org.apache.flink.runtime.state

Class SavepointSnapshotStrategy<K>

java.lang.Object

org.apache.flink.runtime.state.SavepointSnapshotStrategy<K>

All Implemented Interfaces:

SnapshotStrategy<KeyedStateHandle,FullSnapshotResources<K>>

public class SavepointSnapshotStrategy<K>
extends Object
implements SnapshotStrategy<KeyedStateHandle,FullSnapshotResources<K>>

A SnapshotStrategy that produces unified savepoints.

See FullSnapshotRestoreOperation for an explanation of the file layout of a savepoint.

See Also:

FullSnapshotRestoreOperation

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.flink.runtime.state.SnapshotStrategy

SnapshotStrategy.SnapshotResultSupplier<S extends StateObject>

Constructor Summary

Constructors

Constructor and Description
SavepointSnapshotStrategy(FullSnapshotResources<K> savepointResources) Creates a SavepointSnapshotStrategy that writes a savepoint from the given FullSnapshotResources.

Method Summary

Modifier and Type	Method and Description
SnapshotStrategy.SnapshotResultSupplier<KeyedStateHandle>	asyncSnapshot(FullSnapshotResources<K> savepointResources, long checkpointId, long timestamp, CheckpointStreamFactory streamFactory, CheckpointOptions checkpointOptions) Operation that writes a snapshot into a stream that is provided by the given CheckpointStreamFactory and returns a @SupplierWithException that gives a state handle to the snapshot.
FullSnapshotResources<K>	syncPrepareResources(long checkpointId) Performs the synchronous part of the snapshot.

Methods inherited from class java.lang.Object

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

Constructor Detail

SavepointSnapshotStrategy

public SavepointSnapshotStrategy(FullSnapshotResources<K> savepointResources)

Creates a SavepointSnapshotStrategy that writes a savepoint from the given FullSnapshotResources.

Method Detail

syncPrepareResources

public FullSnapshotResources<K> syncPrepareResources(long checkpointId)
                                              throws Exception

Description copied from interface: SnapshotStrategy

Performs the synchronous part of the snapshot. It returns resources which can be later on used in the asynchronous part.

Specified by:

syncPrepareResources in interface SnapshotStrategy<KeyedStateHandle,FullSnapshotResources<K>>

Parameters:

checkpointId - The ID of the checkpoint.

Returns:

Resources needed to finish the snapshot.

Throws:

Exception

asyncSnapshot

public SnapshotStrategy.SnapshotResultSupplier<KeyedStateHandle> asyncSnapshot(FullSnapshotResources<K> savepointResources,
                                                                               long checkpointId,
                                                                               long timestamp,
                                                                               @Nonnull
                                                                               CheckpointStreamFactory streamFactory,
                                                                               @Nonnull
                                                                               CheckpointOptions checkpointOptions)

Description copied from interface: SnapshotStrategy

Operation that writes a snapshot into a stream that is provided by the given CheckpointStreamFactory and returns a @SupplierWithException that gives a state handle to the snapshot.

Specified by:

asyncSnapshot in interface SnapshotStrategy<KeyedStateHandle,FullSnapshotResources<K>>

checkpointId - The ID of the checkpoint.

timestamp - The timestamp of the checkpoint.

streamFactory - The factory that we can use for writing our state to streams.

checkpointOptions - Options for how to perform this checkpoint.

Returns:

A supplier that will yield a StateObject.