David,
If the admin interface displays that the cache has been flushed
successfully, which it will if there was no communication between your
mid-tier admin client and the mid-tier server, it does not mean the
operation as a whole is complete.. That message should have been rephrased
something in the lines of "Your request to cache the server has been sent
successfully, the operation has begun but not compete. It may take a few
minutes to a few hours to complete.."
If you look at the cache directory on the mid-tier server, you will notice
the files there continuously growing and new files being created. That is
the result of the real caching process which is still work in progress..
When there is no activity in this directory, it is an indication of the
operation being complete..
Joe
-----Original Message-----
From: David Durling
Sent: Monday, March 26, 2012 4:32 PM Newsgroups:
public.remedy.arsystem.general
To: arslist@ARSLIST.ORG
Subject: Re: Effects of flushing midtier cache
Good to know, though in our case we have a small installation: just custom
AR System forms with up to 60-70 users at a time, and when I've flushed the
cache the action only seems to take a few seconds.
The points about production changes are good ones.
Thanks,
David
-----Original Message-----
From: Action Request System discussion list(ARSList)
[mailto:arslist@ARSLIST.ORG] On Behalf Of Goodall, Andrew C
Sent: Monday, March 26, 2012 4:24 PM
To: arslist@ARSLIST.ORG
Subject: Re: Effects of flushing midtier cache
If you have the full ITSM suite, then in my experience it takes about 1
hour to
completely recache (just over 1 GB of cache) and for CPU consumption to
fall
back within normal range.
That is not a "brief" disruption :)
Regards,
Andrew Goodall
Software Engineer 2 | Development Services | jcpenney . www.jcp.com
-----Original Message-----
From: Action Request System discussion list(ARSList)
[mailto:arslist@ARSLIST.ORG] On Behalf Of Joe Martin D'Souza
Sent: Monday, March 26, 2012 3:19 PM
To: arslist@ARSLIST.ORG
Subject: Re: Effects of flushing midtier cache
When would you need to flush cache? The obvious answer is when there is a
workflow change on production.. Changes to workflow are done whenever
there is need for code change for enhancement or bug fixes.. The general
industry practice is to manage these changes in a change window, where
there is a
scheduled outage, which is typically scheduled on weekends or the least
productive hours of an organization. So cache should be flushed during
these
changes.
That being said, there may be emergency changes that were a result of a
part
or whole system being rendered unusable pending that change. On such an
event it would be ok to flush your cache after fixing whatever the
problem/bug/enhancement was.
Yes flushing cache during production hours may cause a brief negative
impact
on users using the system at the time of the change.
Joe
-----Original Message-----
From: David Durling
Sent: Monday, March 26, 2012 3:48 PM Newsgroups:
public.remedy.arsystem.general
To: arslist@ARSLIST.ORG
Subject: Effects of flushing midtier cache
Hi,
I'm one of those that has found it necessary to use the "flush cache"
button
in the mid tier config when sometimes certain changes aren't picked up at
the regular cache check interval.
Do you all consider a flush of the mid tier cache to be unintrusive -
something
that can be done during production hours? Or is it something that should
be
done off-hours?
On our server I don't notice performance issues in using it, and in what
little testing I've done, user sessions seem to be uninterrupted. (I'm
not sure
about floating users on the web, though - if there's anything to consider
there.)
I'm on ARS 7.5 patch 007 with mid tier 7.5 patch 007 with apache/tomcat.
Thanks,
David
---
David Durling durl...@uga.edu
Enterprise IT Services
University of Georgia
_______________________________________________________________________________
UNSUBSCRIBE or access ARSlist Archives at www.arslist.org
attend wwrug12 www.wwrug12.com ARSList: "Where the Answers Are"
