Tomcat7 Java1.7_025
On 21 October 2014 20:06, Smith, Mitchell <mitchell.sm...@cwc.com> wrote: > Hi > > I have an issue where my applicaion servers have recently started failing > with OOM - cannot create native thread errors. However the dump files all > show he majority of threads (over 90%) like the following: > > "pool-21088-thread-1" - Thread t@36407 >> >> java.lang.Thread.State: WAITING >> at sun.misc.Unsafe.park(Native Method) >> - parking to wait for <2bc1d4f0> (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.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1079) >> at >> java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:807) >> at >> java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1068) >> at >> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) >> at >> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) >> at java.lang.Thread.run(Thread.java:724) >> Locked ownable synchronizers: >> - None >> >> >> > My first assumption is that these are for a connection pool, however I am > seeing close to 1000 (one thousand) and these never appear to timeout, or > close. > > > I could of course increase the number of threads the OS allows, but this > of course has memory implications etc and is not really solving the root > cause. > > Can anyone identify what these are? I see some posts online indicating > these are the connection pool waiting for new requests. But this doesnt > seem to match my configuation for acceptable connections > > Any help would be greatly appreciated > > Thanks > > *Mitchell * > > Cable & Wireless Communications Plc is a company registered in England & Wales with number: 07130199 and offices located at 3rd Floor, 26 Red Lion Square, London WC1R 4HQ
