hadoop RamManager 源码
haddop RamManager 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/RamManager.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.hadoop.mapred;
import java.io.InputStream;
/**
* <code>RamManager</code> manages a memory pool of a configured limit.
*/
interface RamManager {
/**
* Reserve memory for data coming through the given input-stream.
*
* @param requestedSize size of memory requested
* @param in input stream
* @throws InterruptedException
* @return <code>true</code> if memory was allocated immediately,
* else <code>false</code>
*/
boolean reserve(int requestedSize, InputStream in)
throws InterruptedException;
/**
* Return memory to the pool.
*
* @param requestedSize size of memory returned to the pool
*/
void unreserve(int requestedSize);
}
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