On 26/10/2010 13:47, Marc Wilmots wrote: > Hi Experts, > > I have the following setup: > > Apache1 > / \ > Apache2 Apache3 > \ / > Tomcat1
That's an interesting setup. What does it achieve? > All Apaches are version 2.2.3 (RedHat) Time for an upgrade methinks. > Apache2 and Apache3 loadbalance Tomcat1 (6.0.18) with mod_jk (2.2.28). Same again for Tomcat. Presumably you mean 1.2.28 for mod_jk. > In idle state the AJP connector of Tomcat1 only has 7 active connections. > After launching a stress test of Tomcat1, it's AJP connector has reached > maxThreads (200). After the stress test has finished, there are still 200 > active connections in the AJP connector. > > Because of this, apache2 and apache2 cannot receive any heartbeat message > anymore from the AJP connector and mark Tomcat1 as dead. I can access > perfectly through port 8080, so Tomcat1 isn't dead at all! Find and enable the Executor element in server.xml, configure your Connector to reference it. > According to a threaddump, ALL TP-Processor-x threads are in the following > state: > > "TP-Processor41" daemon prio=10 tid=0x8ada7800 nid=0x1496 runnable > [0x861eb000] > java.lang.Thread.State: RUNNABLE > at java.net.SocketInputStream.socketRead0(Native Method) > at java.net.SocketInputStream.read(SocketInputStream.java:129) > at java.io.BufferedInputStream.fill(BufferedInputStream.java:218) > at java.io.BufferedInputStream.read1(BufferedInputStream.java:258) > at java.io.BufferedInputStream.read(BufferedInputStream.java:317) > - locked <0xbab3ef10> (a java.io.BufferedInputStream) > at org.apache.jk.common.ChannelSocket.read(ChannelSocket.java:620) > at > org.apache.jk.common.ChannelSocket.receive(ChannelSocket.java:558) > at > org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:685) > at > org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:889) > at > org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690) > at java.lang.Thread.run(Thread.java:619) > > LambaProbe confirms this and shows 200 AJP connections in KeepAlive state. > > Please see my mod_jk and tomcat ajp connector configurations: > > server.xml: > > <Connector port="9009" protocol="AJP/1.3" redirectPort="8443" > URIEncoding="UTF-8" /> > > workers.properties: > > worker.list=liferay_alf > > worker.alfresco1.port=9009 > worker.alfresco1.host=10.133.23.4 > worker.alfresco1.type=ajp13 > worker.alfresco1.lbfactor=1 > > worker.liferay_alf.type=lb > worker.liferay_alf.balance_workers=alfresco1 > worker.liferay_alf.sticky_session=0 > > > In the Tomcat documentation I've seen that the AJP connector has a property > keepAliveTimeout. Although, before setting this, I would like to know from > you guys whether this looks as apache2 and apache3 continuously keep sending > keepAlive messages to the open AJP connections. If so, why is this? And do > you think setting keepAliveTimeout in Tomcat is the best solution? No, nothing to do with it. See above. p
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