https://issues.apache.org/bugzilla/show_bug.cgi?id=54036
Priority: P2
Bug ID: 54036
Assignee: dev@tomcat.apache.org
Summary: currentThreadsBusy issue in centos 6
Severity: critical
Classification: Unclassified
OS: Linux
Reporter: vigo...@gmail.com
Hardware: PC
Status: NEW
Version: 7.0.32
Component: Connectors
Product: Tomcat 7
Hi, since when centos 6 went out I've tryed to switch some of my server from
centos 5.x to 6.x I currently own 13 servers with tomcat installed ,
thse servers have a very high load, and contain only 1 servlet never
reloaded/unloaded which print out static content (no cookie/session) i use the
compiled JNI (with apr ) , initially everythin was 1 servlet inside tomcat, now
i have directly embedded tomcat into the servlet,
the issue is:
when i have tomcat (jdk from 1.6.x to 1.7.x doesn't change) and the load
become a bit intense (about 600 req/sec ) the currentThreadsBusy become very
high till maxes out (220 currentThreadsBusy) and stay at that value, seems that
threads have some issue in closing ( i've inserted an atomic timer in servlets
to monitor if these remains up, and cuncurrent executions calculated by this
timer remain between 1 or 2 !!) and that's right because cpu usage is at 0.3%!
same identical configuration in a server with centos 5.x run fine with about 15
threads busy serving about 8k requests/second with cpu usage of about 35% (even
if cuncurrent servlet in execution are usually 1 or 2 here too), seems that
tomcat have some issue detaching the thread, i supposed that was my fault of
some configuration (even if i'm not so dumb on that ) the ni found that this
guy have the same problem :
http://efreedom.com/Question/1-7296648/Tomcat-Centos-CurrentThreadsBusy-Issue
no one seems to have a solution, initially i thought that was because centos 6
was pretty recent so maybe the issue would be fixed in earlyer releases of
tomcat, but we are at 7.0.32 and the problem persist..
when i have time i want to try to help in developement of tomcat (i'm learning
a bit of his internal syntax while working on it.. ) but at this moment i
don't even have time to sleep.. nor to provide some easily reproducible test
case , also because this need a bit of load from different sources, but if you
have suggestions i can try to implements and let you know if works , best i can
do now is to attach thread dump of the current bugged execution (with all
threads stuck here
at org.apache.tomcat.jni.Socket.recvbb(Native Method)
at
org.apache.coyote.http11.InternalAprInputBuffer.fill(InternalAprInputBuffer.java:575)
at
org.apache.coyote.http11.InternalAprInputBuffer.parseRequestLine(InternalAprInputBuffer.java:134)
please let me know.. at this moment i'm again going to reinstall centos 5.x on
that server and give up, because i need this server up and working today..
but anyway this issues must be fixed.
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