hadoop PrefetchingStatistics 源码
haddop PrefetchingStatistics 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/impl/prefetch/PrefetchingStatistics.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.fs.impl.prefetch;
import java.time.Duration;
import org.apache.hadoop.fs.statistics.DurationTracker;
import org.apache.hadoop.fs.statistics.IOStatisticsSource;
public interface PrefetchingStatistics extends IOStatisticsSource {
/**
* A prefetch operation has started.
* @return duration tracker
*/
DurationTracker prefetchOperationStarted();
/**
* A block has been saved to the file cache.
*/
void blockAddedToFileCache();
/**
* A block has been removed from the file cache.
*/
void blockRemovedFromFileCache();
/**
* A prefetch operation has completed.
*/
void prefetchOperationCompleted();
/**
* An executor has been acquired, either for prefetching or caching.
* @param timeInQueue time taken to acquire an executor.
*/
void executorAcquired(Duration timeInQueue);
/**
* A new buffer has been added to the buffer pool.
* @param size size of the new buffer
*/
void memoryAllocated(int size);
/**
* Previously allocated memory has been freed.
* @param size size of memory freed.
*/
void memoryFreed(int size);
}
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