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RE: [grouper-users] question.....

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  • From: "Hyzer, Chris" <>
  • To: "Black, Carey M." <>, " Mailing List" <>
  • Subject: RE: [grouper-users] question.....
  • Date: Wed, 10 Jul 2019 14:43:24 +0000

We need to address this at some point. You don't need to have different
locations since it uses unique file names, right? You should delete old
files from this folder. There are not any performance tuning suggestions,
the defaults are set for large and small envs alike.


-----Original Message-----
<> On Behalf Of Black, Carey M.
Sent: Tuesday, July 09, 2019 11:34 PM
To: Mailing List <>
Subject: [grouper-users] question.....

Some time back I found ehcache temp files stacking up and I decided to push
them off to a different filesystem to avoid "out of space" issues where they
were being spawned.
When I did that I also ( maybe unjustifiably ) decided that the UI, WS and
daemon JVM's should have independent locations for their disk based (L2)
cache files.

I did a bit of "light reading" on the topic and it appears that: ( REF: )
Is it thread-safe to modify element values after retrieval from a Cache?
Remember that a value in a cache element is globally accessible from multiple
threads. It is inherently not thread-safe to modify the value. It is safer to
retrieve a value, delete the cache element, and then reinsert the value.

So.. my questions.

1) Should the separate JVM's ( UI/WS/daemon, all on the same host ) use
separate cache file locations? ( Is it reasonable to be concerned about this
detail? )
2) Are there any performance tuning suggestions about grouper's use of
ehcache? ( other than file store location(s). )
Maybe things like....
If you have "X" in your grouper then you should likely set
"yyy.maxElementsInMemory" to 30% of "X".
Don't mess with the defaults, they scale well and you might
break something if you go mucking about in there...


Carey Matthew

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