[jira] [Created] (HBASE-21152) Add parameter validations for commands in HBase shell

["Toshihiro Suzuki (JIRA)" <ji...@apache.org>]

Toshihiro Suzuki created HBASE-21152:
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             Summary: Add parameter validations for commands in HBase shell
                 Key: HBASE-21152
                 URL: https://issues.apache.org/jira/browse/HBASE-21152
             Project: HBase
          Issue Type: Improvement
          Components: shell
            Reporter: Toshihiro Suzuki
            Assignee: Toshihiro Suzuki


One of our customers got confused with "balance_switch" command in HBase shell.

They mistakenly ran "balance_swich status" command instead of "balancer_enabled" command to see if the balancer is enabled. However, like the following, it didn't cause any errors and it looks like the command was successful. 
{code}
hbase> balance_switch status
1 active master, 0 backup masters, 1 servers, 0 dead, 2.0000 average load
Took 0.0055 seconds
Previous balancer state : true
Took 0.0041 seconds
=> "true"
{code}

To make matters worse, the "balance_swich status" command will make the balancer disabled.

Of course, the command was wrong but I think that's a little bit confusing. So I think we need to add parameter validations for commands in HBase shell. I'll check if we need to add validations for any other commands in this Jira.



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