Moved from Tomcat 7.0.55 to Tomcat 8.0.23 and now see the AJP Poller thread churning through a lot of CPU in a pretty much quiet system.
This seems like a bug. * Restarting does not resolve the issue * I've seen some mention of bumping up the memory. Doubling the max heap (-Xmx from 506m to 1012m) does not help. This is a relatively small service that is essentially idle - or at least it would be with the exception of this Poller thread. The connector configuration is unchanged. <Connector port="28080" protocol="AJP/1.3" secure="true" scheme="https" connectionTimeout="20000" packetSize="20000" maxThreads="1024" URIEncoding="UTF-8" redirectPort="443" useSendfile="false" compression="force" compressableMimeTypes="text/html,text/xml,text/plain,text/javascript,text/css,application/json,application/xml" /> The thread consuming all the CPU "ajp-apr-28080-Poller" #62 daemon prio=5 os_prio=0 tid=0x00002ba40293e000 nid=0x407d waiting on condition [0x00002ba3fc200000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x00000000eaf94570> (a java.util.concurrent.locks.ReentrantLock$NonfairSync) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:870) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1199) at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:209) at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:285) at java.util.concurrent.LinkedBlockingQueue.signalNotEmpty(LinkedBlockingQueue.java:172) at java.util.concurrent.LinkedBlockingQueue.offer(LinkedBlockingQueue.java:430) at org.apache.tomcat.util.threads.TaskQueue.offer(TaskQueue.java:74) at org.apache.tomcat.util.threads.TaskQueue.offer(TaskQueue.java:31) at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1361) at org.apache.tomcat.util.threads.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:161) at org.apache.tomcat.util.threads.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:141) at org.apache.tomcat.util.net.AprEndpoint.processSocket(AprEndpoint.java:896) at org.apache.tomcat.util.net.AprEndpoint$Poller.run(AprEndpoint.java:1883) at java.lang.Thread.run(Thread.java:745) # rpm -qa | grep apr apr-1.5.1-1 apr-util-1.5.3-1 # rpm -qa | grep http httpd-2.2.27-1 Server version: Apache Tomcat/8.0.23 Server built: May 19 2015 14:58:38 UTC Server number: 8.0.23.0 OS Name: Linux OS Version: 2.6.18-371.el5 Architecture: amd64 JVM Version: 1.8.0_40-b25 JVM Vendor: Oracle Corporation --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org