org.apache.flink.runtime.state.memory

Class PersistentMetadataCheckpointStorageLocation

java.lang.Object

org.apache.flink.runtime.state.memory.MemCheckpointStreamFactory

org.apache.flink.runtime.state.memory.PersistentMetadataCheckpointStorageLocation

All Implemented Interfaces:

CheckpointStorageLocation, CheckpointStreamFactory

public class PersistentMetadataCheckpointStorageLocation
extends MemCheckpointStreamFactory
implements CheckpointStorageLocation

A checkpoint storage location for the MemoryStateBackend when it durably persists the metadata in a file system.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.flink.runtime.state.memory.MemCheckpointStreamFactory

MemCheckpointStreamFactory.MemoryCheckpointOutputStream

Constructor Summary

Constructors

Constructor and Description
PersistentMetadataCheckpointStorageLocation(FileSystem fileSystem, Path checkpointDir, int maxStateSize) Creates a checkpoint storage persists metadata to a file system and stores state in line in state handles with the metadata.

Method Summary

Modifier and Type	Method and Description
CheckpointMetadataOutputStream	createMetadataOutputStream() Creates the output stream to persist the checkpoint metadata to.
void	disposeOnFailure() Disposes the checkpoint location in case the checkpoint has failed.
CheckpointStorageLocationReference	getLocationReference() Gets a reference to the storage location.

Methods inherited from class org.apache.flink.runtime.state.memory.MemCheckpointStreamFactory

canFastDuplicate, createCheckpointStateOutputStream, duplicate, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.flink.runtime.state.CheckpointStreamFactory

canFastDuplicate, couldReuseStateHandle, createCheckpointStateOutputStream, duplicate, reusePreviousStateHandle

Constructor Detail

PersistentMetadataCheckpointStorageLocation

public PersistentMetadataCheckpointStorageLocation(FileSystem fileSystem,
                                                   Path checkpointDir,
                                                   int maxStateSize)

Creates a checkpoint storage persists metadata to a file system and stores state in line in state handles with the metadata.

Parameters:

fileSystem - The file system to which the metadata will be written.

checkpointDir - The directory where the checkpoint metadata will be written.

Method Detail

createMetadataOutputStream

public CheckpointMetadataOutputStream createMetadataOutputStream()
                                                          throws IOException

Description copied from interface: CheckpointStorageLocation

Creates the output stream to persist the checkpoint metadata to.

Specified by:

createMetadataOutputStream in interface CheckpointStorageLocation

Returns:

The output stream to persist the checkpoint metadata to.

Throws:

IOException - Thrown, if the stream cannot be opened due to an I/O error.

disposeOnFailure

public void disposeOnFailure()
                      throws IOException

Description copied from interface: CheckpointStorageLocation

Disposes the checkpoint location in case the checkpoint has failed. This method disposes all the data at that location, not just the data written by the particular node or process that calls this method.

Specified by:

disposeOnFailure in interface CheckpointStorageLocation

Throws:

IOException

getLocationReference

public CheckpointStorageLocationReference getLocationReference()

Description copied from interface: CheckpointStorageLocation

Gets a reference to the storage location. This reference is sent to the target storage location via checkpoint RPC messages and checkpoint barriers, in a format avoiding backend-specific classes.

If there is no custom location information that needs to be communicated, this method can simply return CheckpointStorageLocationReference.getDefault().

Specified by:

getLocationReference in interface CheckpointStorageLocation