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https://issues.apache.org/jira/browse/HDFS-14894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16949836#comment-16949836
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Leon Gao edited comment on HDFS-14894 at 10/12/19 1:46 AM:
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Hi [~kihwal]  [~ayushtkn] [~weichiu] , Could you take a look (PR ready) and let 
me know any thoughts? Thanks!


was (Author: leong):
Hi [~kihwal] , Could you take a look at the PR and let me know any thoughts? 
Thanks!

> 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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