Caching on AEM Cloud publish adobeaemcloud.com domain

[NageshRaja]

Hey guys,

I am having an issue when I try to access the publish domain https://publish-p00001-e000002.adobeaemcloud.com/content/appName/en/shopping-cart.html

The changes pushed from the author are only visible in publish domain URL when I try to access through the query parameters.

Checking the logs I see the below -

1. aemdispatcher logs - 
   [27/Nov/2024:07:06:44 +0000] [I] [cm-p00001-e00002-aem-publish-749967f856-nbzdf] "GET /content/appName/en/shopping-cart.html" - 11ms [publishfarm-marks/-] [actionhit] publish-p00001-e00002.adobeaemcloud.com
   The request with no query params is being served from dispatcher even after having the cache cleared.
   [27/Nov/2024:07:07:15 +0000] [I] [cm-p00001-e00002-e00002-publish-749967f856-nbzdf] "GET /content/appName/en/shopping-cart.html?nocache=trueCL" 200 326ms [publishfarm-marks/0] [actionnone] publish-p00001-e00002.adobeaemcloud.com
   
   
2. httpd error logs -
   Wed Nov 27 07:06:44.810984 2024 [dispatcher:debug] [pid 627:tid 764] [cm-p00001-e00002-aem-publish-749967f856-nbzdf] checking [/content/appName/en/shopping-cart.html]
   Wed Nov 27 07:06:44.811002 2024 [dispatcher:debug] [pid 627:tid 764] [cm-p00001-e00002-aem-publish-749967f856-nbzdf] never flushed [/mnt/var/www/html/content/appName/.stat] -> use cache [/mnt/var/www/html/content/appName/en/shopping-cart.html]
   Wed Nov 27 07:06:44.811007 2024 [dispatcher:debug] [pid 627:tid 764] [cm-p00001-e00002-aem-publish-749967f856-nbzdf] cache-action for [/content/appName/en/shopping-cart.html]: DELIVER
   Wed Nov 27 07:06:44.811009 2024 [dispatcher:debug] [pid 627:tid 764] [cm-p00001-e00002-aem-publish-749967f856-nbzdf] request declined
   Wed Nov 27 07:06:44.811058 2024 [dispatcher:debug] [pid 627:tid 764] [cm-p00001-e00002-aem-publish-749967f856-nbzdf] response.headers[Content-Type] = "text/html;charset=utf-8"
   Wed Nov 27 07:06:44.811064 2024 [dispatcher:debug] [pid 627:tid 764] [cm-p00001-e00002-aem-publish-749967f856-nbzdf] response.headers[X-Content-Type-Options] = "nosniff"

Why would the logs show the /content/appName/.stat as never flushed when we flushed a child page underneath it?

Is it because of the statfiles level? Its currently set to "2". Do we need to increase it to 3 or 4? How to determine that based on the current node hierarchy?

/statfileslevel "2"

[daniel-strmecki]

Hi @NageshRaja,

There is definietly a problem with your Dispatcher cache not being flushed. Can you confirm that you defined the statfilelevel in the invalidation.farm? As that is the farm used for Dispatcher flush/invalidation requests.

The statfilelevel starts from your DOCROOT, so it looks fine. In the aemdispatcher logs, you should see a HIT or MISS for each request you make. That is how you know if the HTML is served from Dispatcher cache or not.

I suggest you look at the logs of your cache invalidation requests. Also, I suggest you debug the issue on a local Dispatcher instance.

Good luck,

Daniel

[NageshRaja]

hey @daniel-strmecki - I do see hit and miss requests - the requests with query params are reported as [actionhit] while those without are reported as [actionmiss]

I am getting validator issues in my current dispatcher folder - mostly symlinks are not present at enabled vhosts - they are an exact replica of the available vhosts.

[daniel-strmecki]

Hi @NageshRaja,

it should be vice versa, requests with query params should be a MISS. Here is a shell script for you to fix symlinks:

cd ..
project_root=$(pwd)
cd dispatcher/src/conf.d/enabled_vhosts
enabled_hosts=$(ls *.vhost)
for host in $enabled_hosts; do
	rm $host
	ln -s ../available_vhosts/$host $host
done

cd $project_root
cd dispatcher/src/conf.dispatcher.d/enabled_farms
enabled_farms=$(ls *.farm)
for farm in $enabled_farms; do
	rm $farm
	ln -s ../available_farms/$farm $farm
done

Hope this helps,

Daniel

[aanchal-sikka]

@NageshRaja 

Symlinks are not needed which flexible Mode of AEM Dispatcher. Details available on: https://experienceleague.adobe.com/en/docs/experience-manager-cloud-service/content/implementing/con... 

