[jira] [Created] (HDFS-10567) Improve plan command help message

["Lei (Eddy) Xu (JIRA)" <ji...@apache.org>]

Lei (Eddy) Xu created HDFS-10567:
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             Summary: Improve plan command help message
                 Key: HDFS-10567
                 URL: https://issues.apache.org/jira/browse/HDFS-10567
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Lei (Eddy) Xu


{code}
    --bandwidth <arg>             Maximum disk bandwidth to be consumed by
                                  diskBalancer. e.g. 10
    --maxerror <arg>              Describes how many errors can be
                                  tolerated while copying between a pair
                                  of disks.
    --out <arg>                   File to write output to, if not
                                  specified defaults will be used.
    --plan <arg>                  creates a plan for datanode.
    --thresholdPercentage <arg>   Percentage skew that wetolerate before
                                  diskbalancer starts working e.g. 10
    --v                           Print out the summary of the plan on
                                  console
{code}

We should 
* Put the unit into {{--bandwidth}}, or its help message. Is it an integer or float / double number? Not clear in CLI message.
* Give more details about {{--plan}}. It is not clear what the {{<arg>}} is for.
* {{--thresholdPercentage}},  has typo {{wetolerate}} in the error message. Also it needs to indicated that it is the difference between space utilization between two disks / volumes.  Is it an integer or float / double number?

Thanks.





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