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Large number of threads/connections marked "keep alive"
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created by <a href="http://community.jboss.org/people/benhsu_at_bluefly">Ben Hsu</a> in <i>Performance Tuning</i> - <a href="http://community.jboss.org/message/587341#587341">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hello</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>We're seeing an issue where the performance of our application would degrade over time, to the point where its unresponsive. Based on what I see, I think it might be related to how we're configuring keep-alive, and I'm wondering where I can find more information about configuring keep-alive in JBoss.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The symptoms:</p><p> - The application's performance would degrade over the day </p><p>- eventually we will get a message saying "all 200 threads are busy, please increase the maximum thread count"</p><p> - at this point, doing a thread dump (using "kill -3") shows many threads in the following state:</p><p><blockquote></p><p>"TP-Processor200" daemon prio=1 tid=0x0000002b31e372c0 nid=0x651a runnable [0x000000005408e000..0x000000005408ec30]</p><p>          at java.net.SocketInputStream.socketRead0(Native Method)</p><p>          at java.net.SocketInputStream.read(SocketInputStream.java:129)</p><p>          at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)</p><p>          at java.io.BufferedInputStream.read1(BufferedInputStream.java:256)</p><p>          at java.io.BufferedInputStream.read(BufferedInputStream.java:313)</p><p>          - locked <0x0000002b082abec0> (a java.io.BufferedInputStream)</p><p>          at org.apache.jk.common.ChannelSocket.read(ChannelSocket.java:620)</p><p>          at org.apache.jk.common.ChannelSocket.receive(ChannelSocket.java:558)</p><p>          at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:685)</p><p>          at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:889)</p><p>          at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)</p><p>          at java.lang.Thread.run(Thread.java:595)</p><p></blockquote></p><p> - when I look at the "connection scoreboard" in the JBoss web console, I see 200 connections marked with a "K" for "keep alive", also these connections look like they've been around for a long time (around 7,000,000ms, which will be 2 hours), long after we've killed all the clientsd</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Based on what I saw above and some googling, I'm thinking this might be related to how we're configuring keep alive. I haven't been able to go further than this, because I don't know much about JBoss configuration. Does anybody have any information about how keep alive is being configured in JBoss?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>We are using JBoss version 4.0.5 GA</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thank you!</p></div>
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