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From "Aaron T. Myers (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3084) FenceMethod.tryFence() and ShellCommandFencer should pass namenodeId as well as host:port
Date Wed, 04 Apr 2012 07:13:19 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13246087#comment-13246087

Aaron T. Myers commented on HDFS-3084:

+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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