Package org.apache.flink.state.forst.fs.filemapping

Class FileMappingManager

java.lang.Object

org.apache.flink.state.forst.fs.filemapping.FileMappingManager

public class FileMappingManager
extends Object

A manager to manage file mapping of forst file system, including misc file mapping (remote file -> local file) and linked mapping (remote file -> remote file). Note, the key/value of mapping table must be a file path, directories are maintained by file system itself, directories wouldn't be the key/value of mapping table.

Constructor Summary

Constructors

Constructor	Description
FileMappingManager(org.apache.flink.core.fs.FileSystem fileSystem, String remoteBase, String localBase)

Method Summary

Modifier and Type	Method	Description
MappingEntry	createNewFile(org.apache.flink.core.fs.Path filePath, boolean overwrite, FileBasedCache cache)	Create a new file in the mapping table.
boolean	deleteFileOrDirectory(org.apache.flink.core.fs.Path file, boolean recursive)	Delete a file or directory from mapping table and file system, the directory deletion may be deferred.
void	giveUpOwnership(org.apache.flink.core.fs.Path path, org.apache.flink.runtime.state.StreamStateHandle stateHandle)
int	link(String src, String dst)	Add a mapping 'dst -> src' to the mapping table.
List<String>	listByPrefix(String path)
MappingEntry	mappingEntry(String path)
MappingEntry	registerReusedRestoredFile(String key, org.apache.flink.runtime.state.StreamStateHandle stateHandle, org.apache.flink.core.fs.Path dbFilePath, FileBasedCache cache)	Register a file restored from checkpoints to the mapping table.
boolean	renameFile(String src, String dst)	1.

Methods inherited from class java.lang.Object

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

Constructor Details

FileMappingManager

public FileMappingManager(org.apache.flink.core.fs.FileSystem fileSystem,
 String remoteBase,
 String localBase)

Method Details

createNewFile

public MappingEntry createNewFile(org.apache.flink.core.fs.Path filePath,
 boolean overwrite,
 FileBasedCache cache)

Create a new file in the mapping table.

registerReusedRestoredFile

public MappingEntry registerReusedRestoredFile(String key,
 org.apache.flink.runtime.state.StreamStateHandle stateHandle,
 org.apache.flink.core.fs.Path dbFilePath,
 FileBasedCache cache)

Register a file restored from checkpoints to the mapping table.

link

public int link(String src,
 String dst)

Add a mapping 'dst -> src' to the mapping table.

listByPrefix

public List<String> listByPrefix(String path)

renameFile

public boolean renameFile(String src,
 String dst)
                   throws IOException

1. If src can match any key, we only `mark rename`, no physical file would be renamed. 2. If src is a directory, all files under src will be renamed, including linked files and local files, the directory also would be renamed in file system physically.

Parameters:

src - the source path

dst - the destination path

Returns:

always return true except for IOException

Throws:

IOException

deleteFileOrDirectory

public boolean deleteFileOrDirectory(org.apache.flink.core.fs.Path file,
 boolean recursive)
                              throws IOException

Delete a file or directory from mapping table and file system, the directory deletion may be deferred.

Parameters:

file - to be deleted

recursive - whether to delete recursively

Returns:

true if the file or directory is deleted successfully, false otherwise.

Throws:

IOException - if an error occurs during deletion

mappingEntry

@VisibleForTesting
@Nullable
public MappingEntry mappingEntry(String path)

giveUpOwnership

public void giveUpOwnership(org.apache.flink.core.fs.Path path,
 org.apache.flink.runtime.state.StreamStateHandle stateHandle)