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
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