Thanks Jan for your explanation. I do understand the difference for
the two strategies. However, my point was that the page is still
serving the old content even after an activation for both strategies
after half an hour. That is why I turned off the browser cache to
make sure it's not the browser. I tried the "Never" for browser cache
configuration and it's still giving me the same behavior. Therefore,
I wonder what else i could try because I can't expect users to clear
their browser cache to view the latest content. Magnolia 3.6.1
actually does show the modified content after an activation for
ServeUntilRecachedCachePolicy, but not for EagerRecacheCachePolicy. I
wonder if anyone else encounters the same issue or just me not
knowing how to configure.
To recap, my only problem to the strategies: how can users view the
latest content without clearing their browser cache?
Both strategies are brilliant ideas and I truly want to apply them.
Any hints would be greatly appreciated.
Thanks again,
Po Ki
On Oct 9, 2008, at 2:11 AM, Jan Haderka wrote:
On Wed, 2008-10-08 at 15:56 -0400, Po Ki Chui wrote:
Hi all,
I am trying to use either ServeUntilRecachedCachePolicy or
EagerRecacheCachePolicy. I upgraded to 3.6.3 for testing. I setup the
Both of the policies mentioned above will cause server to serve old
content until cache content is updated to prevent spikes in load on a
server due to flushing cache immediately.
ServeUntilRecachedCachePolicy is useful when you have lots of heavy
weight content, for example when you generate images from the
content or
other CPU intensive transformations. It will ensure that when first
client requests the page after activation, such request triggers
generation of the page, but if second client comes with the request
for
the same page and generation of the page is not finished yet, magnolia
will serve old version of the page not to block this client. From
client
perspective it is like the page was activated it later then it was in
reality, but site is much more responsive even immediately after
activation.
EagerRecacheCachePolicy. goes even one step further. It keeps list of
top X (100 by default) served pages and after activation it will
initiate http requests to be the
first-client-who-takes-the-penalty-for-generating-the-page for all the
pages from top list. And only after that it will flush the rest of the
pages from the cache.
Those policies were developed to cover some rather specific needs
and in
most cases unless you are running really high loads you do not need to
them at all.
Please read the advanced cache documentation. The above mentioned is
explained there
http://documentation.magnolia.info/modules/advanced-cache.html
browser cache expirationMinutes to 0. However, after an activation,
Rather then that change the BrowserCachePolicy to "Never" instead of
"Fixed".
Magnolia still shows the stale cache. I must clear my browser cache
If you have to clear the browser cache, then it is not Magnolia that
shows the stale cache.
to see the up-to-date pages. I'd like to see the up-to-date pages
after an activation without clearing the browser cache. Please
advise.
A side question.... I remember Magnolia 3.6 has a way to decouple
activation and cache clearing. How do you set that up?
Not sure what you mean. You can write your own policy and do what ever
you want. If all you want is to flush the cache manually, at any time,
you can use jmx (there is a mbean for ehcache to do so).
HTH,
Jan
Thanks,
Po Ki
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Best regards,
Jan Haderka
Magnolia International Ltd.
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