On 07/09/2010 08:30 AM, Marcin Bazydlo wrote:
On 07/09/2010 03:47 PM, Jason wrote:
> Can you try testing a static page (html) and limiting your connects
> to 1-10 so you can debug at least.
Yes on Monday Szymon will do two more tests:
- static page
- page that is dynamic but doesn't change content
Also, try turning these on for testing in the mean time
proxy.config.http.cache_urls_that_look_dynamic 1
proxy.config.http.cache.http 1
Sure we turned those on (as shown in configs from first mail :-)).
Context is following that we want to cache REST service.
And content is changed only through POST, PUT and DELETE. So we made
those configurations changes as first thing :-D.
I addition to what Jason said, a few things to try:
1) Make sure traffic_cop isn't killing traffic_server. I had this
happen to me once, and it shows up as if the cache is blown away
(because the directory is never flushed to disk). This could happen if
the health check from traffic_cop to traffic_server fails. This is easy
to see, for example, just check the "start" time of traffic_server vs
traffic_manager (they should usually be the same).
2) I'd really like to see the complete header from the Origin server, to
make sure there is nothing in the response that prevents TS from caching
the response.
3) Finally, an extremely useful debugging tool is to run traffic_server
with the debug tracer enabled. You can do that via records.config, or,
which is what I usually do, from command line. For example, a good
diagnostic tracer for you to try is
$ sudo /usr/local/bin/traffic_server -T 'http.*'
The output from this will be pretty verbose, so just send one request
through the system, and step through all the diagnostics.
As a side note; The argument to -T (or the records.config setting) is a
regular expression, and when enabled, all tracer messages that matches
that regex is displayed. With tracers disabled (the default), the
overhead of having these diagnostics messages in the code is virtually
zero, but when enabled, it gets very, very expensive (so never run with
it enabled in production).
Cheers,
-- leif
