[HADOOP-6359] NetworkTopology.chooseRandom(..) throws an IllegalArgumentException

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Labels: newbie
• Assignee: Unassigned
• Reporter: Tsz-wo Sze
• Created: 03/Nov/09 20:16
• Updated: 11/Feb/15 22:14
• Resolved: 11/Feb/15 22:14

Description

When numOfDatanodes == 0, NetworkTopology.chooseRandom(..) throws an IllegalArgumentException.

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)
        ...

Issue Links

• is part of: HDFS-5939 WebHdfs returns misleading error code and logs nothing if trying to create a file with no DNs in cluster