org.apache.flink.table.runtime.operators.window.grouping

类 WindowsGrouping

java.lang.Object

org.apache.flink.table.runtime.operators.window.grouping.WindowsGrouping

所有已实现的接口:

Closeable, AutoCloseable

直接已知子类:

HeapWindowsGrouping

public abstract class WindowsGrouping
extends Object
implements Closeable

Assigning windows from the sorted input buffers.

Assign windows and trigger aggregate calculation based on WindowsGrouping. It can avoid data expansion in time sliding window case.

Tumbling window case Each keyed window corresponds to only one element in the WindowsGrouping Buffer (grouping keys, assigned windows, agg buffers).

Sliding window case 1. If the assign pane optimization strategy is used, each keyed window corresponding to WindowsGrouping buffer contains windowsSize/paneSize number of elements (assuming 1s/24h window, there are 86400 elements). 2. Otherwise, the maximum number of elements in WindowsGrouping buffer is the maximum number of inputs in a sliding window.

In most cases, assign pane optimization should be applied, so there should not be much data in WindowsGrouping, and HeapWindowsGrouping is basically okay.

方法概要

限定符和类型	方法和说明
void	addInputToBuffer(org.apache.flink.table.data.binary.BinaryRowData input)
protected abstract void	addIntoBuffer(org.apache.flink.table.data.binary.BinaryRowData input)
void	advanceWatermarkToTriggerAllWindows() Advance the watermark to trigger all the possible windows.
RowIterator<org.apache.flink.table.data.binary.BinaryRowData>	buildTriggerWindowElementsIterator()
TimeWindow	getTriggerWindow()
boolean	hasTriggerWindow() Check if there are windows could be triggered according to the current watermark.
protected abstract RowIterator<org.apache.flink.table.data.binary.BinaryRowData>	newBufferIterator(int startIndex)
protected abstract void	onBufferEvict(int limitIndex)
void	reset() Reset for next group.
protected abstract void	resetBuffer()

从类继承的方法 java.lang.Object

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

从接口继承的方法 java.io.Closeable

close

方法详细资料

reset

public void reset()

Reset for next group.

addInputToBuffer

public void addInputToBuffer(org.apache.flink.table.data.binary.BinaryRowData input)
                      throws IOException

抛出:

IOException

advanceWatermarkToTriggerAllWindows

public void advanceWatermarkToTriggerAllWindows()

Advance the watermark to trigger all the possible windows. It is designed to be idempotent.

hasTriggerWindow

public boolean hasTriggerWindow()

Check if there are windows could be triggered according to the current watermark.

返回:

true when there are windows to be triggered. It is designed to be idempotent.

buildTriggerWindowElementsIterator

public RowIterator<org.apache.flink.table.data.binary.BinaryRowData> buildTriggerWindowElementsIterator()

返回:

the iterator of the next triggerable window's elements.

getTriggerWindow

public TimeWindow getTriggerWindow()

返回:

the last triggered window.

resetBuffer

protected abstract void resetBuffer()

addIntoBuffer

protected abstract void addIntoBuffer(org.apache.flink.table.data.binary.BinaryRowData input)
                               throws IOException

抛出:

IOException

onBufferEvict

protected abstract void onBufferEvict(int limitIndex)

newBufferIterator

protected abstract RowIterator<org.apache.flink.table.data.binary.BinaryRowData> newBufferIterator(int startIndex)