We use zookeeper 3.4.6
Our webapp running in a tomcat server suffered a condition where user
sessions seemed to "freeze". We got a single thread dump at that time. I
am curious about a particular stacktrace that is seen in the thread
dump, related to zookeeper.
Does the following stacktrace cause any alarm or concern? Thanks!
"ajp-bio-8012-exec-561-EventThread" daemon prio=3 tid=0x0000000105a46000
nid=0x11fa waiting on condition [0xfffffffd967ff000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0xffffffff11fd9110> (a
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at
java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043)
at
java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
at
org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:494)
