https://issues.apache.org/bugzilla/show_bug.cgi?id=51240
Bug #: 51240
Summary: maxConnections not honors config when
acceptorThreadCount > 1
Product: Tomcat 7
Version: 7.0.14
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Connectors
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
When acceptorThreadCount > 1, maxConnections not honors config, this affects
BIO & NIO connector (others don't know).
---------- test config begin --------
<Executor name="tomcatThreadPool" namePrefix="catalina-exec-"
maxThreads="300" minSpareThreads="4"/>
<Connector port="9993"
protocol="org.apache.coyote.http11.Http11Protocol"
URIEncoding="ISO-8859-1"
enableLookups="false"
acceptorThreadCount="2"
executor="tomcatThreadPool"
acceptCount="1"
maxConnections="1"
/>
<Connector port="9994"
protocol="org.apache.coyote.http11.Http11NioProtocol"
URIEncoding="ISO-8859-1"
enableLookups="false"
acceptorThreadCount="2"
executor="tomcatThreadPool"
acceptCount="1"
maxConnections="1"
/>
---------- test config end ----------
---- Test-1 (acceptorThreadCount="1") --- OK ---
$ ab2 -n 20000 -c 1000 http://localhost:999x/
$ netstat -atn | grep :999x | grep ESTABLISHED
This show range 3-5 connections (acceptable number)
---- Test-2 (acceptorThreadCount="2") --- KO ---
$ ab2 -n 20000 -c 1000 http://localhost:999x/
$ netstat -atn | grep :999x | grep ESTABLISHED
This show +100 connections > "OOPS", too much far
----
Logs show traces like this when socket closes:
----- catalina.out begin -----
May 22, 2011 9:10:51 PM org.apache.tomcat.util.net.AbstractEndpoint
countDownConnection
WARNING: Incorrect connection count, multiple socket.close called on the same
socket.
----- catalina.out end -------
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