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From Christopher Schultz <ch...@christopherschultz.net>
Subject Re: Skip resource path in TLD scanner?
Date Fri, 17 Nov 2017 18:26:00 GMT
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Matt,

On 11/16/17 12:11 PM, Matt Cosentino wrote:
> This keeps getting worse, my site was down for over a minute while 
> the TLD scanner ran. There must be something I can do.
If you need taglibs, you'll need to do TLS scanning. There really is
no way to avoid that that I know of. One of many reasons I don't like
JSP as a technology.

If you are having a problem with downtime, you have other options that
might help in other areas. For example, you could set up a second
server and load-balance between the two of them. This protects you
from a number of downtime-causing issues such as power failures, JVM
crashes, and -- as in your example here -- planned maintenance.

Running a single instance of your application in a production
environment where uptime matters is really not an appropriate
solution. If you had two servers, your application's restart time
would not have been an issue.

- -chris

> -----Original Message----- From: Mark Thomas
> [mailto:markt@apache.org] Sent: Saturday, April 29, 2017 5:02 AM 
> To: Tomcat Users List <users@tomcat.apache.org> Subject: Re: Skip
> resource path in TLD scanner?
> 
> On 28/04/17 17:00, Matt Cosentino wrote:
>> Yes, it's other folders within WEB-INF. I turned on the
>> TldScanner logging and it is definitely what is causing the
>> delay. My situation probably isn't very typical. The delay varies
>> in my various web applications, the worst being about 20 seconds.
>> It all adds up though, and every second counts when our sites are
>> down.
> 
> There is a solution available but it is intended more for the
> embedded use case rather than a standard Tomcat install. Using it
> in a standard install would require (effectively) patching Tomcat.
> 
> The general idea would be to use the TldPreScanned class. That does
> require all the TLDs to be listed in advance. On the plus side, no
> scanning delay. On the down side, adding TLDs requires code
> changes. Doing this with a standard Tomcat install requires changes
> to the JasperInitializer (hence the patch). I don't think there is
> a pure config way around that but I'll look into it.
> 
> A better solution would probably be to make it easier to plugin in
> a custom TLDScanner - i.e. purely with config. If you'd like us to
> explore this option we should re-open 61052 and adjust accordingly.
> I don't think there is enough demand for filtering resource paths
> to make that worth implementing.
> 
> One final thought. Are you running the web application from a WAR
> or an expanded directory? (The latter would be faster).
> 
> Mark
> 
> 
> 
>> 
>> - Matt
>> 
>> 
>> -----Original Message----- From: Mark Thomas
>> [mailto:markt@apache.org] Sent: Friday, April 28, 2017 7:28 AM
>> To: Tomcat Users List <users@tomcat.apache.org> Subject: Re: Skip
>> resource path in TLD scanner?
>> 
>> On 27/04/17 23:39, Matt Cosentino wrote:
>>> https://tomcat.apache.org/tomcat-8.0-doc/config/systemprops.html
>>>
>>>
>>> 
There is one for skipping jar files:
>>> 
>>> tomcat.util.scan.StandardJarScanFilter.jarsToSkip
>> 
>> <snip/>
>> 
>>> It skips /WEB-INF/classes/ and /WEB-INF/lib/, but it does not
>>> check any property to skip user defined paths.
>> 
>> Is it other paths within WEB-INF you need to skip?
>> 
>> When I read "skipping resource paths" I was thinking of skipping
>> the various places where Tomcat treat directories as JARs that
>> then get scanned for TLDs (which can be configured via the
>> JarScanner). But it sounds like skipping those won't help you.
>> 
>> How sure are you that it is checking the directories below
>> WEB-INF that is the cause of the delay? That isn't a typical
>> source of start-up delay although it is certainly possible.
>> 
>> Finally, what sort of delay are we talking out here? Seconds? 
>> Minutes?
>> 
>> Mark
>> 
>> 
>>> -----Original Message----- From: Mark Thomas 
>>> [mailto:markt@apache.org] Sent: Thursday, April 27, 2017 5:05
>>> PM To: Tomcat Users List <users@tomcat.apache.org> Subject: Re:
>>> Skip resource path in TLD scanner?
>>> 
>>> On 27/04/17 21:17, Matt Cosentino wrote:
>>>> I need to skip some of the resource paths within WEB-INF. I
>>>> know there's a property for skipping jar files, but I
>>>> couldn't find one for resource paths. I reported this as a
>>>> bug and was told that the property exists. Where is it?
>>> 
>>> Where have you looked?
>>> 
>>> Mark
>> 
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> 
> 
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