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https://issues.apache.org/jira/browse/STRATOS-939?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nirmal Fernando updated STRATOS-939:
------------------------------------
Description:
How we calculate gradient of two events?
Say the events are; e1(t1,v1) and e2(t2,v2)
tx - time in milliseconds when xth event occurred
vx - value (memory, cpu etc.) that xth event carries
time gap = t(2-1) = t2 -t1 milliseconds
time gap in seconds = t(2-1) = (t2 - t1)/1000 seconds
Hence,
Gradient = (v2 - v1) / t(2-1) = ( (v2 - v1) * 1000 ) / (t2 - t1)
I've enabled debug logs for CEP extension;
log4j.logger.org.apache.stratos.cep.extension=DEBUG
Please find the following 3 logs extracted from the debug logs;
===================================================================
TID: [0] [STRATOS] [2014-11-05 19:47:27,073] DEBUG
{org.apache.stratos.cep.extension.SecondDerivativeFinderWindowProcessor} -
Gradient: -0.1996007984031936 Last val: 9.0 First val: 12.0 Time Gap: 15030 t1:
1415213202095 t2: 1415213217125 hash: 155426542
TID: [0] [STRATOS] [2014-11-05 19:47:27,073] DEBUG
{org.apache.stratos.cep.extension.SecondDerivativeFinderWindowProcessor} -
Gradient: -999.9999999999998 Last val: 7.000000000000001 First val: 12.0 Time
Gap: 5 t1: 1415213232152 t2: 1415213232157 hash: 155426542
TID: [0] [STRATOS] [2014-11-05 19:47:27,074] DEBUG
{org.apache.stratos.cep.extension.SecondDerivativeFinderWindowProcessor} -
Gradient: -44.34884666437174 Last val: -999.9999999999998 First val:
-0.1996007984031936 Time Gap: 22544 t1: 1415213209610 t2: 1415213232154 hash:
155426542
===================================================================
So, as you can see the reason behind a large value is when the time gap between
two subjected events is less than 1 second. This could happen since events are
coming from different asynchronous agents and also when there are less number
of events.
FIX
====
So, the fix I propose is a very simple one and it will not compromise anything
AFAIS.
Fix is to calculate time gap as follows;
__ t2 - t1
| yes?
time gap = t(2-1) = t2 -t1 > 1000 ---
|__ 1000
I have tested this and works fine.
was:
How we calculate gradient of two events?
Say the events are; e1(t1,v1) and e2(t2,v2)
tx - time in milliseconds when xth event occurred
vx - value (memory, cpu etc.) that xth event carries
time gap = t(2-1) = t2 -t1 milliseconds
time gap in seconds = t(2-1) = (t2 - t1)/1000 seconds
Hence,
Gradient = (v2 - v1) / t(2-1) = ( (v2 - v1) * 1000 ) / (t2 - t1)
I've enabled debug logs for CEP extension;
log4j.logger.org.apache.stratos.cep.extension=DEBUG
Please find the following 3 logs extracted from the debug logs;
===================================================================
TID: [0] [STRATOS] [2014-11-05 19:47:27,073] DEBUG
{org.apache.stratos.cep.extension.SecondDerivativeFinderWindowProcessor} -
Gradient: -0.1996007984031936 Last val: 9.0 First val: 12.0 Time Gap: 15030 t1:
1415213202095 t2: 1415213217125 hash: 155426542
TID: [0] [STRATOS] [2014-11-05 19:47:27,073] DEBUG
{org.apache.stratos.cep.extension.SecondDerivativeFinderWindowProcessor} -
Gradient: -999.9999999999998 Last val: 7.000000000000001 First val: 12.0 Time
Gap: 5 t1: 1415213232152 t2: 1415213232157 hash: 155426542
TID: [0] [STRATOS] [2014-11-05 19:47:27,074] DEBUG
{org.apache.stratos.cep.extension.SecondDerivativeFinderWindowProcessor} -
Gradient: -44.34884666437174 Last val: -999.9999999999998 First val:
-0.1996007984031936 Time Gap: 22544 t1: 1415213209610 t2: 1415213232154 hash:
155426542
===================================================================
So, as you can see the reason behind a large value is when the time gap between
two subjected events is less than 1 second. This could happen since events are
coming from different asynchronous agents and also when there are less number
of events.
FIX
====
So, the fix I propose is a very simple one and it will not compromise anything
AFAIS.
Fix is to calculate time gap as follows;
____ t2 - t1
| yes?
time gap = t(2-1) = t2 -t1 > 1000 ---
|____ 1000
I have tested this and works fine.
> CEP sends very large values for gradient and second derivative of load average
> ------------------------------------------------------------------------------
>
> Key: STRATOS-939
> URL: https://issues.apache.org/jira/browse/STRATOS-939
> Project: Stratos
> Issue Type: Bug
> Components: CEP
> Affects Versions: 4.1.0 M3
> Reporter: Nirmal Fernando
> Assignee: Nirmal Fernando
> Priority: Critical
> Fix For: 4.1.0 M4
>
>
> How we calculate gradient of two events?
> Say the events are; e1(t1,v1) and e2(t2,v2)
> tx - time in milliseconds when xth event occurred
> vx - value (memory, cpu etc.) that xth event carries
> time gap = t(2-1) = t2 -t1 milliseconds
> time gap in seconds = t(2-1) = (t2 - t1)/1000 seconds
> Hence,
> Gradient = (v2 - v1) / t(2-1) = ( (v2 - v1) * 1000 ) / (t2 - t1)
> I've enabled debug logs for CEP extension;
> log4j.logger.org.apache.stratos.cep.extension=DEBUG
> Please find the following 3 logs extracted from the debug logs;
> ===================================================================
> TID: [0] [STRATOS] [2014-11-05 19:47:27,073] DEBUG
> {org.apache.stratos.cep.extension.SecondDerivativeFinderWindowProcessor} -
> Gradient: -0.1996007984031936 Last val: 9.0 First val: 12.0 Time Gap: 15030
> t1: 1415213202095 t2: 1415213217125 hash: 155426542
> TID: [0] [STRATOS] [2014-11-05 19:47:27,073] DEBUG
> {org.apache.stratos.cep.extension.SecondDerivativeFinderWindowProcessor} -
> Gradient: -999.9999999999998 Last val: 7.000000000000001 First val: 12.0 Time
> Gap: 5 t1: 1415213232152 t2: 1415213232157 hash: 155426542
> TID: [0] [STRATOS] [2014-11-05 19:47:27,074] DEBUG
> {org.apache.stratos.cep.extension.SecondDerivativeFinderWindowProcessor} -
> Gradient: -44.34884666437174 Last val: -999.9999999999998 First val:
> -0.1996007984031936 Time Gap: 22544 t1: 1415213209610 t2: 1415213232154 hash:
> 155426542
> ===================================================================
> So, as you can see the reason behind a large value is when the time gap
> between two subjected events is less than 1 second. This could happen since
> events are coming from different asynchronous agents and also when there are
> less number of events.
> FIX
> ====
> So, the fix I propose is a very simple one and it will not compromise
> anything AFAIS.
> Fix is to calculate time gap as follows;
> __ t2 - t1
> | yes?
> time gap = t(2-1) = t2 -t1 > 1000 ---
> |__ 1000
> I have tested this and works fine.
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