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From "Stephen Chu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3482) hdfs balancer throws ArrayIndexOutOfBoundsException if option is specified without arguments
Date Thu, 31 May 2012 16:49:23 GMT
Stephen Chu created HDFS-3482:
---------------------------------

             Summary: hdfs balancer throws ArrayIndexOutOfBoundsException if option is specified
without arguments
                 Key: HDFS-3482
                 URL: https://issues.apache.org/jira/browse/HDFS-3482
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: balancer
    Affects Versions: 2.0.0-alpha
            Reporter: Stephen Chu
            Priority: Minor


When running the hdfs balancer with an option but no argument, we run into an ArrayIndexOutOfBoundsException.
It's preferable to print the usage.

{noformat}
bash-3.2$ hdfs balancer -threshold
Usage: java Balancer
    [-policy <policy>]	the balancing policy: datanode or blockpool
    [-threshold <threshold>]	Percentage of disk capacity
Balancing took 261.0 milliseconds
12/05/31 09:38:46 ERROR balancer.Balancer: Exiting balancer due an exception
java.lang.ArrayIndexOutOfBoundsException: 1
	at org.apache.hadoop.hdfs.server.balancer.Balancer$Cli.parse(Balancer.java:1505)
	at org.apache.hadoop.hdfs.server.balancer.Balancer$Cli.run(Balancer.java:1482)
	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
	at org.apache.hadoop.hdfs.server.balancer.Balancer.main(Balancer.java:1555)
bash-3.2$ hdfs balancer -policy
Usage: java Balancer
    [-policy <policy>]	the balancing policy: datanode or blockpool
    [-threshold <threshold>]	Percentage of disk capacity
Balancing took 261.0 milliseconds
12/05/31 09:39:03 ERROR balancer.Balancer: Exiting balancer due an exception
java.lang.ArrayIndexOutOfBoundsException: 1
	at org.apache.hadoop.hdfs.server.balancer.Balancer$Cli.parse(Balancer.java:1520)
	at org.apache.hadoop.hdfs.server.balancer.Balancer$Cli.run(Balancer.java:1482)
	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
	at org.apache.hadoop.hdfs.server.balancer.Balancer.main(Balancer.java:1555)
{noformat}

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