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https://issues.apache.org/jira/browse/HADOOP-6616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13470873#comment-13470873
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Joep Rottinghuis commented on HADOOP-6616:
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Perhaps you can add a few words about <code>topology.script.number.args<code>
which IIRC defaults to 100 and drives the number of host IPs passed to the
script in one go, to allow the script to do some internal caching. When set to
1 then a process will be spawned to invoke the script for each host.
You describe how the rack awareness works. Would it be useful to add a sentence
or two about why this is used (ie. block placement uses rack awareness for
fault tolerance)?
> Improve documentation for rack awareness
> ----------------------------------------
>
> Key: HADOOP-6616
> URL: https://issues.apache.org/jira/browse/HADOOP-6616
> Project: Hadoop Common
> Issue Type: Improvement
> Components: documentation
> Reporter: Jeff Hammerbacher
> Labels: newbie
> Attachments: hadoop-6616.patch
>
>
> The current documentation for rack awareness
> (http://hadoop.apache.org/common/docs/r0.20.0/cluster_setup.html#Hadoop+Rack+Awareness)
> should be augmented to include a sample script.
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