alluxio.client.keyvalue

Interface KeyValuePartitionReader

All Superinterfaces:

AutoCloseable, Closeable, KeyValueIterable

All Known Implementing Classes:

ByteBufferKeyValuePartitionReader

public interface KeyValuePartitionReader
extends Closeable, KeyValueIterable

Interface for a reader which accesses an Alluxio key-value partition.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	KeyValuePartitionReader.Factory Factory for KeyValuePartitionReader.

Method Summary

Modifier and Type	Method and Description
byte[]	get(byte[] key) Gets the value associated with the given key in the key-value partition, returning null if the key is not found.
ByteBuffer	get(ByteBuffer key) Gets the value associated with the given key in the key-value partition, returning null if the key is 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 the given key in the key-value partition, returning null if the key is not found.

Parameters:

key - key to get, cannot be null

Returns:

bytes of the value if found, null otherwise

Throws:

IOException

AlluxioException

get

ByteBuffer get(ByteBuffer key)
        throws IOException,
               AlluxioException

Gets the value associated with the given key in the key-value partition, returning null if the key is not found. Both key and value are in ByteBuffer to make zero-copy possible for better performance.

Parameters:

key - key to get, cannot be null

Returns:

bytes of the value if found, null otherwise

Throws:

IOException

AlluxioException

size

int size()
  throws IOException,
         AlluxioException

Returns:

the number of key-value pairs in the partition

Throws:

IOException

AlluxioException