lhotari commented on PR #15155:
URL: https://github.com/apache/pulsar/pull/15155#issuecomment-1104116948
I was able to add a unit test
`org.apache.pulsar.broker.admin.AdminApiHealthCheckTest#testHealthCheckupDetectsDeadlock`.
It demonstrates what gets logged when a deadlock is detected.
Here's some of the logging:
```
Found one Java-level deadlock:
=============================
"deadlockthread-1":
waiting for ownable synchronizer 0x00000000d896b550, (a
java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync),
which is held by "deadlockthread-2"
"deadlockthread-2":
waiting for ownable synchronizer 0x00000000d896b4d8, (a
java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync),
which is held by "deadlockthread-1"
Java stack information for the threads listed above:
===================================================
"deadlockthread-1":
at jdk.internal.misc.Unsafe.park([email protected]/Native Method)
- parking to wait for <0x00000000d896b550> (a
java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync)
at
java.util.concurrent.locks.LockSupport.park([email protected]/LockSupport.java:194)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt([email protected]/AbstractQueuedSynchronizer.java:885)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued([email protected]/AbstractQueuedSynchronizer.java:917)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire([email protected]/AbstractQueuedSynchronizer.java:1240)
at
java.util.concurrent.locks.ReentrantReadWriteLock$WriteLock.lock([email protected]/ReentrantReadWriteLock.java:959)
at
org.apache.pulsar.broker.admin.AdminApiHealthCheckTest.deadlock(AdminApiHealthCheckTest.java:133)
at
org.apache.pulsar.broker.admin.AdminApiHealthCheckTest.lambda$testHealthCheckupDetectsDeadlock$4(AdminApiHealthCheckTest.java:109)
at
org.apache.pulsar.broker.admin.AdminApiHealthCheckTest$$Lambda$720/0x00000001008abc40.run(Unknown
Source)
at java.lang.Thread.run([email protected]/Thread.java:829)
"deadlockthread-2":
at jdk.internal.misc.Unsafe.park([email protected]/Native Method)
- parking to wait for <0x00000000d896b4d8> (a
java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync)
at
java.util.concurrent.locks.LockSupport.park([email protected]/LockSupport.java:194)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt([email protected]/AbstractQueuedSynchronizer.java:885)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued([email protected]/AbstractQueuedSynchronizer.java:917)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire([email protected]/AbstractQueuedSynchronizer.java:1240)
at
java.util.concurrent.locks.ReentrantReadWriteLock$WriteLock.lock([email protected]/ReentrantReadWriteLock.java:959)
at
org.apache.pulsar.broker.admin.AdminApiHealthCheckTest.deadlock(AdminApiHealthCheckTest.java:133)
at
org.apache.pulsar.broker.admin.AdminApiHealthCheckTest.lambda$testHealthCheckupDetectsDeadlock$5(AdminApiHealthCheckTest.java:113)
at
org.apache.pulsar.broker.admin.AdminApiHealthCheckTest$$Lambda$721/0x00000001008ab040.run(Unknown
Source)
at java.lang.Thread.run([email protected]/Thread.java:829)
Found 1 deadlock.
```
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