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https://issues.apache.org/jira/browse/HDFS-3482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14082405#comment-14082405
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Hudson commented on HDFS-3482:
------------------------------
SUCCESS: Integrated in Hadoop-Hdfs-trunk #1824 (See
[https://builds.apache.org/job/Hadoop-Hdfs-trunk/1824/])
HDFS-3482. Update CHANGES.txt. (arp:
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1615019)
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
> 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
> Assignee: madhukara phatak
> Priority: Minor
> Labels: newbie
> Fix For: 3.0.0, 2.6.0
>
> Attachments: HDFS-3482-1.patch, HDFS-3482-2.patch, HDFS-3482-3.patch,
> HDFS-3482-4.patch, HDFS-3482-4.patch, HDFS-3482.patch
>
>
> 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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