org.apache.flink.runtime.filecache

类 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.

构造器概要

构造器

构造器和说明
FileCache(String[] tempDirectories, PermanentBlobService blobService)

方法概要

限定符和类型	方法和说明
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.

从类继承的方法 java.lang.Object

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

构造器详细资料

FileCache

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

抛出:

IOException

方法详细资料

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.

参数:

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

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

返回:

The handle to the task that copies the file.

抛出:

Exception

releaseJob

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