spark MemoryAllocator 源码
spark MemoryAllocator 代码
文件路径：/common/unsafe/src/main/java/org/apache/spark/unsafe/memory/MemoryAllocator.java
/*
* 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.spark.unsafe.memory;
public interface MemoryAllocator {
/**
* Whether to fill newly allocated and deallocated memory with 0xa5 and 0x5a bytes respectively.
* This helps catch misuse of uninitialized or freed memory, but imposes some overhead.
*/
boolean MEMORY_DEBUG_FILL_ENABLED = Boolean.parseBoolean(
System.getProperty("spark.memory.debugFill", "false"));
// Same as jemalloc's debug fill values.
byte MEMORY_DEBUG_FILL_CLEAN_VALUE = (byte)0xa5;
byte MEMORY_DEBUG_FILL_FREED_VALUE = (byte)0x5a;
/**
* Allocates a contiguous block of memory. Note that the allocated memory is not guaranteed
* to be zeroed out (call `fill(0)` on the result if this is necessary).
*/
MemoryBlock allocate(long size) throws OutOfMemoryError;
void free(MemoryBlock memory);
MemoryAllocator UNSAFE = new UnsafeMemoryAllocator();
MemoryAllocator HEAP = new HeapMemoryAllocator();
}
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