[Building Sakai] Memory leak in Courier Service

[Maurer, Christopher Wayne]

We restart weekly on Sunday mornings around 6am.  But Sunday evening is some of our heaviest load, so by around 8pm, memory is about at capacity and GC starts thrashing essentially causing the servers to die a slow horrible death!
So restarts don't really help us in this situation.  And if it can build up in a little over 12 hours, that doesn't seem like a slow leak.  Though, we are running lots of sessions when we hit peak load!

Chris

From: Matthew Jones <matthew at longsight.com<mailto:matthew at longsight.com>>
Date: Friday, September 20, 2013 11:12 AM
To: Beth Kirschner <bkirschn at umich.edu<mailto:bkirschn at umich.edu>>
Cc: Christopher Maurer <chmaurer at iu.edu<mailto:chmaurer at iu.edu>>, dev sakai <sakai-dev at collab.sakaiproject.org<mailto:sakai-dev at collab.sakaiproject.org>>
Subject: Re: [Building Sakai] Memory leak in Courier Service

Chat (new or old) still uses it, new presence was the one that got switched from using it.

It's still an issue but wasn't a huge/fast leak and basically just meant the best practice was weekly restarts for highly active instances.


On Fri, Sep 20, 2013 at 11:07 AM, Beth Kirschner <bkirschn at umich.edu<mailto:bkirschn at umich.edu>> wrote:
We're still using the old chat, though I thought that the Courier Service was deprecated and so not used by the old chat?

- Beth

On Sep 20, 2013, at 10:00 AM, "Maurer, Christopher Wayne" <chmaurer at iu.edu<mailto:chmaurer at iu.edu>> wrote:

> https://jira.sakaiproject.org/browse/SAK-21398
>
> We believe we've been running into this old-ish issue lately.  We upgraded to 2.9.0 back in May but didn't notice issues until load really picked up at the beginning of the fall semester a couple weeks ago.  Are other 2.9 people still running the "old" style chat or has everyone switched over to the "neo" chat (I've been out of the sakai game for pretty much the whole year…is it still called that?)  Trying to determine if the best course of action is to try and get the old one working better, or switch to the new.  Thoughts?
>
> Chris
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