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A large number of members and online users [message #1735053]

Wed, 15 June 2016 01:53

David Lee

Messages: 78
Registered: May 2013

Member

Hi,

In case of a Time Attendance Management/Payroll System for an organization with 50,000 employees, which must allow 5,000 users to online use simultaneously without waiting!

If developing a RAP application for that, what are the ideas and approaches?
The detailed, the better! Thank you!

Best,
David

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Re: A large number of members and online users [message #1735064 is a reply to message #1735053]

Wed, 15 June 2016 07:35

Ivan Furnadjiev

Messages: 2426
Registered: July 2009
Location: Sofia, Bulgaria

Senior Member

Hi David,
in RAP 3.x we worked hard to improve the performance [1]. Our latest
tests have been performed with up to 2000 concurrent sessions and shown
a stable behavior (response times). Ofcourse everything depends on the
hardware/software server configurations. The important part is to use
the new G1 garbage collector like mentioned in [1].

[1] http://eclipsesource.com/blogs/2015/06/25/rap-3-0-performance/
Regards,
Ivan

--
Ivan Furnadjiev

Twitter: @EclipseRAP
Blog: http://eclipsesource.com/blogs/

Professional services for RAP and RCP?
http://eclipsesource.com/services/rap/

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Re: A large number of members and online users [message #1735145 is a reply to message #1735064]

Wed, 15 June 2016 19:42

David Lee

Messages: 78
Registered: May 2013

Member

Hi, Ivan,

Thank you for your quick reply!

For 5000 concurrent sessions, is it possible to utilize such as a RAP sever cluster instead? for example, 5 servers together, each of them shares 1000 concurrent sessions! Is it possible doing so? If yes, will it be significantly helpful in this case?

I am actually not familiar with hardware, and trying to find out a good solution for big number of concurrent sessions!

In my opinion, RAP is really superb, thank you for your efforts!

Best,
David

[Updated on: Wed, 15 June 2016 19:53]

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Re: A large number of members and online users [message #1735242 is a reply to message #1735145]

Thu, 16 June 2016 14:50

Markus Knauer

Messages: 179
Registered: July 2009

Senior Member

Hi David,

thank you for the flowers, always appreciated!

For 5.000 concurrent users I would definitively suggest to use a cluster of servers with a load balancer as a front-end. This is a scenario that is advisable in most professional cases. Usually you will use sticky sessions (i.e. the requests from a single user are always routed to the same (RAP) backend server) with an Apache, nginx, or any other load balancer as frontend.

But even with multiple backend servers it is advisable to watch the memory consumption of a single user session from the very beginning in the development cycle. If it turns out that you need 5 MB for every user session, you will need... a lot of RAM in your server(s). If you need 50 MB you will need even more. And if you have memory leaks you will need more and more memory over time. How much memory really depends on your application code.

Since your application sounds very much like a commercial application, I would think about having a support contract, e.g. https://marketplace.eclipse.org/content/eclipsesource from the Eclipse Long Term Support (LTS). I'm mentioning this because most people just do not know that there is something like this available for Open Source software.

Thanks,

Markus

--

Twitter: @mknauer23 and @EclipseRAP
Blog: http://eclipsesource.com/blogs/

Professional services for RAP and RCP?
http://eclipsesource.com/services/rap/

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Re: A large number of members and online users [message #1735386 is a reply to message #1735242]

Sat, 18 June 2016 03:50

David Lee

Messages: 78
Registered: May 2013

Member

Hi Markus,

Thank you for your information!

Best,
David

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Re: A large number of members and online users [message #1735556 is a reply to message #1735064]

Tue, 21 June 2016 07:21

Karl Mehltretter

Messages: 9
Registered: May 2016

Junior Member

Ivan Furnadjiev wrote on Wed, 15 June 2016 07:35

H The important part is to use
the new G1 garbage collector like mentioned in [1].

[1] http://eclipsesource.com/blogs/2015/06/25/rap-3-0-performance/
Regards,
Ivan

With the G1 collector, you can also use the "String deduplication" feature to reduce memory footprint.
http://java-performance.info/java-string-deduplication/.
I wonder how this feature helps with a typical RAP application.

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Re: A large number of members and online users [message #1735560 is a reply to message #1735556]

Tue, 21 June 2016 07:38

Ivan Furnadjiev

Messages: 2426
Registered: July 2009
Location: Sofia, Bulgaria

Senior Member

Hi,
that's really interesting. Next time when we do the load testing we will
try this option. Thanks for the tip.
Regards,
Ivan

--
Ivan Furnadjiev

Twitter: @EclipseRAP
Blog: http://eclipsesource.com/blogs/

Professional services for RAP and RCP?
http://eclipsesource.com/services/rap/

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Re: A large number of members and online users [message #1808072 is a reply to message #1735560]

Mon, 17 June 2019 06:39

Stenile Martein

Messages: 1
Registered: June 2019

Junior Member

Do you have some more requirements?

- Is it just a simple like in or out of office?
- Do you want to have categories like (absence, leave, holiday)?
- Do the employees manage that themselves?
- Do you need some kind of workflow for managers or supervisors?
- Does it need be for certain time periods?

And how do you currently manage the attendance. I'm interested what the current situation is?

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