| Package | Description | 
|---|---|
| org.apache.hadoop.hdfs.server.federation.metrics | Report metrics for Router-based Federation. | 
| org.apache.hadoop.hdfs.server.federation.store.driver | The state store uses modular data storage classes derived from
 StateStoreDriver to handle querying, updating and deleting data records. | 
| org.apache.hadoop.hdfs.server.federation.store.driver.impl | Implementations of state store data providers/drivers. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | NullStateStoreMetricsImplementation of the State Store metrics which does not do anything. | 
| Modifier and Type | Method and Description | 
|---|---|
| static StateStoreMetrics | StateStoreMetrics. create(org.apache.hadoop.conf.Configuration conf) | 
| Modifier and Type | Method and Description | 
|---|---|
| StateStoreMetrics | StateStoreDriver. getMetrics()Get the metrics for the State Store. | 
| Modifier and Type | Method and Description | 
|---|---|
| boolean | StateStoreDriver. init(org.apache.hadoop.conf.Configuration config,
    String id,
    Collection<Class<? extends BaseRecord>> records,
    StateStoreMetrics stateStoreMetrics)Initialize the state store connection. | 
| Modifier and Type | Method and Description | 
|---|---|
| boolean | StateStoreSerializableImpl. init(org.apache.hadoop.conf.Configuration config,
    String id,
    Collection<Class<? extends BaseRecord>> records,
    StateStoreMetrics metrics) | 
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