org.apache.flink.runtime.state.heap

类 CopyOnWriteStateTableSnapshot<K,N,S>

java.lang.Object

org.apache.flink.runtime.state.heap.CopyOnWriteStateTableSnapshot<K,N,S>

类型参数:

K - type of key

N - type of namespace

S - type of state

所有已实现的接口:

IterableStateSnapshot<K,N,S>, StateSnapshot, StateSnapshot.StateKeyGroupWriter

@Internal
public class CopyOnWriteStateTableSnapshot<K,N,S>
extends Object

This class represents the snapshot of a CopyOnWriteStateTable and has a role in operator state checkpointing. This class is also responsible for writing the state in the process of checkpointing.

嵌套类概要

从接口继承的嵌套类/接口 org.apache.flink.runtime.state.StateSnapshot

StateSnapshot.StateKeyGroupWriter

字段概要

字段

限定符和类型	字段和说明
protected org.apache.flink.api.common.typeutils.TypeSerializer<K>	localKeySerializer A local duplicate of the table's key serializer.
protected org.apache.flink.api.common.typeutils.TypeSerializer<N>	localNamespaceSerializer A local duplicate of the table's namespace serializer.
protected org.apache.flink.api.common.typeutils.TypeSerializer<S>	localStateSerializer A local duplicate of the table's state serializer.
protected StateTable<K,N,S>	owningStateTable The StateTable from which this snapshot was created.
protected StateSnapshotTransformer<S>	stateSnapshotTransformer

方法概要

限定符和类型	方法和说明
Iterator<StateEntry<K,N,S>>	getIterator(int keyGroupId)
StateSnapshot.StateKeyGroupWriter	getKeyGroupWriter() This method returns StateSnapshot.StateKeyGroupWriter and should be called in the asynchronous part of the snapshot.
StateMetaInfoSnapshot	getMetaInfoSnapshot() Returns a snapshot of the state's meta data.
protected StateMapSnapshot<K,N,S,? extends StateMap<K,N,S>>	getStateMapSnapshotForKeyGroup(int keyGroup) Return the state map snapshot for the key group.
void	release() Release the snapshot.
void	writeStateInKeyGroup(org.apache.flink.core.memory.DataOutputView dov, int keyGroupId) Implementation note: we currently chose the same format between NestedMapsStateTable and CopyOnWriteStateTable.

从类继承的方法 java.lang.Object

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

字段详细资料

owningStateTable

protected final StateTable<K,N,S> owningStateTable

The StateTable from which this snapshot was created.

localKeySerializer

@Nonnull
protected final org.apache.flink.api.common.typeutils.TypeSerializer<K> localKeySerializer

A local duplicate of the table's key serializer.

localNamespaceSerializer

@Nonnull
protected final org.apache.flink.api.common.typeutils.TypeSerializer<N> localNamespaceSerializer

A local duplicate of the table's namespace serializer.

localStateSerializer

@Nonnull
protected final org.apache.flink.api.common.typeutils.TypeSerializer<S> localStateSerializer

A local duplicate of the table's state serializer.

stateSnapshotTransformer

@Nullable
protected final StateSnapshotTransformer<S> stateSnapshotTransformer

方法详细资料

getStateMapSnapshotForKeyGroup

protected StateMapSnapshot<K,N,S,? extends StateMap<K,N,S>> getStateMapSnapshotForKeyGroup(int keyGroup)

Return the state map snapshot for the key group. If the snapshot does not exist, return null.

release

public void release()

从接口复制的说明: StateSnapshot

Release the snapshot. All snapshots should be released when they are no longer used because some implementation can only release resources after a release. Produced StateSnapshot.StateKeyGroupWriter should no longer be used after calling this method.

getMetaInfoSnapshot

@Nonnull
public StateMetaInfoSnapshot getMetaInfoSnapshot()

从接口复制的说明: StateSnapshot

Returns a snapshot of the state's meta data.

指定者:

getMetaInfoSnapshot 在接口中 StateSnapshot

getKeyGroupWriter

public StateSnapshot.StateKeyGroupWriter getKeyGroupWriter()

从接口复制的说明: StateSnapshot

This method returns StateSnapshot.StateKeyGroupWriter and should be called in the asynchronous part of the snapshot.

指定者:

getKeyGroupWriter 在接口中 StateSnapshot

getIterator

public Iterator<StateEntry<K,N,S>> getIterator(int keyGroupId)

指定者:

getIterator 在接口中 IterableStateSnapshot<K,N,S>

writeStateInKeyGroup

public void writeStateInKeyGroup(@Nonnull
                                 org.apache.flink.core.memory.DataOutputView dov,
                                 int keyGroupId)
                          throws IOException

Implementation note: we currently chose the same format between NestedMapsStateTable and CopyOnWriteStateTable.

NestedMapsStateTable could naturally support a kind of prefix-compressed format (grouping by namespace, writing the namespace only once per group instead for each mapping). We might implement support for different formats later (tailored towards different state table implementations).

指定者:

writeStateInKeyGroup 在接口中 StateSnapshot.StateKeyGroupWriter

参数:

dov - the output.

keyGroupId - the key-group to write.

抛出:

IOException - on write-related problems.