Package org.apache.flink.runtime.filecache

Class FileCache

java.lang.Object

org.apache.flink.runtime.filecache.FileCache

public class FileCache
extends Object

The FileCache is used to access registered cache files when a task is deployed.

Files and zipped directories are retrieved from the PermanentBlobService. The life-cycle of these files is managed by the blob-service.

Retrieved directories will be expanded in "<system-tmp-dir>/tmp_<jobID>/" and deleted when the task is unregistered after a 5 second delay, unless a new task requests the file in the meantime.

Constructor Summary

Constructors

Constructor	Description
FileCache(String[] tempDirectories, PermanentBlobService blobService)

Method Summary

Modifier and Type	Method	Description
Future<org.apache.flink.core.fs.Path>	createTmpFile(String name, org.apache.flink.api.common.cache.DistributedCache.DistributedCacheEntry entry, org.apache.flink.api.common.JobID jobID, ExecutionAttemptID executionId)	If the file doesn't exists locally, retrieve the file from the blob-service.
void	releaseJob(org.apache.flink.api.common.JobID jobId, ExecutionAttemptID executionId)
void	shutdown()	Shuts down the file cache by cancelling all.

Methods inherited from class java.lang.Object

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

Constructor Details

FileCache

public FileCache(String[] tempDirectories,
 PermanentBlobService blobService)
          throws IOException

Throws:

IOException

Method Details

shutdown

public void shutdown()

Shuts down the file cache by cancelling all.

createTmpFile

public Future<org.apache.flink.core.fs.Path> createTmpFile(String name,
 org.apache.flink.api.common.cache.DistributedCache.DistributedCacheEntry entry,
 org.apache.flink.api.common.JobID jobID,
 ExecutionAttemptID executionId)
                                                    throws Exception

If the file doesn't exists locally, retrieve the file from the blob-service.

Parameters:

entry - The cache entry descriptor (path, executable flag)

jobID - The ID of the job for which the file is copied.

Returns:

The handle to the task that copies the file.

Throws:

Exception

releaseJob

public void releaseJob(org.apache.flink.api.common.JobID jobId,
 ExecutionAttemptID executionId)