is different than the
previous implementation, but since HA hasn't been in a release yet, I think
it's fine to break this.
Instead, users are expected to use the environment to choose whatever arguments
they need. Since we pass the shell command through to bash, environment
variables are interpolated.
We already handled passing the configuration through. This patch also adds the
ability for an HAServiceTarget to add additional key/value pairs, which are
prefixed with {{target_}} in the environment. The three passed by the Common
code are {{$target_host}}, {{$target_port}}, and {{$target_address}} (which is
the same as host:port).
HDFS-3084 will add the NNID and NSID to this map.
I will also file a separate JIRA to update the docs, which unfortunately live
in the MapReduce project.
> HA: use substitution token for fencing argument
> -----------------------------------------------
>
> Key: HADOOP-8007
> URL: https://issues.apache.org/jira/browse/HADOOP-8007
> Project: Hadoop Common
> Issue Type: Improvement
> Components: ha
> Affects Versions: 2.0.0
> Reporter: Aaron T. Myers
> Assignee: Todd Lipcon
> Attachments: hadoop-8007.txt
>
>
> Per HADOOP-7983 currently the fencer always passes the target host:port to
> fence as the first argument to the fence script, it would be better to use a
> substitution token. That is to say, the user would configure "myfence.sh
> $TARGETHOST foo bar" and Hadoop would substitute the target. This would allow
> use of pre-existing scripts that might have a different ordering of arguments
> without a wrapper.
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