org.apache.tez.dag.app.dag.speculation.legacy.forecast

Class SimpleExponentialSmoothing

java.lang.Object

org.apache.tez.dag.app.dag.speculation.legacy.forecast.SimpleExponentialSmoothing

public class SimpleExponentialSmoothing
extends Object

Implementation of the static model for Simple exponential smoothing.

Method Summary

Modifier and Type	Method and Description
static SimpleExponentialSmoothing	createForecast(long timeConstant, int skipCnt, long stagnatedWindow, long timeStamp) Create forecast simple exponential smoothing.
double	getForecast() Gets forecast.
AtomicReference<org.apache.tez.dag.app.dag.speculation.legacy.forecast.SimpleExponentialSmoothing.ForecastRecord>	getForecastRefEntry() Gets forecast ref entry.
double	getRawData() Gets raw data.
double	getSSE() Gets sse.
long	getStartTime() Gets start time.
long	getTimeStamp() Gets time stamp.
void	incorporateReading(long timeStamp, double currRawData) Incorporate reading.
boolean	isDataStagnated(long timeStamp) checks if the task is hanging up.
boolean	isDefaultForecast(double value) Is default forecast boolean.
boolean	isErrorWithinBound(double bound) Is error within bound boolean.
String	toString()

Methods inherited from class java.lang.Object

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

Method Detail

createForecast

public static SimpleExponentialSmoothing createForecast(long timeConstant,
                                                        int skipCnt,
                                                        long stagnatedWindow,
                                                        long timeStamp)

Create forecast simple exponential smoothing.

Parameters:

timeConstant - the time constant

skipCnt - the skip cnt

stagnatedWindow - the stagnated window

timeStamp - the time stamp

Returns:

the simple exponential smoothing

isDataStagnated

public boolean isDataStagnated(long timeStamp)

checks if the task is hanging up.

Parameters:

timeStamp - current time of the scan.

Returns:

true if we have number of samples > kMinimumReads and the record timestamp has expired.

incorporateReading

public void incorporateReading(long timeStamp,
                               double currRawData)

Incorporate reading.

Parameters:

timeStamp - the time stamp

currRawData - the curr raw data

getForecast

public double getForecast()

Gets forecast.

Returns:

the forecast

isDefaultForecast

public boolean isDefaultForecast(double value)

Is default forecast boolean.

Parameters:

value - the value

Returns:

the boolean

getSSE

public double getSSE()

Gets sse.

Returns:

the sse

isErrorWithinBound

public boolean isErrorWithinBound(double bound)

Is error within bound boolean.

Parameters:

bound - the bound

Returns:

the boolean

getRawData

public double getRawData()

Gets raw data.

Returns:

the raw data

getTimeStamp

public long getTimeStamp()

Gets time stamp.

Returns:

the time stamp

getStartTime

public long getStartTime()

Gets start time.

Returns:

the start time

getForecastRefEntry

public AtomicReference<org.apache.tez.dag.app.dag.speculation.legacy.forecast.SimpleExponentialSmoothing.ForecastRecord> getForecastRefEntry()

Gets forecast ref entry.

Returns:

the forecast ref entry

toString

public String toString()

Overrides:

toString in class Object