Work on HDFS-14894 started by Leon Gao.
> Add balancer parameter to balance top used nodes
> ------------------------------------------------
>                 Key: HDFS-14894
>                 URL: https://issues.apache.org/jira/browse/HDFS-14894
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: balancer & mover
>            Reporter: Leon Gao
>            Assignee: Leon Gao
>            Priority: Major
> We sometimes see a few of our datanodes reach very high usage (due to various 
> reasons) and we need to reduce their usage in an urgent situation.
> We see two ways to achieve it currently,
> -Calculate and reset balancing threshold.
> -Pick nodes manually according to usage stats and put them in a file and use 
> `-resource` flag.
> However, both of them are not very intuitive or too much manual work in an 
> urgent close-to-outage situation. Add a small feature to automatically pick 
> top used hosts will be a straightforward option, for example 
> `-sourceThreshold 95` to only target datanodes with >95% usage. 

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