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https://issues.apache.org/jira/browse/HADOOP-7424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13159245#comment-13159245
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Hudson commented on HADOOP-7424:
--------------------------------
Integrated in Hadoop-Mapreduce-0.23-Build #108 (See
[https://builds.apache.org/job/Hadoop-Mapreduce-0.23-Build/108/])
HADOOP-7863: apply HADOOP-7424 to 0.23.1
stevel : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1207611
Files :
*
/hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/CHANGES.txt
*
/hadoop/common/branches/branch-0.23/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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