morningman opened a new issue #704: Balance policy can not address multi 
storage medium cluster
URL: https://github.com/apache/incubator-doris/issues/704
 
 
   **Describe the bug**
   Balance policy on cluster with multi storage medium is more complicated.
   1. When doing balance, a tablet on SSD should be balanced to another SSD 
medium.
   2. Some Backends may have SSD, some may not. So we have to calculate the 
load score in view of storage medium.
   3. When repairing a tablet, we should choose a Backend even if it does not 
have a proper storage medium.

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