[I] Assign region throw exception when some region is deployed on affinity node and some on non-affinity node (drill)

[via GitHub]

shfshihuafeng opened a new issue, #2886:
URL: https://github.com/apache/drill/issues/2886

   Before submitting a bug report, please verify that you are using the most 
current version of Drill.  
   
   **Describe the bug**
   Assign region throw exception when some region is deployed on affinity node 
and some on non-affinity node
   
   **To Reproduce**
   Steps to reproduce the behavior:
   NavigableMap<HRegionInfo,ServerName> regionsToScan = Maps.newTreeMap();
   regionsToScan.put(new HRegionInfo(TABLE_NAME, splits[0], splits[1]), 
SERVER_A);
   regionsToScan.put(new HRegionInfo(TABLE_NAME, splits[1], splits[2]), 
SERVER_A);
   regionsToScan.put(new HRegionInfo(TABLE_NAME, splits[2], splits[3]), 
SERVER_B);
   regionsToScan.put(new HRegionInfo(TABLE_NAME, splits[3], splits[4]), 
SERVER_B);
   regionsToScan.put(new HRegionInfo(TABLE_NAME, splits[6], splits[7]), 
SERVER_D);
   regionsToScan.put(new HRegionInfo(TABLE_NAME, splits[7], splits[8]), 
SERVER_D);
   regionsToScan.put(new HRegionInfo(TABLE_NAME, splits[8], splits[9]), 
SERVER_D);
   regionsToScan.put(new HRegionInfo(TABLE_NAME, splits[9], splits[10]), 
SERVER_D);
   final List<DrillbitEndpoint> endpoints = Lists.newArrayList();
   
endpoints.add(DrillbitEndpoint.newBuilder().setAddress(HOST_A).setControlPort(1234).build());
   
endpoints.add(DrillbitEndpoint.newBuilder().setAddress(HOST_B).setControlPort(1234).build());
   
endpoints.add(DrillbitEndpoint.newBuilder().setAddress(HOST_C).setControlPort(1234).build());
   
   HBaseGroupScan scan = new HBaseGroupScan();
   scan.setRegionsToScan(regionsToScan);
   scan.setHBaseScanSpec(new HBaseScanSpec(TABLE_NAME_STR, splits[0], 
splits[0], null));
   scan.applyAssignments(endpoints);
   
   **Expected behavior**
   ```
    A has 3 regions
   
    B has 2 regions
   
    C has 3 regions
   ```
   
   **Error detail, log output or screenshots**
   ```
   Caused by: java.lang.NullPointerException: null
           at 
org.apache.drill.exec.store.hbase.HBaseGroupScan.applyAssignments(HBaseGroupScan.java:283)
   ```
   
   **Drill version**
   The version of Drill you encountered the issue in.
   
   **Additional context**
   Add any other context about the problem here.
   


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