org.apache.flink.contrib.streaming.state

Class RocksDBReducingState<K,N,V>

java.lang.Object

org.apache.flink.contrib.streaming.state.AbstractRocksDBState<K,N,V,org.apache.flink.api.common.state.ReducingState<V>>

org.apache.flink.contrib.streaming.state.RocksDBReducingState<K,N,V>

Type Parameters:

K - The type of the key.

N - The type of the namespace.

V - The type of value that the state state stores.

All Implemented Interfaces:

org.apache.flink.api.common.state.AppendingState<V,V>, org.apache.flink.api.common.state.MergingState<V,V>, org.apache.flink.api.common.state.ReducingState<V>, org.apache.flink.api.common.state.State, org.apache.flink.runtime.state.internal.InternalAppendingState<K,N,V,V,V>, org.apache.flink.runtime.state.internal.InternalKvState<K,N,V>, org.apache.flink.runtime.state.internal.InternalMergingState<K,N,V,V,V>, org.apache.flink.runtime.state.internal.InternalReducingState<K,N,V>

public class RocksDBReducingState<K,N,V>
extends AbstractRocksDBState<K,N,V,org.apache.flink.api.common.state.ReducingState<V>>
implements org.apache.flink.runtime.state.internal.InternalReducingState<K,N,V>

ReducingState implementation that stores state in RocksDB.

Field Summary

Fields inherited from class org.apache.flink.contrib.streaming.state.AbstractRocksDBState

backend, columnFamily, defaultValue, keySerializationDataOutputView, keySerializationStream, writeOptions

Constructor Summary

Constructors

Constructor and Description
RocksDBReducingState(org.rocksdb.ColumnFamilyHandle columnFamily, org.apache.flink.api.common.typeutils.TypeSerializer<N> namespaceSerializer, org.apache.flink.api.common.typeutils.TypeSerializer<V> valueSerializer, V defaultValue, org.apache.flink.api.common.functions.ReduceFunction<V> reduceFunction, RocksDBKeyedStateBackend<K> backend) Creates a new RocksDBReducingState.

Method Summary

Modifier and Type	Method and Description
void	add(V value)
V	get()
org.apache.flink.api.common.typeutils.TypeSerializer<K>	getKeySerializer()
org.apache.flink.api.common.typeutils.TypeSerializer<N>	getNamespaceSerializer()
org.apache.flink.api.common.typeutils.TypeSerializer<V>	getValueSerializer()
void	mergeNamespaces(N target, Collection<N> sources)

Methods inherited from class org.apache.flink.contrib.streaming.state.AbstractRocksDBState

clear, getDefaultValue, getSerializedValue, setCurrentNamespace, writeCurrentKeyWithGroupAndNamespace, writeKeyWithGroupAndNamespace, writeKeyWithGroupAndNamespace

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.flink.runtime.state.internal.InternalKvState

getSerializedValue, setCurrentNamespace

Methods inherited from interface org.apache.flink.api.common.state.State

clear

Constructor Detail

RocksDBReducingState

public RocksDBReducingState(org.rocksdb.ColumnFamilyHandle columnFamily,
                            org.apache.flink.api.common.typeutils.TypeSerializer<N> namespaceSerializer,
                            org.apache.flink.api.common.typeutils.TypeSerializer<V> valueSerializer,
                            V defaultValue,
                            org.apache.flink.api.common.functions.ReduceFunction<V> reduceFunction,
                            RocksDBKeyedStateBackend<K> backend)

Creates a new RocksDBReducingState.

Parameters:

columnFamily - The RocksDB column family that this state is associated to.

namespaceSerializer - The serializer for the namespace.

valueSerializer - The serializer for the state.

defaultValue - The default value for the state.

reduceFunction - The reduce function used for reducing state.

backend - The backend for which this state is bind to.

Method Detail

getKeySerializer

public org.apache.flink.api.common.typeutils.TypeSerializer<K> getKeySerializer()

Specified by:

getKeySerializer in interface org.apache.flink.runtime.state.internal.InternalKvState<K,N,V>

getNamespaceSerializer

public org.apache.flink.api.common.typeutils.TypeSerializer<N> getNamespaceSerializer()

Specified by:

getNamespaceSerializer in interface org.apache.flink.runtime.state.internal.InternalKvState<K,N,V>

getValueSerializer

public org.apache.flink.api.common.typeutils.TypeSerializer<V> getValueSerializer()

Specified by:

getValueSerializer in interface org.apache.flink.runtime.state.internal.InternalKvState<K,N,V>

get

public V get()

Specified by:

get in interface org.apache.flink.api.common.state.AppendingState<V,V>

add

public void add(V value)
         throws IOException

Specified by:

add in interface org.apache.flink.api.common.state.AppendingState<V,V>

Throws:

IOException

mergeNamespaces

public void mergeNamespaces(N target,
                            Collection<N> sources)
                     throws Exception

Specified by:

mergeNamespaces in interface org.apache.flink.runtime.state.internal.InternalMergingState<K,N,V,V,V>

Throws:

Exception