org.apache.flink.runtime.blob.PermanentBlobService Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.flink.runtime.blob;
import org.apache.flink.api.common.JobID;
import java.io.Closeable;
import java.io.File;
import java.io.IOException;
/**
* A service to retrieve permanent binary large objects (BLOBs).
*
* These may include per-job BLOBs that are covered by high-availability (HA) mode, e.g. a job's
* JAR files or (parts of) an off-loaded {@link org.apache.flink.runtime.deployment.TaskDeploymentDescriptor}
* or files in the {@link org.apache.flink.api.common.cache.DistributedCache}.
*/
public interface PermanentBlobService extends Closeable {
/**
* Returns the path to a local copy of the file associated with the provided job ID and blob
* key.
*
* @param jobId
* ID of the job this blob belongs to
* @param key
* BLOB key associated with the requested file
*
* @return The path to the file.
*
* @throws java.io.FileNotFoundException
* if the BLOB does not exist;
* @throws IOException
* if any other error occurs when retrieving the file
*/
File getFile(JobID jobId, PermanentBlobKey key) throws IOException;
}