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From bugzi...@apache.org
Subject [Bug 50317] Possible error in mod_cache's "Avoiding the Thundering Herd"
Date Wed, 21 May 2014 07:16:02 GMT
https://issues.apache.org/bugzilla/show_bug.cgi?id=50317

--- Comment #29 from jkaluza@redhat.com ---
Ok, when reproducing it, I see following in tomcat log:

::1 - - [21/May/2014:03:06:05 -0400] "GET
/examples/jsp/jsp2/el/basic-arithmetic.jsp HTTP/1.0" 200 2152
::1 - - [21/May/2014:03:06:05 -0400] "GET
/examples/jsp/jsp2/el/basic-arithmetic.jsp HTTP/1.0" 200 2152

and following is relevant part of httpd error_log with patch from Comment 7:

[Wed May 21 03:06:05 2014] [debug] cache_util.c(596): Cache lock obtained for
stale cached URL, revalidating entry:
/examples/jsp/jsp2/el/basic-arithmetic.jsp
[Wed May 21 03:06:05 2014] [debug] cache_storage.c(272): Cached response for
/examples/jsp/jsp2/el/basic-arithmetic.jsp isn't fresh.  Adding/replacing
conditional request headers.
[Wed May 21 03:06:05 2014] [debug] cache_util.c(604): Cache already locked for
stale cached URL, pretend it is fresh:
/examples/jsp/jsp2/el/basic-arithmetic.jsp
[Wed May 21 03:06:05 2014] [debug] cache_util.c(604): Cache already locked for
stale cached URL, pretend it is fresh:
/examples/jsp/jsp2/el/basic-arithmetic.jsp
[Wed May 21 03:06:05 2014] [debug] cache_util.c(604): Cache already locked for
stale cached URL, pretend it is fresh:
/examples/jsp/jsp2/el/basic-arithmetic.jsp
[Wed May 21 03:06:05 2014] [debug] cache_util.c(604): Cache already locked for
stale cached URL, pretend it is fresh:
/examples/jsp/jsp2/el/basic-arithmetic.jsp
[Wed May 21 03:06:05 2014] [debug] cache_util.c(604): Cache already locked for
stale cached URL, pretend it is fresh:
/examples/jsp/jsp2/el/basic-arithmetic.jsp
[Wed May 21 03:06:05 2014] [debug] cache_util.c(604): Cache already locked for
stale cached URL, pretend it is fresh:
/examples/jsp/jsp2/el/basic-arithmetic.jsp
[Wed May 21 03:06:05 2014] [debug] cache_util.c(604): Cache already locked for
stale cached URL, pretend it is fresh:
/examples/jsp/jsp2/el/basic-arithmetic.jsp
[Wed May 21 03:06:05 2014] [debug] cache_util.c(604): Cache already locked for
stale cached URL, pretend it is fresh:
/examples/jsp/jsp2/el/basic-arithmetic.jsp
[Wed May 21 03:06:05 2014] [debug] cache_util.c(604): Cache already locked for
stale cached URL, pretend it is fresh:
/examples/jsp/jsp2/el/basic-arithmetic.jsp
[Wed May 21 03:06:05 2014] [debug] cache_util.c(604): Cache already locked for
stale cached URL, pretend it is fresh:
/examples/jsp/jsp2/el/basic-arithmetic.jsp
[Wed May 21 03:06:05 2014] [debug] cache_util.c(604): Cache already locked for
stale cached URL, pretend it is fresh:
/examples/jsp/jsp2/el/basic-arithmetic.jsp
[Wed May 21 03:06:05 2014] [debug] cache_util.c(604): Cache already locked for
stale cached URL, pretend it is fresh:
/examples/jsp/jsp2/el/basic-arithmetic.jsp
[Wed May 21 03:06:05 2014] [debug] cache_util.c(604): Cache already locked for
stale cached URL, pretend it is fresh:
/examples/jsp/jsp2/el/basic-arithmetic.jsp
[Wed May 21 03:06:05 2014] [debug] cache_util.c(604): Cache already locked for
stale cached URL, pretend it is fresh:
/examples/jsp/jsp2/el/basic-arithmetic.jsp
[Wed May 21 03:06:05 2014] [debug] mod_cache.c(767): cache: Caching url:
/examples/jsp/jsp2/el/basic-arithmetic.jsp
[Wed May 21 03:06:05 2014] [debug] mod_cache.c(990): cache: proactively
removing the lock #2
[Wed May 21 03:06:05 2014] [debug] cache_util.c(310): Cache lock removed for
stale cached URL, /examples/jsp/jsp2/el/basic-arithmetic.jsp
[Wed May 21 03:06:05 2014] [debug] mod_cache.c(404): cache: proactively
removing the lock #1
[Wed May 21 03:06:05 2014] [debug] mod_cache.c(767): cache: Caching url:
/examples/jsp/jsp2/el/basic-arithmetic.jsp
[Wed May 21 03:06:05 2014] [debug] mod_cache.c(990): cache: proactively
removing the lock #2
[Wed May 21 03:06:05 2014] [debug] cache_util.c(310): Cache lock removed for
stale cached URL, /examples/jsp/jsp2/el/basic-arithmetic.jsp
[Wed May 21 03:06:05 2014] [debug] mod_cache.c(404): cache: proactively
removing the lock #1

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