org.apache.flink.runtime.blob

Class TransientBlobCache

java.lang.Object

org.apache.flink.runtime.blob.AbstractBlobCache

org.apache.flink.runtime.blob.TransientBlobCache

All Implemented Interfaces:

Closeable, AutoCloseable, TransientBlobService

public class TransientBlobCache
extends AbstractBlobCache
implements TransientBlobService

Provides access to transient BLOB files stored at the BlobServer.

TODO: make this truly transient by returning file streams to a local copy with the remote being removed upon retrieval and the local copy being deleted at the end of the stream.

Field Summary

Fields inherited from class org.apache.flink.runtime.blob.AbstractBlobCache

blobClientConfig, blobView, log, numFetchRetries, readWriteLock, serverAddress, shutdownHook, shutdownRequested, storageDir, tempFileCounter

Constructor Summary

Constructors

Constructor and Description
TransientBlobCache(org.apache.flink.configuration.Configuration blobClientConfig, InetSocketAddress serverAddress) Instantiates a new BLOB cache.

Method Summary

Modifier and Type	Method and Description
protected void	cancelCleanupTask() Cancels any cleanup task that subclasses may be executing.
boolean	deleteFromCache(org.apache.flink.api.common.JobID jobId, TransientBlobKey key) Deletes the file associated with the provided job ID and blob key from the local cache.
boolean	deleteFromCache(TransientBlobKey key) Deletes the (job-unrelated) file associated with the provided blob key from the local cache.
File	getFile(org.apache.flink.api.common.JobID jobId, TransientBlobKey key) Returns the path to a local copy of the file associated with the provided job ID and blob key.
File	getFile(TransientBlobKey key) Returns the path to a local copy of the (job-unrelated) file associated with the provided blob key.
protected File	getFileInternal(org.apache.flink.api.common.JobID jobId, BlobKey blobKey) Returns local copy of the file for the BLOB with the given key.
File	getStorageLocation(org.apache.flink.api.common.JobID jobId, BlobKey key) Returns a file handle to the file associated with the given blob key on the blob server.
TransientBlobKey	putTransient(byte[] value) Uploads the (job-unrelated) data of the given byte array to the BLOB server.
TransientBlobKey	putTransient(InputStream inputStream) Uploads the (job-unrelated) data from the given input stream to the BLOB server.
TransientBlobKey	putTransient(org.apache.flink.api.common.JobID jobId, byte[] value) Uploads the data of the given byte array for the given job to the BLOB server.
TransientBlobKey	putTransient(org.apache.flink.api.common.JobID jobId, InputStream inputStream) Uploads the data from the given input stream for the given job to the BLOB server.

Methods inherited from class org.apache.flink.runtime.blob.AbstractBlobCache

close, getPort, setBlobServerAddress

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.io.Closeable

close

Constructor Detail

TransientBlobCache

public TransientBlobCache(org.apache.flink.configuration.Configuration blobClientConfig,
                          @Nullable
                          InetSocketAddress serverAddress)
                   throws IOException

Instantiates a new BLOB cache.

Parameters:

blobClientConfig - global configuration

serverAddress - address of the BlobServer to use for fetching files from or null if none yet

Throws:

IOException - thrown if the (local or distributed) file storage cannot be created or is not usable

Method Detail

getFile

public File getFile(TransientBlobKey key)
             throws IOException

Description copied from interface: TransientBlobService

Returns the path to a local copy of the (job-unrelated) file associated with the provided blob key.

Specified by:

getFile in interface TransientBlobService

Parameters:

key - blob key associated with the requested file

Returns:

The path to the file.

Throws:

FileNotFoundException - when the path does not exist;

IOException - if any other error occurs when retrieving the file

getFile

public File getFile(org.apache.flink.api.common.JobID jobId,
                    TransientBlobKey key)
             throws IOException

Description copied from interface: TransientBlobService

Returns the path to a local copy of the file associated with the provided job ID and blob key.

Specified by:

getFile in interface TransientBlobService

Parameters:

jobId - ID of the job this blob belongs to

key - blob key associated with the requested file

Returns:

The path to the file.

Throws:

FileNotFoundException - when the path does not exist;

IOException - if any other error occurs when retrieving the file

getFileInternal

protected File getFileInternal(@Nullable
                               org.apache.flink.api.common.JobID jobId,
                               BlobKey blobKey)
                        throws IOException

Description copied from class: AbstractBlobCache

Returns local copy of the file for the BLOB with the given key.

