On Sat, Jan 2, 2010 at 7:17 AM, Nathan Parry npa...@gmail.com wrote:
Jetty seems to do questionable things with filehandles, opening
multiple copies of the same template file and keeping them open too
long. Setting ulimit fixes the issue of Too many open files
exceptions failed requests, but it still seems like at most
templates should need 1 access to check mtime. Not really a lift
issue, and not a deal breaker for us to switch to a different
servlet
container, but I am curious to see what the eventual solution for
comet performance is.
If you can put together a reproducible case on this, we'll see what
we
can
do to close stuff that Jetty hands us more explicitly.
I'm a total Lift and Scala newbie, but file-handle problems and last-
modified checks remind me of this bug in Facelets:
https://facelets.dev.java.net/issues/show_bug.cgi?id=278
Thanks. Looks like you found a defect and I've opened a defect.
In case it is helpful, I think you can reproduce the behavior by doing
something like this:
1. mvn jetty:run
2. Figure out the pid for jetty
3. Figure out how many file descriptors are open after startup using:
lsof | grep pid | wc -l
4. Run a command like the one copied below to request the same file
over and over.
5. Run the lsof command line every few seconds to watch the FD count.
Sample command to fetch a file in a loop:
while (`true`); do curl -H If-Modified-Since: Tue, 29 Dec 2009
20:02:16 UTC -H Cache-Control: max-age=0
http://localhost:8080/classpath/blueprint/screen.css;
done
Running this locally the FD count seems to fluctuate between the
baseline count and around 2x the baseline. I would guess that might
be based on how frequently the garbage collector is running and
cleaning up any connections that were not explicitly closed.
Nathan,
Now don't take this the wrong way, but I could kiss you. ;-)
This is a great defect report... it's led to:
http://github.com/dpp/liftweb/issues/#issue/275
As well as a fix that I'm posting to review board right now.
Thanks,
David
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Nathan
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