Re: Question about Faban/workload driver + multiple Glassfish servers

Tue, 24 Nov 2009 10:14:54 -0800

Harold - you may also want to try nginx. mod_proxy performance is supposed to be pretty bad. The rails folk typically use nginx for proxying. 

Shanti

Akara Sucharitakul wrote:
Unfortunately not. If there is any accounting information available through mod_proxy, this would be most helpful. We have to determine at this level whether requests are distributed evenly. If not, why? And can we do anything about it, short of fixing mod_proxy. All this information is missing. Thanks. 

-Akara

Shanti Subramanyam wrote:
I assume mod_proxy will do a round-robin scheduling of the initial request. Even if subsequent requests in the same session are tied to the same appserver, I would think that you should see an even distribution as each session (on avg) should be placing the same load. 
Let's see if Akara has better insights.

Shanti

Harold Lim wrote:

Hi Akara,
Currently, what I have is an apache front-end using mod_proxy as a load balancer for multiple glassfish servers. In Faban, I just enter the address of the apache server. It works fine but I have to turn on sticky session. Without sticky session, it's not allowing the pages to log-in (i think because it's returning with different glassfish server each time).
The problem I have now is that when I run my benchmark run, the load is not balanced. It is skewed towards one of the glassfish server (i.e, 1 glassfish server has 70+% utilization, the other 2 only has 40+%).
I was looking at the UIDriver of Olio and saw that the httpconnection instance is being reused. It only gets "a new fresh state" in the doLogout. But, doLogout is only being called by doLogin() and in doAddPerson().
What is the best way to address this problem? Do I call doLogout() at the end of each benchmark operation function (i.e, in doTagSearch(), etc)? I feel that if I do that, it breaks the realism of the simulation/benchmark run.
In Faban, how does it determine or what constitutes a "session". I would think a session is something like a user going to a website, browsing a couple of the pages within that site and then leaving. Ideally, what we want is having something like that, with the leaving part corresponding to calling the doLogout method. 





Thanks,
-Harold
--- On Fri, 11/6/09, Akara Sucharitakul <[email protected]> wrote: 


From: Akara Sucharitakul <[email protected]>
Subject: Re: Question about Faban/workload driver + multiple Glassfish servers 
To: "Harold Lim" <[email protected]>
Date: Friday, November 6, 2009, 4:13 PM
OK, with that version it is probably
harder to achieve what you're trying to do (go through switches). Check out the new 
benchmark class.

-Akara

Harold Lim wrote:

Hi Akara,

Yes. I built my olio package from the Java source (a

few months back).

-Harold
--- On Fri, 11/6/09, Akara Sucharitakul <[email protected]>

wrote:

From: Akara Sucharitakul <[email protected]>
Subject: Re: Question about Faban/workload driver

+ multiple Glassfish servers

To: "Harold Lim" <[email protected]>
Date: Friday, November 6, 2009, 3:11 PM
Sorry, I meant the Olio kit. It is
the Olio benchmarking process that causes this issue.

-Akara

Harold Lim wrote:

Hi Akara,

I'm using the faban binary you gave me last

September

19 with the load variation fix.

-Harold
--- On Fri, 11/6/09, Akara Sucharitakul <[email protected]> 
wrote:

From: Akara Sucharitakul <[email protected]>
Subject: Re: Question about Faban/workload

driver

+ multiple Glassfish servers

To: [email protected]
Date: Friday, November 6, 2009, 2:47 PM
Hmmm, based on previous questions I
thought you were on the latest and pretty much in-sync with the repository.
Apparently not. 
OlioBenchmark.configure no longer makes a

call to

getFile.

This has been eliminated in favor of the Faban

services/tools

infrastructure we had in place lately.

Did you build the kit yourself? Or is this

based

on a

released kit. Thanks.

-Akara

Harold Lim wrote:

Hi Akara,

Here is the stack trace:

Logger:

com.sun.faban.harness.engine.GenericBenchmark
Thread Class 
Method
11 
com.sun.faban.harness.engine.GenericBenchmark

      start

Exception:
Message:


com.sun.faban.harness.FabanHostUnknownException:

Host

xxx.xxx.xxx.xxx not found!

Stack Trace:
Class Method 
Line

com.sun.faban.harness.engine.CmdService
get 
    1276
com.sun.faban.harness.RunContext 
getFile     346

org.apache.olio.workload.harness.OlioBenchmark
configure 
    107


com.sun.faban.harness.engine.InterfaceBenchmarkWrapper
configure 
    56

com.sun.faban.harness.engine.GenericBenchmark
start 
    264

com.sun.faban.harness.engine.RunDaemon
run 
    338
java.lang.Thread 
   run

      619

Thanks!
-Harold

--- On Thu, 11/5/09, Akara

Sucharitakul <[email protected]>

wrote:

From: Akara Sucharitakul <[email protected]>
Subject: Re: Question about

Faban/workload

driver

+ multiple Glassfish servers

To: [email protected]
Date: Thursday, November 5, 2009,

4:37 PM

Can you get me the stack trace?
Thanks.

-Akara

Harold Lim wrote:

Hi Akara,

When I set hostConfig/enabled

to

false, I am

getting

FabanUnknownHostException pointing

to the

address

of the

switch. But If I set it to true,

it fails

because

it is not

able to connect to the agent

(which I

don't have)

in the

machine that has the switch.

-Harold

--- On Fri, 10/30/09, Akara

Sucharitakul

<[email protected]>

wrote:

From: Akara Sucharitakul

<[email protected]>

Subject: Re: Question

about

Faban/workload

driver

+ multiple Glassfish servers

To: [email protected]
Date: Friday, October 30,

2009,

7:56 PM

Lets say it has not been

tested

this

way. It certainly cannot

dynamically add

servers

into the

driver. But you can use a

switch

that

allows

dynamic

addition of the servers.

If you

want

stats

collection for

all the servers behind

that

switch, we may

need to

add an

explicit URL field in the

configuration

(which

will default

to the web servers if left

blank.

If

that's not

needed, just

specify the single server

representing the

switch

and set

hostConfig/enabled to

false to

prevent

Faban

starting an

agent there. Thanks.

-Akara

Harold Lim wrote:

Hi,

Does the workload

driver

supports

dynamically

adding a

glassfish server, while a

benchmark test

is

running?

Currently, I specify

all the

glassfish

servers

in the

host:pair field of the web

server

tab.

If not, is there any

way

around it? Do

you

have any

ideas of how to deal with

adding

or

removing

glassfish

servers dynamically?

-Harold

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