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From "Arun C Murthy (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-7424) Log an error if the topology script doesn't handle multiple args
Date Wed, 08 Feb 2012 00:21:03 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-7424?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Arun C Murthy updated HADOOP-7424:
----------------------------------

    Fix Version/s:     (was: 0.24.0)
                   0.23.1
    
> Log an error if the topology script doesn't handle multiple args
> ----------------------------------------------------------------
>
>                 Key: HADOOP-7424
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7424
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Eli Collins
>            Assignee: Uma Maheswara Rao G
>              Labels: newbie
>             Fix For: 0.23.1
>
>         Attachments: HADOOP-7424.patch
>
>
> ScriptBasedMapping#resolve currently warns and returns null if it passes n arguments
to the topology script and gets back a different number of resolutions. This indicates a bug
in the topology script (or it's input) and therefore should be an error.
> {code}
> // invalid number of entries returned by the script
> LOG.warn("Script " + scriptName + " returned "
>    + Integer.toString(m.size()) + " values when "
>    + Integer.toString(names.size()) + " were expected.");
> return null;
> {code}
> There's only one place in Hadoop (FSNamesystem init) where we pass multiple arguments
to the topology script, and it only done for performance (to trigger resolution/caching of
all the hosts in the includes file on startup). So currently a topology script that doesn't
handle multiple arguments just means the initial cache population doesn't work.

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