org.apache.flink.runtime.state

Interface CheckpointStateToolset

All Known Implementing Classes:

FsCheckpointStateToolset, NotDuplicatingCheckpointStateToolset

@Internal
public interface CheckpointStateToolset

A toolset of operations that can be performed on a location embedded within the class. Created in CheckpointStorageWorkerView.

Method Summary

Modifier and Type	Method and Description
boolean	canFastDuplicate(StreamStateHandle stateHandle) Tells if we can duplicate the given StreamStateHandle.
List<StreamStateHandle>	duplicate(List<StreamStateHandle> stateHandle) Duplicates StreamStateHandles into the path embedded inside of the class.

Method Detail

canFastDuplicate

boolean canFastDuplicate(StreamStateHandle stateHandle)
                  throws IOException

Tells if we can duplicate the given StreamStateHandle.

This should be a rather cheap operation, preferably not involving any remote accesses.

Parameters:

stateHandle - The handle to duplicate

Returns:

true, if we can perform the duplication

Throws:

IOException

duplicate

List<StreamStateHandle> duplicate(List<StreamStateHandle> stateHandle)
                           throws IOException

Duplicates StreamStateHandles into the path embedded inside of the class.

You should first check if you can duplicate with canFastDuplicate(StreamStateHandle).

Parameters:

stateHandle - The handles to duplicate

Returns:

The duplicated handles

Throws:

IOException