alluxio.client.keyvalue

Interface KeyValueStoreReader

All Superinterfaces:

AutoCloseable, Closeable, KeyValueIterable

@PublicApi
public interface KeyValueStoreReader
extends Closeable, KeyValueIterable

Interface for readers which accesses key-value stores in Alluxio.

Method Summary

Modifier and Type	Method and Description
byte[]	get(byte[] key) Gets the value associated with key, returns null if not found.
ByteBuffer	get(ByteBuffer key) Gets the value associated with key, returns null if not found.
int	size()

Methods inherited from interface java.io.Closeable

close

Methods inherited from interface alluxio.client.keyvalue.KeyValueIterable

iterator

Method Detail

get

byte[] get(byte[] key)
    throws IOException,
           AlluxioException

Gets the value associated with key, returns null if not found. When getting large values (e.g., larger than 10KB), get(ByteBuffer) might be more efficient by taking advantage from zero-copy.

Parameters:

key - key to get, cannot be null

Returns:

value associated with the given key, or null if not found

Throws:

IOException

AlluxioException

get

ByteBuffer get(ByteBuffer key)
        throws IOException,
               AlluxioException

Gets the value associated with key, returns null if not found.

Parameters:

key - key to get, cannot be null

Returns:

value associated with the given key, or null if not found

Throws:

IOException

AlluxioException

size

int size()
  throws IOException,
         AlluxioException

Returns:

the number of key-value pairs in the store

Throws:

IOException

AlluxioException