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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.flink.runtime.io.network.partition;
import java.io.File;
import java.io.IOException;
/**
* The type of the BoundedBlockingSubpartition. Also doubles as the factory.
*/
public enum BoundedBlockingSubpartitionType {
/**
* A BoundedBlockingSubpartition type that simply stores the partition data in a file.
* Data is eagerly spilled (written to disk) and readers directly read from the file.
*/
FILE {
@Override
public BoundedBlockingSubpartition create(int index, ResultPartition parent, File tempFile, int readBufferSize) throws IOException {
return BoundedBlockingSubpartition.createWithFileChannel(index, parent, tempFile, readBufferSize);
}
},
/**
* A BoundedBlockingSubpartition type that stores the partition data in memory mapped file.
* Data is written to and read from the mapped memory region.
* Disk spilling happens lazily, when the OS swaps out the pages from the memory mapped file.
*/
MMAP {
@Override
public BoundedBlockingSubpartition create(int index, ResultPartition parent, File tempFile, int readBufferSize) throws IOException {
return BoundedBlockingSubpartition.createWithMemoryMappedFile(index, parent, tempFile);
}
},
/**
* Creates a BoundedBlockingSubpartition that stores the partition data in a file and
* memory maps that file for reading.
* Data is eagerly spilled (written to disk) and then mapped into memory. The main
* difference to the {@link BoundedBlockingSubpartitionType#MMAP} variant
* is that no I/O is necessary when pages from the memory mapped file are evicted.
*/
FILE_MMAP {
@Override
public BoundedBlockingSubpartition create(int index, ResultPartition parent, File tempFile, int readBufferSize) throws IOException {
return BoundedBlockingSubpartition.createWithFileAndMemoryMappedReader(index, parent, tempFile);
}
},
/**
* Selects the BoundedBlockingSubpartition type based on the current memory architecture. If 64-bit,
* the type of {@link BoundedBlockingSubpartitionType#FILE_MMAP} is recommended. Otherwise, the type
* of {@link BoundedBlockingSubpartitionType#FILE} is by default.
*/
AUTO {
@Override
public BoundedBlockingSubpartition create(int index, ResultPartition parent, File tempFile, int readBufferSize) throws IOException {
return ResultPartitionFactory.getBoundedBlockingType().create(index, parent, tempFile, readBufferSize);
}
};
// ------------------------------------------------------------------------
/**
* Creates BoundedBlockingSubpartition of this type.
*/
public abstract BoundedBlockingSubpartition create(int index, ResultPartition parent, File tempFile, int readBufferSize) throws IOException;
}
