Hi,
We have one apache and two tomcats running on separate machines in
production. There is a firewall between apache and tomcat servers. Sticky
session is enabled for load balancing. Load balancing between these tomcat is
happening properly, however fail-over has problem.
When we shutdown one tomcat, the other tomcat was getting hung with in two
minutes. The number of users on tomcat1 were around 400 and almost equal number
of users on tomcat2 (load was around 700 requests per min). When we took thread
dump of second tomcat, all AJP connectors threads (around 650) were stuck with
the following stack trace. Could you help me to solve this problem? Do you
think "connectionTimeout=-1" in server.xml causing this problem?
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:129)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:183)
at java.io.BufferedInputStream.read1(BufferedInputStream.java:222)
at java.io.BufferedInputStream.read(BufferedInputStream.java:277)
- locked <0x7e19ebe8> (a java.io.BufferedInputStream)
at org.apache.jk.common.ChannelSocket.read(ChannelSocket.java:601)
at
org.apache.jk.common.ChannelSocket.receive(ChannelSocket.java:538)
at
org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:666)
at
org.apache.jk.common.SocketConnection.runIt(ChannelSocket.java:871)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:534)
Setup:
OS - SolarisOS,
Apache/1.3.33 (Unix) mod_ssl/2.8.22 OpenSSL/0.9.7e
mod_jk - 1.2.14
jdk - 1.4.2_03
Tomcat - 5.5.8
workers.properties:
---------------------------
workers.tomcat_home=/opt/tomcat
ps=/
worker.list=tomcat1, tomcat2, loadbalancer, jkstatus
worker.tomcat1.port=8099
worker.tomcat1.host=xxxx
worker.tomcat1.type=ajp13
worker.tomcat1.lbfactor=1
worker.tomcat1.socket_keepalive=1
worker.tomcat1.socket_timeout=15
worker.tomcat1.recycle_timeout=60
worker.tomcat1.retries=3
worker.tomcat2.port=9009
worker.tomcat2.host=yyyy
worker.tomcat2.type=ajp13
worker.tomcat2.lbfactor=1
worker.tomcat2.socket_keepalive=1
worker.tomcat2.socket_timeout=15
worker.tomcat2.recycle_timeout=60
worker.tomcat2.retries=3
worker.loadbalancer.type=lb
worker.loadbalancer.balanced_workers=tomcat1, tomcat2
worker.loadbalancer.sticky_session=true
worker.jkstatus.type=status
server.xml
--------------
<Connector port="8099" enableLookups="false" protocol="AJP/1.3"
minSpareThreads="100" maxThreads="700" maxSpareThreads="80"
acceptCount="60" debug="0"
connectionTimeout="-1" request.registerRequests="false" />
Thanks,
-Sreedhar
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