Interesting. See
http://www.masonhq.com/?FAQ:Caching
I've added the case you mentioned as something that can go wrong with
component caching.
Although even on a non-Mason or static site, it seems like you'd want
to avoid FTPing directly onto a production file, to prevent people
from getting the incomplete file. Using a temporary file seems wise.
Jon
On Aug 15, 2007, at 8:27 PM, Ken Kingsbury wrote:
Hi,
I've scanned the archives but can't see that my issue has been
talked about before... apologies if it has.
When new Mason-handled content is FTPed to our site we sometimes
see that the content served by Mason is incomplete or broken. When
we look at the source HTML it seems fine and if we touch the file
to force Mason to re-cache it, it fixes the incomplete/broken cache
file.
We speculate this is what's happening:
- an HTTP request for a file being FTPed is received by the web
server;
- Mason sees that the file has been updated and caches the file
before the FTP is complete;
- The FTP completes in the same second that Mason caches the file
so that in subsequent requests for the page Mason thinks its cache
is up-to-date (the last modified times of both the original and
cached files are the same) and continues to serve an incomplete/
broken page until we touch the original file, forcing Mason to re-
cache it.
Is this a sensible scenario? Are file last-modified times measured
in seconds (and not something more granular)?
Our intuition is that this is only happening with very popular
pages (subject to strict publishing deadlines --so it's important
they are not incomplete/broken)... it never seems to happen with
less visited pages. If there are many clients looking for a page
just at the time it's being published (FTPed) the chances of Mason
caching the file before it's completely FTPed seem good.
I now usually FTP to a temporary name and then rename the file to
its final name -- so that when Mason becomes aware of the updated
file the FTP is complete.
Any other thoughts or solutions would be welcome.
Thanks!
Ken Kingsbury
Bank of Canada
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