Hi,
Stratos auto scaling policy uses three parameters to be scaled. One is
Request in flight count of the load balancer, that is number is of requests
to be served. In another way it is equal to no of requests received minus
no of requests served. If you are using a load balancer this property is
useful. However if you did not specify this property, autoscaling will not
consider this property. However this is not a critical effect to
the function of Stratos since normal functionality works fine without this.
On Fri, Jul 17, 2015 at 9:46 AM, Udara Liyanage <ud...@wso2.com> wrote:
> Hi Feng,
>
> Welcome to Stratos community.
> Could you please share the autoscaling policy you deployed. It
> seems requestsInFlight value of the auto scaling policy is zero or not
> specified.
>
> On Fri, Jul 17, 2015 at 1:12 AM, Feng Zhou (fezhou2) <fezh...@cisco.com>
> wrote:
>
>> Hello all,
>>
>> My name is Feng, I work for Cisco. Nice to be a new member of
>> the stratos dev mailing list!
>>
>> Want to get some suggestion on a repeated error message we are
>> seeing in stratos logs, the log look like this:
>>
>> TID: [0] [STRATOS] [2015-06-25 09:48:08,424] ERROR
>> {org.apache.stratos.autoscaler.rule.RuleTasksDelegator} - Request in
>> flight threshold is Zero
>> TID: [0] [STRATOS] [2015-06-25 09:49:08,424] ERROR
>> {org.apache.stratos.autoscaler.rule.RuleTasksDelegator} - Request in
>> flight threshold is Zero
>> TID: [0] [STRATOS] [2015-06-25 09:50:08,424] ERROR
>> {org.apache.stratos.autoscaler.rule.RuleTasksDelegator} - Request in
>> flight threshold is Zero
>>
>>
>> It comes up quite often, and from what we observe it seems not do
>> much harm… so can someone explain what is this error and is it really
>> an error?
>>
>> Also I did a little bit of digging inside the code, the
>> following code piece looks might be doing the logging:
>>
>>
>> components/org.apache.stratos.autoscaler/src/main/java/org/apache/stratos/autoscaler/rule/RuleTasksDelegator.java
>>
>>
>>
>>
>>
>> publicint getNumberOfInstancesRequiredBasedOnRif(float
>> rifPredictedValue, float rifThreshold) {
>>
>>
>>
>> if (rifThreshold != 0) {
>>
>>
>>
>> float requiredNumberOfInstances = rifPredictedValue /
>> rifThreshold;
>>
>> return (int) Math.ceil(requiredNumberOfInstances);
>>
>> } else {
>>
>> log.error("Request in flight threshold is Zero");
>>
>> return0;
>>
>> }
>>
>>
>>
>> }
>>
>>
>>
>>
>>
>> Question is, is it normal for rifThreshold to be 0? Should we fix
>> this condition, or if it is not so critical, would it be proper to lower
>> this error to like warning?
>>
>>
>>
>> Thank!
>>
>>
>>
>> -Feng Zhou
>>
>
>
>
> --
>
> Udara Liyanage
> Software Engineer
> WSO2, Inc.: http://wso2.com
> lean. enterprise. middleware
>
> web: http://udaraliyanage.wordpress.com
> phone: +94 71 443 6897
>
--
Udara Liyanage
Software Engineer
WSO2, Inc.: http://wso2.com
lean. enterprise. middleware
web: http://udaraliyanage.wordpress.com
phone: +94 71 443 6897
