org.apache.cassandra.net

Class RateBasedBackPressure

java.lang.Object

org.apache.cassandra.net.RateBasedBackPressure

All Implemented Interfaces:

BackPressureStrategy<org.apache.cassandra.net.RateBasedBackPressureState>

public class RateBasedBackPressure
extends java.lang.Object
implements BackPressureStrategy<org.apache.cassandra.net.RateBasedBackPressureState>

Back-pressure algorithm based on rate limiting according to the ratio between incoming and outgoing rates, computed over a sliding time window with size equal to write RPC timeout.

Field Summary

Fields

Modifier and Type	Field and Description
protected int	factor
protected org.apache.cassandra.net.RateBasedBackPressure.Flow	flow
protected double	highRatio
protected TimeSource	timeSource
protected long	windowSize

Constructor Summary

Constructors

Constructor and Description
RateBasedBackPressure(java.util.Map<java.lang.String,java.lang.Object> args)
RateBasedBackPressure(java.util.Map<java.lang.String,java.lang.Object> args, TimeSource timeSource, long windowSize)

Method Summary

Modifier and Type	Method and Description
void	apply(java.util.Set<org.apache.cassandra.net.RateBasedBackPressureState> states, long timeout, java.util.concurrent.TimeUnit unit) Applies the back-pressure algorithm, based and acting on the given BackPressureStates, and up to the given timeout.
org.apache.cassandra.net.RateBasedBackPressureState	newState(java.net.InetAddress host) Creates a new BackPressureState initialized as needed by the specific implementation.
static ParameterizedClass	withDefaultParams()

Methods inherited from class java.lang.Object

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

Field Detail

timeSource

protected final TimeSource timeSource

highRatio

protected final double highRatio

factor

protected final int factor

flow

protected final org.apache.cassandra.net.RateBasedBackPressure.Flow flow

windowSize

protected final long windowSize

Constructor Detail

RateBasedBackPressure

public RateBasedBackPressure(java.util.Map<java.lang.String,java.lang.Object> args)

RateBasedBackPressure

public RateBasedBackPressure(java.util.Map<java.lang.String,java.lang.Object> args,
                             TimeSource timeSource,
                             long windowSize)

Method Detail

withDefaultParams

public static ParameterizedClass withDefaultParams()

apply

public void apply(java.util.Set<org.apache.cassandra.net.RateBasedBackPressureState> states,
                  long timeout,
                  java.util.concurrent.TimeUnit unit)

Description copied from interface: BackPressureStrategy

Applies the back-pressure algorithm, based and acting on the given BackPressureStates, and up to the given timeout.

Specified by:

apply in interface BackPressureStrategy<org.apache.cassandra.net.RateBasedBackPressureState>

newState

public org.apache.cassandra.net.RateBasedBackPressureState newState(java.net.InetAddress host)

Description copied from interface: BackPressureStrategy

Creates a new BackPressureState initialized as needed by the specific implementation.

Specified by:

newState in interface BackPressureStrategy<org.apache.cassandra.net.RateBasedBackPressureState>