| Interface | Description | 
|---|---|
| DataReader<T> | A  DataReaderis an interface for reader implementation
 able to read entities from a store. | 
| DataStoreReader<T> | A  DataStoreReaderis an extension ofDataReaderadding methods fromCloseableinterface. | 
| DataStoreWriter<T> | A  DataStoreWriteris an extension ofDataWriteradding methods fromFlushableandCloseableinterfaces. | 
| DataWriter<T> | A  DataWriteris an interface for writer implementation
 able to write entities into a store. | 
| PartitionDataStoreWriter<T,K> | A  DataStorePartitionWriteris an extension ofDataStoreWriteradding functionality to write entities using a partition key. | 
| Class | Description | 
|---|---|
| StoreSystemConstants | Various constants throughout the store package. | 
| Exception | Description | 
|---|---|
| StoreException | An exception that indicates there was an error accessing the the underlying
 HDFS store implementation. |