jiangshouzhuang opened a new pull request #1627: fix backends disk error 
statistics issue
URL: https://github.com/apache/incubator-doris/pull/1627
 
 
   #1608
   
   The main problem solved is an error in disk statistics when Doris's 
storage_root_path is set to a storage limit, rather than using the full disk 
capacity.
   
   The modification points are as follows:
   1. In masterservice.thrift, a new parameter is added to the TDisk structure, 
and the ambiguous parameters are adjusted at the same time
   2. Get the size of the total disk capacity in the BE module
   3. Fix the error information of UsedPct and MaxDiskUsedPct statistics in the 
current version
   
   Test screenshots are as follows:
   * http://FE_HOST:IP/system?path=//backends
   
![image](https://user-images.githubusercontent.com/19518068/62831536-a77ff880-bc53-11e9-9afb-537d0a163307.png)
       - DataUsedCapacity: Size already used by Doris's databases
       - AvailCapacity: Disk remaining size
       - TotalCapacity: The total amount of the storage_root_path parameter 
configured
       - TotalUsedPct: DataUsedCapacity/TotalCapacity
       - DiskTotalCapacity: The total size of the disk where storage_root_path 
resides
   * http://FE_HOST:IP/system?path=//backends/11001 
   
![image](https://user-images.githubusercontent.com/19518068/62831539-ac44ac80-bc53-11e9-9efb-c5a73da85013.png)
       - DataUsedCapacity: Size already used by Doris's databases in current 
RootPath
       - OtherUsedCapacity: Other than Doris, the size is taken up
       - AvailCapacity: Disk remaining size
       - TotalCapacity: The size of the storage_root_path parameter configured
       - TotalUsedPct: DataUsedCapacity/TotalCapacity
       - DiskTotalCapacity: The size of the disk where storage_root_path resides
   

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