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Additional context "pulsar-timer-66-1" #2504 prio=5 os_prio=0 tid=0x00007ff18c194000 nid=0xaa3 waiting for monitor entry [0x00007ff1cc1e8000] java.lang.Thread.State: BLOCKED (on object monitor) at org.apache.pulsar.client.impl.ProducerImpl.run(ProducerImpl.java:1552) - waiting to lock <0x00000000c8032000> (a org.apache.pulsar.client.impl.ProducerImpl) at io.netty.util.HashedWheelTimer$HashedWheelTimeout.expire(HashedWheelTimer.java:672) at io.netty.util.HashedWheelTimer$HashedWheelBucket.expireTimeouts(HashedWheelTimer.java:747) at io.netty.util.HashedWheelTimer$Worker.run(HashedWheelTimer.java:472) at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) at java.lang.Thread.run(Thread.java:748)
pulsar-timer-66-1" #2504 prio=5 os_prio=0 tid=0x00007ff18c194000 nid=0xaa3 waiting for monitor entry [0x00007ff1cc1e8000] java.lang.Thread.State: BLOCKED (on object monitor) at org.apache.pulsar.client.impl.ProducerImpl.run(ProducerImpl.java:1552) - waiting to lock <0x00000000c8032000> (a org.apache.pulsar.client.impl.ProducerImpl) at io.netty.util.HashedWheelTimer$HashedWheelTimeout.expire(HashedWheelTimer.java:672) at io.netty.util.HashedWheelTimer$HashedWheelBucket.expireTimeouts(HashedWheelTimer.java:747) at io.netty.util.HashedWheelTimer$Worker.run(HashedWheelTimer.java:472) at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) at java.lang.Thread.run(Thread.java:748)
"pulsar-client-io-63-4" #2507 prio=5 os_prio=0 tid=0x00007ff18c0e0000 nid=0xaa2 waiting on condition [0x00007ff1cc2e8000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x00000000c8032140> (a java.util.concurrent.Semaphore$FairSync) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836) at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304) at java.util.concurrent.Semaphore.acquire(Semaphore.java:312) at org.apache.pulsar.client.impl.ProducerImpl.canEnqueueRequest(ProducerImpl.java:766) at org.apache.pulsar.client.impl.ProducerImpl.sendAsync(ProducerImpl.java:377) at org.apache.pulsar.client.impl.ProducerImpl.internalSendAsync(ProducerImpl.java:281) at org.apache.pulsar.client.impl.ProducerBase.sendAsync(ProducerBase.java:76) at com.chinamobile.tuxedo.amqp.store.OpAddMessage.initiate(OpAddMessage.java:129) at com.chinamobile.tuxedo.amqp.store.MessageLogPulsarImpl.updateMessageLogOpened(MessageLogPulsarImpl.java:112) at com.chinamobile.tuxedo.amqp.store.MessageLogPulsarImpl.lambda$openMessageLog$0(MessageLogPulsarImpl.java:93) at com.chinamobile.tuxedo.amqp.store.MessageLogPulsarImpl$$Lambda$743/601077192.accept(Unknown Source) at java.util.concurrent.CompletableFuture.uniAccept(CompletableFuture.java:656) at java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:632) at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474) at java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:1962) at org.apache.pulsar.client.impl.ProducerImpl.lambda$resendMessages$19(ProducerImpl.java:1468) - locked <0x00000000c8032000> (a org.apache.pulsar.client.impl.ProducerImpl) at org.apache.pulsar.client.impl.ProducerImpl$$Lambda$765/1246310252.run(Unknown Source) at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164) at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472) at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:384) at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989) at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
https://blog.fastthread.io/2016/03/07/thread-dump-analysis-pattern-ripple-effect/