NealSun96 opened a new issue #795: Incorrect behavior in 
ZkRoutingDataReader.getRoutingData
URL: https://github.com/apache/helix/issues/795
 
 
   In the current version of `ZkRoutingDataReader`, its `getRoutingData` method 
has the following lines:
   ```
   if (shardingKeys != null) {
       routingData.put(realmAddress, shardingKeys);
   }
   ```
   This is an incorrect behavior because if a realm does not have the sharding 
keys list field, the realm will not be added to the returned routing data. We 
have decided that as long as the realm exists on ZooKeeper as a node, it should 
be included in the routing data regardless of whether it has associated 
sharding keys. The fix is to assign an empty list in the above condition. 

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