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/*
* 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.druid.indexing.common.task.batch.parallel;
import org.apache.druid.indexing.worker.shuffle.IntermediaryDataManager;
import java.io.File;
import java.io.IOException;
/**
* An interface for intermediate data shuffle during the parallel indexing.
* The only available implementation for production code is {@link HttpShuffleClient} and
* this interface is more for easier testing.
*
* @see IntermediaryDataManager
* @see PartialSegmentMergeTask
*/
public interface ShuffleClient
{
/**
* Fetch the segment file into the local storage for the given supervisorTaskId and the location.
* If the segment file should be fetched from a remote site, the returned file will be created under the given
* partitionDir. Otherwise, the returned file can be located in any path.
*/
<T, P extends PartitionLocation<T>> File fetchSegmentFile(File partitionDir, String supervisorTaskId, P location)
throws IOException;
}