Package org.apache.cassandra.service.reads

Class PercentileSpeculativeRetryPolicy

java.lang.Object

org.apache.cassandra.service.reads.PercentileSpeculativeRetryPolicy

All Implemented Interfaces:

SpeculativeRetryPolicy

public class PercentileSpeculativeRetryPolicy
extends Object
implements SpeculativeRetryPolicy

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.cassandra.service.reads.SpeculativeRetryPolicy

SpeculativeRetryPolicy.Kind

Field Summary

Fields

Modifier and Type	Field	Description
static final PercentileSpeculativeRetryPolicy	NINETY_NINE_P

Constructor Summary

Constructors

Constructor	Description
PercentileSpeculativeRetryPolicy(double percentile)

Method Summary

Modifier and Type	Method	Description
long	calculateThreshold(com.codahale.metrics.Snapshot snapshot, long existingValue)
long	calculateThreshold(SnapshottingTimer latency, long existingValue)	Calculate the delay in microseconds after which speculation takes place
boolean	equals(Object obj)
int	hashCode()
SpeculativeRetryPolicy.Kind	kind()
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

NINETY_NINE_P

public static final PercentileSpeculativeRetryPolicy NINETY_NINE_P

Constructor Details

PercentileSpeculativeRetryPolicy

public PercentileSpeculativeRetryPolicy(double percentile)

Method Details

calculateThreshold

public long calculateThreshold(SnapshottingTimer latency,
 long existingValue)

Description copied from interface: SpeculativeRetryPolicy

Calculate the delay in microseconds after which speculation takes place

Specified by:

calculateThreshold in interface SpeculativeRetryPolicy

Parameters:

latency - snapshot of coordinator latencies (in microseconds)

existingValue - existing speculation threshold (in microseconds)

Returns:

speculation delay (in microseconds).

calculateThreshold

public long calculateThreshold(com.codahale.metrics.Snapshot snapshot,
 long existingValue)

kind

public SpeculativeRetryPolicy.Kind kind()

Specified by:

kind in interface SpeculativeRetryPolicy

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object