| Class and Description | 
|---|
| HdfsServerConstants.NamenodeRole Defines the NameNode role. | 
| HdfsServerConstants.NodeType Type of the node | 
| HdfsServerConstants.ReplicaState Block replica states, which it can go through while being constructed. | 
| Class and Description | 
|---|
| HdfsServerConstants.BlockUCState States, which a block can go through while it is under construction. | 
| Class and Description | 
|---|
| HdfsServerConstants.BlockUCState States, which a block can go through while it is under construction. | 
| HdfsServerConstants.NamenodeRole Defines the NameNode role. | 
| HdfsServerConstants.NodeType Type of the node | 
| HdfsServerConstants.ReplicaState Block replica states, which it can go through while being constructed. | 
| HdfsServerConstants.RollingUpgradeStartupOption Startup options for rolling upgrade. | 
| HdfsServerConstants.StartupOption Startup options | 
| Storage.StorageState | 
| Class and Description | 
|---|
| HdfsServerConstants.ReplicaState Block replica states, which it can go through while being constructed. | 
| Class and Description | 
|---|
| HdfsServerConstants.NamenodeRole Defines the NameNode role. | 
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