Yes, it is the default loader.
-----Original Message-----
From: Mark Thomas <ma...@apache.org>
Sent: Wednesday, 9 October, 2019 15:57
To: users@tomcat.apache.org
Subject: Re: Tomcat discards and reloads the jar files from the webapps folder.
On 09/10/2019 13:04, Duca,Cristian wrote:
> Hello,
>
> I have tried adding the following property: backgroundProcessorDelay="90"
> This is an Attribute corresponding to the Engine
>
> I have added he setting as it follows in server.xml
> <Engine name="stp" defaultHost="localhost" jvmRoute="${jvm.route}"
> backgroundProcessorDelay="90">
>
> After the jvm has been initialized there was no impact in the jar
> discard/reload, tomcat9 does the same thing.
>
> I can tell you that looking in process explorer I can see that the jar files
> from the webapps folder are not being discarded on tomcat7.
>
> Note that: we have almost the same configuration(server.xml, context.xml,
> web.xml -> because these files are templated) coming from tomcat7 to tomcat9.
I'll ask again. Is this genuine class loading or is it something else?
Mark
>
> Thank you,
> Cristian Duca.
>
> -----Original Message-----
> From: Mark Thomas <ma...@apache.org>
> Sent: Wednesday, 9 October, 2019 14:47
> To: users@tomcat.apache.org
> Subject: Re: Tomcat discards and reloads the jar files from the webapps
> folder.
>
> On 09/10/2019 11:43, Duca,Cristian wrote:
>> Hello,
>>
>> The web application is trying to load specific classes from the jar files.
>
> Is this genuine class loading (in which case the response below is
> correct) or is the application reading the .class files as if they were
> resources (in which case a different answer applies)?
>
>> The main idea is that in tomcat7 the jar files were kept in memory and when
>> the web application required a specific class the jvm fetched it from memory.
>
> Not exactly. In Tomcat 7 JAR files are kept open for 90s by default before
> being closed and re-opened later if necessary.
>
>> With tomcat9 when the web application requires a specific class tomcat 9
>> will try to load the jar file which contains that class.
>
> Again, not exactly. In Tomcat 9 JAR files references are cleaned up by the
> background processing thread (that triggers various background tasks). By
> default this occurs every ~10s.
>
>> I would like to have the same behavior as we did in tomcat7, is this
>> possible?
>
> Yes, but...
>
> You probably only want increase this for a single / all web applications so
> you should set backgroundProcessorDelay="90" in the appropriate context.xml
> file. This will increase the time between all Context level background tasks
> so it will also impact:
>
> - reloading as a result of a modified JAR or class file (this feature is
> disabled by default)
>
> - session expiration
>
> - cleaning of the annotation cache
>
> The impact of these should be minimal but actual impact will depend on the
> application.
>
>
> The standard Manager implementation (via the processExpiresFrequency
> attribute) only checks session expiration every 6 calls to
> backgroundProcess(). We could add a similar option to StandardRoot that
> manages resources so that JAR were files open longer by default.
>
> Mark
>
>
>
>>
>> Thank you,
>> Cristian Duca.
>> -----Original Message-----
>> From: Mark Thomas <ma...@apache.org>
>> Sent: Wednesday, 9 October, 2019 13:39
>> To: users@tomcat.apache.org
>> Subject: Re: Tomcat discards and reloads the jar files from the webapps
>> folder.
>>
>> On 09/10/2019 11:36, Duca,Cristian wrote:
>>> Hello,
>>>
>>> We upgraded our tomcat from 7 to 9 and we observed the following:
>>>
>>> * In tomcat9 the jar files from the webapps folder are discarded and
>>> reloaded -> this creates extra input/output operations which increase our
>>> CPU Usage.
>>> * In tomcat7 the jar files were kept loaded in memory and were not
>>> discarded.
>>>
>>> I have tried adding the periodicEventDelay set to 0 or a negative value,
>>> but we have the same behavior.
>>>
>>> Can you please guide me what I can do to have the same behavior as we did
>>> with tomcat7.
>>
>> That depends what resources the web application is attempting to load from
>> the JAR files.
>>
>> Mark
>>
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