Package org.apache.flink.runtime.checkpoint.filemerging

Class PhysicalFilePool

java.lang.Object

org.apache.flink.runtime.checkpoint.filemerging.PhysicalFilePool

All Implemented Interfaces:

Closeable, AutoCloseable

Direct Known Subclasses:

BlockingPhysicalFilePool, NonBlockingPhysicalFilePool

public abstract class PhysicalFilePool
extends Object
implements Closeable

A pool for reusing PhysicalFile. This implementation should be thread-safe.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	PhysicalFilePool.Type	Types of supported physical file pool.

Field Summary

Fields

Modifier and Type	Field	Description
protected final Queue<PhysicalFile>	exclusivePhysicalFilePool	Queue maintaining exclusive physical files for reusing.
protected final long	maxFileSize	Max size for a physical file.
protected final PhysicalFile.PhysicalFileCreator	physicalFileCreator	creator to create a physical file.
protected final Map<FileMergingSnapshotManager.SubtaskKey,Queue<PhysicalFile>>	sharedPhysicalFilePoolBySubtask	Map maintaining queues of different subtasks for reusing shared physical files.

Constructor Summary

Constructors

Constructor	Description
PhysicalFilePool(long maxFileSize, PhysicalFile.PhysicalFileCreator physicalFileCreator)

Method Summary

Modifier and Type	Method	Description
void	close()
void	close(FileMergingSnapshotManager.SubtaskKey subtaskKey)	Close files in shared file pool by subtaskKey and close all files in exclusive file pool.
protected abstract Queue<PhysicalFile>	createFileQueue()	Create and return a file queue.
protected Queue<PhysicalFile>	getFileQueue(FileMergingSnapshotManager.SubtaskKey subtaskKey, CheckpointedStateScope scope)	Get or create a file queue for specific subtaskKey and checkpoint scope.
boolean	isEmpty()	Return whether the pool is empty or not.
abstract PhysicalFile	pollFile(FileMergingSnapshotManager.SubtaskKey subtaskKey, CheckpointedStateScope scope)	Poll a physical file from the pool.
abstract boolean	tryPutFile(FileMergingSnapshotManager.SubtaskKey subtaskKey, PhysicalFile physicalFile)	Try to put a physical file into file pool.

Methods inherited from class java.lang.Object

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

Field Details

physicalFileCreator

protected final PhysicalFile.PhysicalFileCreator physicalFileCreator

creator to create a physical file.

maxFileSize

protected final long maxFileSize

Max size for a physical file.

sharedPhysicalFilePoolBySubtask

protected final Map<FileMergingSnapshotManager.SubtaskKey,Queue<PhysicalFile>> sharedPhysicalFilePoolBySubtask

Map maintaining queues of different subtasks for reusing shared physical files.

exclusivePhysicalFilePool

protected final Queue<PhysicalFile> exclusivePhysicalFilePool

Queue maintaining exclusive physical files for reusing.

Constructor Details

PhysicalFilePool

public PhysicalFilePool(long maxFileSize,
 PhysicalFile.PhysicalFileCreator physicalFileCreator)

Method Details

tryPutFile

public abstract boolean tryPutFile(FileMergingSnapshotManager.SubtaskKey subtaskKey,
 PhysicalFile physicalFile)
                            throws IOException

Try to put a physical file into file pool.

Parameters:

subtaskKey - the key of current subtask.

physicalFile - target physical file.

Returns:

true if file is in the pool, false otherwise.

Throws:

IOException

pollFile

@Nonnull
public abstract PhysicalFile pollFile(FileMergingSnapshotManager.SubtaskKey subtaskKey,
 CheckpointedStateScope scope)
                               throws IOException

Poll a physical file from the pool.

Parameters:

subtaskKey - the key of current subtask.

scope - the scope of the checkpoint.

Returns:

a physical file.

Throws:

IOException

createFileQueue

protected abstract Queue<PhysicalFile> createFileQueue()

Create and return a file queue.

Returns:

a created file queue.

getFileQueue

protected Queue<PhysicalFile> getFileQueue(FileMergingSnapshotManager.SubtaskKey subtaskKey,
 CheckpointedStateScope scope)

Get or create a file queue for specific subtaskKey and checkpoint scope.

Parameters:

subtaskKey - the key of current subtask.

scope - the scope of the checkpoint.

Returns:

an existing or created file queue.

isEmpty

public boolean isEmpty()

Return whether the pool is empty or not.

Returns:

whether the pool is empty or not.

close

public void close(FileMergingSnapshotManager.SubtaskKey subtaskKey)
           throws IOException

Close files in shared file pool by subtaskKey and close all files in exclusive file pool.

Parameters:

subtaskKey - the key of current subtask.

Throws:

IOException - if anything goes wrong when closing files.

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Throws:

IOException