Package org.apache.hadoop.fs.impl.prefetch

Interface PrefetchingStatistics

All Superinterfaces:

IOStatisticsSource

All Known Implementing Classes:

EmptyPrefetchingStatistics

public interface PrefetchingStatistics
extends IOStatisticsSource

Method Summary

Modifier and Type	Method	Description
void	blockAddedToFileCache()	A block has been saved to the file cache.
void	blockEvictedFromFileCache()	A block has been evicted from the file cache.
void	blockRemovedFromFileCache()	A block has been removed from the file cache.
void	executorAcquired(java.time.Duration timeInQueue)	An executor has been acquired, either for prefetching or caching.
void	memoryAllocated(int size)	A new buffer has been added to the buffer pool.
void	memoryFreed(int size)	Previously allocated memory has been freed.
void	prefetchOperationCompleted()	A prefetch operation has completed.
DurationTracker	prefetchOperationStarted()	A prefetch operation has started.

Methods inherited from interface org.apache.hadoop.fs.statistics.IOStatisticsSource

getIOStatistics

Method Detail

prefetchOperationStarted

DurationTracker prefetchOperationStarted()

A prefetch operation has started.

Returns:

duration tracker

blockAddedToFileCache

void blockAddedToFileCache()

A block has been saved to the file cache.

blockRemovedFromFileCache

void blockRemovedFromFileCache()

A block has been removed from the file cache.

blockEvictedFromFileCache

void blockEvictedFromFileCache()

A block has been evicted from the file cache.

prefetchOperationCompleted

void prefetchOperationCompleted()

A prefetch operation has completed.

executorAcquired

void executorAcquired(java.time.Duration timeInQueue)

An executor has been acquired, either for prefetching or caching.

Parameters:

timeInQueue - time taken to acquire an executor.

memoryAllocated

void memoryAllocated(int size)

A new buffer has been added to the buffer pool.

Parameters:

size - size of the new buffer

memoryFreed

void memoryFreed(int size)

Previously allocated memory has been freed.

Parameters:

size - size of memory freed.