Please verify, if opt-in/USE_SOURCES_DIRECTLY is configure in dispatcher. If yes, symlinks are not needed.

-------

For cached URL with query params, please review if ignoreUrlParams  is configured. https://experienceleague.adobe.com/en/docs/experience-manager-dispatcher/using/configuring/dispatche... 

[aanchal-sikka]

@NageshRaja 

Please enable debug logs on the dispatcher. Publish the child page and validate dispatcher logs. The details on how the logs should look like are available on link

For reference, copying the relevant logs here as well:

With statfilelevel 2, the .stat file would have been created on:

docroot

/content

/content/appName

And any publish on Child-page should touch all .stat files along this path. For better understanding, refer to link

[NageshRaja]

thanks for replying @aanchal-sikka , however referring to your screenshot I see the logs "Touched /mnt/var.." logged as Info and not Debug.
We have already defined the log level as debug and still not getting the logs you mentioned -

Define DISP_LOG_LEVEL debug

[Rohan_Garg]

Hey @NageshRaja,
The stat file level is set adequately. Can you share the vhost config and cache rules?

[NageshRaja]

default aem_publish.vhost - there are other brand specific vhosts as well
Sent that to you in inbox masking the brands - please check

# Collect any enviromental variables that are set in /etc/sysconfig/httpd
# Collect the dispatchers number
PassEnv DISP_ID
<VirtualHost *:80>
    ServerName publish
    # Put names of which domains are used for your published site/content here
    ServerAlias    ${PUBLISH_DEFAULT_HOSTNAME}
    # Use a doc root that matches what's in the /etc/httpd/conf/publish-farm.any
    DocumentRoot   ${DOCROOT}
    # Add header breadcrumbs for help in troubleshooting
    <IfModule mod_headers.c>
          Header always add X-Vhost "publish"
          Header merge X-Frame-Options SAMEORIGIN "expr=%{resp:X-Frame-Options}!='SAMEORIGIN'"
          Header merge X-Content-Type-Options nosniff "expr=%{resp:X-Content-Type-Options}!='nosniff'"
       # Make sure proxies don't deliver the wrong content
       Header append Vary User-Agent env=!dont-vary
    </IfModule>
    <Directory />
       # Update /etc/sysconfig/httpd with setting the PUBLISH_WHITELIST_ENABLED from 0 or 1 to enable or disable ip restriction rules
       <IfModule disp_apache2.c>
          # Some items cache with the wrong mime type
          # Use this option to use the name to auto-detect mime types when cached improperly
          ModMimeUsePathInfo On
          # Use this option to avoid cache poisioning
          # Sling will return /content/image.jpg as well as /content/image.jpg/ but apache can't search /content/image.jpg/ as a file
          # Apache will treat that like a directory.  This assures the last slash is never stored in cache
          DirectorySlash Off
          # Enable the dispatcher file handler for apache to fetch files from AEM
          SetHandler dispatcher-handler
       </IfModule>
       Options FollowSymLinks
       AllowOverride None
       # Insert filter
       SetOutputFilter DEFLATE
       # Don't compress images
       SetEnvIfNoCase Request_URI \
       \.(?:gif|jpe?g|png)$ no-gzip dont-vary
    </Directory>
    <Directory "${DOCROOT}">
       AllowOverride None
       Require all granted
    </Directory>
    <IfModule disp_apache2.c>
       # Enabled to allow rewrites to take affect and not be ignored by the dispatcher module
       DispatcherUseProcessedURL  1
       # Default setting to allow all errors to come from the aem instance
       DispatcherPassError       0
    </IfModule>
    <IfModule mod_rewrite.c>
       ReWriteEngine  on
#      LogLevel warn rewrite:info
       # Global rewrite include
       # Update /etc/sysconfig/httpd with setting the PUBLISH_FORCE_SSL from 0 or 1 to enable or disable enforcing SSL
       <If "${PUBLISH_FORCE_SSL} == 1">
       </If>
    </IfModule>
</VirtualHost>