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https://issues.apache.org/jira/browse/HADOOP-6359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14317082#comment-14317082
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Tsz Wo Nicholas Sze commented on HADOOP-6359:
---------------------------------------------
Rakesh, thanks for pointing it out. This was fixed as a part of HDFS-5939.
> NetworkTopology.chooseRandom(..) throws an IllegalArgumentException
> -------------------------------------------------------------------
>
> Key: HADOOP-6359
> URL: https://issues.apache.org/jira/browse/HADOOP-6359
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Tsz Wo Nicholas Sze
> Labels: newbie
>
> When numOfDatanodes == 0, NetworkTopology.chooseRandom(..) throws an
> IllegalArgumentException.
> {noformat}
> 2009-09-30 00:12:50,768 ERROR org.mortbay.log: /nn_browsedfscontent.jsp
> java.lang.IllegalArgumentException: n must be positive
> at java.util.Random.nextInt(Random.java:250)
> at
> org.apache.hadoop.net.NetworkTopology.chooseRandom(NetworkTopology.java:536)
> at
> org.apache.hadoop.net.NetworkTopology.chooseRandom(NetworkTopology.java:504)
> ...
> {noformat}
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