org.apache.flink.streaming.runtime.io

类 CachedBufferStorage

java.lang.Object

org.apache.flink.streaming.runtime.io.CachedBufferStorage

所有已实现的接口:

AutoCloseable, BufferStorage

@Internal
public class CachedBufferStorage
extends Object
implements BufferStorage

The CachedBufferStorage takes the buffers and events from a data stream and adds them to a memory queue. After a number of elements have been cached, the CachedBufferStorage can "roll over": It presents the cached elements as a readable sequence, and creates a new memory queue.

This CachedBufferStorage can be used in credit-based flow control for better barrier alignment in exactly-once mode.

构造器概要

构造器

构造器和说明
CachedBufferStorage(int pageSize) Create a new CachedBufferStorage with unlimited storage.
CachedBufferStorage(int pageSize, long maxBufferedBytes, String taskName) Creates a new CachedBufferStorage, caching the buffers or events in memory queue.

方法概要

限定符和类型	方法和说明
void	add(org.apache.flink.runtime.io.network.partition.consumer.BufferOrEvent boe) Adds a buffer or event to the BufferStorage.
void	close() Cleans up all the resources in the current sequence.
long	getMaxBufferedBytes()
long	getPendingBytes()
long	getRolledBytes()
boolean	isEmpty()
boolean	isFull()
Optional<org.apache.flink.runtime.io.network.partition.consumer.BufferOrEvent>	pollNext()
void	rollOver() Start returning next sequence of stored BufferOrEvents.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

CachedBufferStorage

public CachedBufferStorage(int pageSize)

Create a new CachedBufferStorage with unlimited storage.

参数:

pageSize - The page size used to estimate the cached size.

CachedBufferStorage

public CachedBufferStorage(int pageSize,
                           long maxBufferedBytes,
                           String taskName)

Creates a new CachedBufferStorage, caching the buffers or events in memory queue.

参数:

pageSize - The page size used to estimate the cached size.

方法详细资料

add

public void add(org.apache.flink.runtime.io.network.partition.consumer.BufferOrEvent boe)

从接口复制的说明: BufferStorage

Adds a buffer or event to the BufferStorage.

指定者:

add 在接口中 BufferStorage

参数:

boe - The buffer or event to be added into the blocker.

close

public void close()

从接口复制的说明: BufferStorage

Cleans up all the resources in the current sequence.

指定者:

close 在接口中 AutoCloseable

指定者:

close 在接口中 BufferStorage

getPendingBytes

public long getPendingBytes()

指定者:

getPendingBytes 在接口中 BufferStorage

返回:

the number of pending bytes blocked in the current sequence - bytes that are have not been yet rolled, but are already blocked.

isFull

public boolean isFull()

指定者:

isFull 在接口中 BufferStorage

返回:

true if size limit was exceeded.

rollOver

public void rollOver()

从接口复制的说明: BufferStorage

Start returning next sequence of stored BufferOrEvents.

指定者:

rollOver 在接口中 BufferStorage

getRolledBytes

public long getRolledBytes()

指定者:

getRolledBytes 在接口中 BufferStorage

返回:

the number of already rolled bytes in in blocked sequences.

isEmpty

public boolean isEmpty()

指定者:

isEmpty 在接口中 BufferStorage

返回:

true if this BufferStorage doesn't store and data.

pollNext

public Optional<org.apache.flink.runtime.io.network.partition.consumer.BufferOrEvent> pollNext()

指定者:

pollNext 在接口中 BufferStorage

getMaxBufferedBytes

public long getMaxBufferedBytes()

指定者:

getMaxBufferedBytes 在接口中 BufferStorage