| Package | Description | 
|---|---|
| org.apache.hadoop.hdfs.server.federation.resolver | The resolver package contains indepedent data resolvers used in HDFS
 federation. | 
| org.apache.hadoop.hdfs.server.federation.store | The federation state store tracks persistent values that are shared between
 multiple routers. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | MembershipNamenodeResolverImplements a cached lookup of the most recently active namenode for a
 particular nameservice. | 
| class  | MountTableResolverMount table to map between global paths and remote locations. | 
| class  | MultipleDestinationMountTableResolverMount table resolver that supports multiple locations for each mount entry. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | CachedRecordStore<R extends BaseRecord>Record store that takes care of caching the records in memory. | 
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