https://bz.apache.org/bugzilla/show_bug.cgi?id=69539
Bug ID: 69539
Summary: Zero content length can be return with many concurrent
requests
Product: Tomcat 11
Version: unspecified
Hardware: PC
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
Assignee: dev@tomcat.apache.org
Reporter: richard.ev...@blueallegro.net
Target Milestone: -------
Created attachment 39970
--> https://bz.apache.org/bugzilla/attachment.cgi?id=39970&action=edit
test case submitting multiple requests to fill cache
Send many (over 100) concurrent GET requests for different resources which are
sized just below cacheObjectMaxSize.
The requests all succeed with status 200 but a number return with
content-length: 0
in the response. A wild guess is that the cache is full with objects being
used to service requests and a new request can therefore not fit in the cache.
If caching is disabled or the cache size increased, the problem goes away.
Observed with Tomcat 11.0.2 and 10.1.34 on Windows 11.
Reproduce by making a test war file with commands like:
dd if=/dev/random of=r1 bs=1024 count=500
mkdir test
cd test
(x=1; while [ $x -le 120 ]; do cp ../r1 data$x.bin; x=$(expr $x + 1); done)
zip -r ../test.war .
This will make a war file with data1.bin to data120.bin
Deploy the war file to tomcat on Windows and then run the attached client code
with URL (for example http://localhost:8080/test) as argument.
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