The method will first attempt to serve the BLOB from its local cache. If the BLOB is not in the cache, the method will try to download it from this cache's BLOB server via a distributed BLOB store (if available) or direct end-to-end download.

Overrides:

getFileInternal in class AbstractBlobCache

Parameters:

jobId - ID of the job this blob belongs to (or null if job-unrelated)

blobKey - The key of the desired BLOB.

Returns:

file referring to the local storage location of the BLOB.

Throws:

IOException - Thrown if an I/O error occurs while downloading the BLOBs from the BLOB server.

putTransient

public TransientBlobKey putTransient(byte[] value)
                              throws IOException

Description copied from interface: TransientBlobService

Uploads the (job-unrelated) data of the given byte array to the BLOB server.

Specified by:

putTransient in interface TransientBlobService

Parameters:

value - the buffer to upload

Returns:

the computed BLOB key identifying the BLOB on the server

Throws:

IOException - thrown if an I/O error occurs while uploading the data to the BLOB server

putTransient

public TransientBlobKey putTransient(org.apache.flink.api.common.JobID jobId,
                                     byte[] value)
                              throws IOException

Description copied from interface: TransientBlobService

Uploads the data of the given byte array for the given job to the BLOB server.

Specified by:

putTransient in interface TransientBlobService

Parameters:

jobId - the ID of the job the BLOB belongs to

value - the buffer to upload

Returns:

the computed BLOB key identifying the BLOB on the server

Throws:

IOException - thrown if an I/O error occurs while uploading the data to the BLOB server

putTransient

public TransientBlobKey putTransient(InputStream inputStream)
                              throws IOException

Description copied from interface: TransientBlobService

Uploads the (job-unrelated) data from the given input stream to the BLOB server.

Specified by:

putTransient in interface TransientBlobService

Parameters:

inputStream - the input stream to read the data from

Returns:

the computed BLOB key identifying the BLOB on the server

Throws:

IOException - thrown if an I/O error occurs while reading the data from the input stream or uploading the data to the BLOB server

putTransient

public TransientBlobKey putTransient(org.apache.flink.api.common.JobID jobId,
                                     InputStream inputStream)
                              throws IOException

Description copied from interface: TransientBlobService

Uploads the data from the given input stream for the given job to the BLOB server.

Specified by:

putTransient in interface TransientBlobService

Parameters:

jobId - ID of the job this blob belongs to

inputStream - the input stream to read the data from

Returns:

the computed BLOB key identifying the BLOB on the server

Throws:

IOException - thrown if an I/O error occurs while reading the data from the input stream or uploading the data to the BLOB server

deleteFromCache

public boolean deleteFromCache(TransientBlobKey key)

Description copied from interface: TransientBlobService

Deletes the (job-unrelated) file associated with the provided blob key from the local cache.

Specified by:

deleteFromCache in interface TransientBlobService

Parameters:

key - associated with the file to be deleted

Returns:

true if the given blob is successfully deleted or non-existing; false otherwise

deleteFromCache

public boolean deleteFromCache(org.apache.flink.api.common.JobID jobId,
                               TransientBlobKey key)

Description copied from interface: TransientBlobService

Deletes the file associated with the provided job ID and blob key from the local cache.

Specified by:

deleteFromCache in interface TransientBlobService

Parameters:

jobId - ID of the job this blob belongs to

key - associated with the file to be deleted

Returns:

true if the given blob is successfully deleted or non-existing; false otherwise

getStorageLocation

@VisibleForTesting
public File getStorageLocation(@Nullable
                                                  org.apache.flink.api.common.JobID jobId,
                                                  BlobKey key)
                                           throws IOException

Returns a file handle to the file associated with the given blob key on the blob server.

Parameters:

jobId - ID of the job this blob belongs to (or null if job-unrelated)

key - identifying the file

Returns:

file handle to the file

Throws:

IOException - if creating the directory fails

cancelCleanupTask

protected void cancelCleanupTask()

Description copied from class: AbstractBlobCache

Cancels any cleanup task that subclasses may be executing.

This is called during AbstractBlobCache.close().

Specified by:

cancelCleanupTask in class AbstractBlobCache