| Class | Description | 
|---|---|
| ClientZKSyncer | Tracks the target znode(s) on server ZK cluster and synchronize them to client ZK cluster if
 changed
 
 The target znode(s) is given through  ClientZKSyncer.getPathsToWatch()method | 
| ClientZKSyncer.ZKData | Used to store the newest data which we want to sync to client zk. | 
| MasterAddressSyncer | Tracks the active master address on server ZK cluster and synchronize them to client ZK cluster
 if changed | 
| MetaLocationSyncer | Tracks the meta region locations on server ZK cluster and synchronize them to client ZK cluster
 if changed | 
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