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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