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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7424) Log an error if the topology script doesn't handle multiple args
Date Fri, 28 Oct 2011 03:01:41 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13137958#comment-13137958

Hudson commented on HADOOP-7424:

Integrated in Hadoop-Common-trunk-Commit #1182 (See [https://builds.apache.org/job/Hadoop-Common-trunk-Commit/1182/])
    HADOOP-7424. Log an error if the topology script doesn't handle multiple args. Contributed
by Uma Maheswara Rao G

eli : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1190139
Files : 
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/CHANGES.txt
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/ScriptBasedMapping.java

> 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: 0.24.0
>         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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