yinzhijian opened a new pull request #8553:
URL: https://github.com/apache/incubator-doris/pull/8553


   # Proposed changes
   
   Issue Number: close #8550
   
   ## Problem Summary:
   
   Current situation of doris is that the cluster is balanced, but the disks of 
a backend may be unbalanced.
   for example, backend A have two disks: disk1 and disk2, disk1's usage is 
98%, but disk2's usage is only 40%. disk1 is unable to take more data, 
therefore only one disk of backend A can take new data, the avaiable write 
throughput of backend A is only half of its ability, and we can not resolve 
this through load or partition rebalace now.
   
   So we introduce disk rebalancer, disk rebalancer is different from other 
rebalancer(load or partition) which take care of cluster-wide data balancing. 
it takes care about backend-wide data balancing.
   
   [For more details see 
#8550](https://github.com/apache/incubator-doris/issues/8550) 
   
   ## Checklist(Required)
   
   1. Does it affect the original behavior: (Yes)
   2. Has unit tests been added: (No)
   3. Has document been added or modified: (Yes)
   4. Does it need to update dependencies: (No)
   5. Are there any changes that cannot be rolled back: (No)
   
   ## Further comments
   
   If this is a relatively large or complex change, kick off the discussion at 
[[email protected]](mailto:[email protected]) by explaining why you 
chose the solution you did and what alternatives you considered, etc...
   


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