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Message-ID: <27119.70251.qm@web38701.mail.mud.yahoo.com>
Date: Tue, 18 Aug 2009 06:47:53 -0700 (PDT)
From: Aaron Smuts <asmuts@yahoo.com>
Subject: Re: Indexed Disk Cache and MaxPurgatorySize
To: JCS Users List <jcs-users@jakarta.apache.org>
In-Reply-To: <4A8A5FD5.5000701@ipsoft.it>
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Purgatory is a queue with a size limit.  If you exceed the size, by putting=
 a very large number of elements in faster than they can be written to disk=
, then the oldest will be expelled.  They won't make it to disk, as they've=
 been dropped from the queue.=0A=0AThe danger in having an unlimited queue =
is that you could run out of memory if there is a tremendous spike. . . .=
=0A=0AWe need some utility for creating a disk files and then telling the d=
isk cache to use them  . . . =0A=0AAaron=0A=0A--- On Tue, 8/18/09, Silvano =
<mele@ipsoft.it> wrote:=0A=0A> From: Silvano <mele@ipsoft.it>=0A> Subject: =
Indexed Disk Cache and MaxPurgatorySize=0A> To: "JCS Users List" <jcs-users=
@jakarta.apache.org>=0A> Date: Tuesday, August 18, 2009, 1:01 AM=0A> Dear A=
ll,=0A> =0A> I'm using the Indexed Disk Cache in my application and I=0A> e=
ncountered some strange behavior that I try to summarize=0A> following.=0A>=
 =0A> The steps are:=0A> 1. I fill in the cache using a preliminary job whi=
ch goal=0A> is to "warm-up" the cache.=0A> 2. When I try to retrieve the sa=
me items put in cache=0A> during the step one, it seems they are not in cac=
he, or at=0A> least some of them are missing.=0A> REMARK: As you can see in=
 the configuration chunk below,=0A> the elements are eternal.=0A> =0A> I ha=
ve already found a problem in the "MaxKeySize"=0A> parameter that was too s=
mall, but after fixing it, the=0A> problem is still there :-(=0A> =0A> So m=
y questions are:=0A> 1. Is it possible that the "MaxPurgatorySize" can lead=
 to=0A> this kind of problem? I set it to 5000=0A> 2. What are the drawback=
s if I set "MaxPurgatorySize" equal=0A> to -1 (infinite)? Is there the risk=
 to obtain memory=0A> exceptions?=0A> 3. What are your suggestions to debug=
/solve the problem?=0A> =0A> Following some details of the configuration:=
=0A> =0A> # DEFAULTS=0A> jcs.default=3DDC=0A> jcs.default.cacheattributes=
=3Dorg.apache.jcs.engine.CompositeCacheAttributes=0A> jcs.default.cacheattr=
ibutes.MaxObjects=3D1000=0A> jcs.default.cacheattributes.DiskUsagePatternNa=
me=3DUPDATE=0A> =0A> # REGION=0A> jcs.region.Common=3DDC=0A> jcs.region.Com=
mon.cacheattributes=3Dorg.apache.jcs.engine.CompositeCacheAttributes=0A> jc=
s.region.Common.cacheattributes.MaxObjects=3D50=0A> jcs.region.Common.cache=
attributes.MemoryCacheName=3Dorg.apache.jcs.engine.memory.lru.LRUMemoryCach=
e=0A> jcs.region.Common.cacheattributes.UseMemoryShrinker=3Dtrue=0A> jcs.re=
gion.Common.cacheattributes.MaxMemoryIdleTimeSeconds=3D30=0A> jcs.region.Co=
mmon.cacheattributes.ShrinkerIntervalSeconds=3D20=0A> =0A> jcs.region.Commo=
n.elementattributes=3Dorg.apache.jcs.engine.ElementAttributes=0A> jcs.regio=
n.Common.elementattributes.IsEternal=3Dtrue=0A> =0A> jcs.region.Common.elem=
entattributes.IsSpool=3Dtrue=0A> jcs.region.Common.elementattributes.IsRemo=
te=3Dfalse=0A> jcs.region.Common.elementattributes.IsLateral=3Dtrue=0A> =0A=
> # AUX=0A> jcs.auxiliary.DC=3Dorg.apache.jcs.auxiliary.disk.indexed.Indexe=
dDiskCacheFactory=0A> jcs.auxiliary.DC.attributes=3Dorg.apache.jcs.auxiliar=
y.disk.indexed.IndexedDiskCacheAttributes=0A> jcs.auxiliary.DC.attributes.D=
iskPath=3D/usr/local/ptt/liferay/pttCache=0A> jcs.auxiliary.DC.attributes.M=
axPurgatorySize=3D5000=0A> jcs.auxiliary.DC.attributes.MaxKeySize=3D1000000=
=0A> =0A> =0A> If You need the full .ccf I can send you!=0A> =0A> Thanks in=
 advance,=0A> =A0=A0=A0Silvano.=0A> =0A> =0A> =0A> ------------------------=
---------------------------------------------=0A> To unsubscribe, e-mail: j=
cs-users-unsubscribe@jakarta.apache.org=0A> For additional commands, e-mail=
: jcs-users-help@jakarta.apache.org=0A> =0A> 

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