***UNCHECKED*** [jira] [Created] (KAFKA-7421) Deadlock in Kafka Connect

["Maciej Bryński (JIRA)" <ji...@apache.org>]

Maciej Bryński created KAFKA-7421:
-------------------------------------

             Summary: Deadlock in Kafka Connect
                 Key: KAFKA-7421
                 URL: https://issues.apache.org/jira/browse/KAFKA-7421
             Project: Kafka
          Issue Type: Improvement
          Components: KafkaConnect
    Affects Versions: 2.0.0
            Reporter: Maciej Bryński


I'm getting this deadlock on half of Kafka Connect runs.
Thread 1:
{code}
"pool-22-thread-2@4748" prio=5 tid=0x4d nid=NA waiting for monitor entry
  java.lang.Thread.State: BLOCKED
	 waiting for pool-22-thread-1@4747 to release lock on <0x1423> (a org.apache.kafka.connect.runtime.isolation.PluginClassLoader)
	  at org.apache.kafka.connect.runtime.isolation.PluginClassLoader.loadClass(PluginClassLoader.java:91)
	  at org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.loadClass(DelegatingClassLoader.java:367)
	  at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	  at java.lang.Class.forName0(Class.java:-1)
	  at java.lang.Class.forName(Class.java:348)
	  at org.apache.kafka.common.config.ConfigDef.parseType(ConfigDef.java:715)
	  at org.apache.kafka.connect.runtime.ConnectorConfig.enrich(ConnectorConfig.java:295)
	  at org.apache.kafka.connect.runtime.ConnectorConfig.<init>(ConnectorConfig.java:200)
	  at org.apache.kafka.connect.runtime.ConnectorConfig.<init>(ConnectorConfig.java:194)
	  at org.apache.kafka.connect.runtime.Worker.startConnector(Worker.java:233)
	  at org.apache.kafka.connect.runtime.distributed.DistributedHerder.startConnector(DistributedHerder.java:916)
	  at org.apache.kafka.connect.runtime.distributed.DistributedHerder.access$1300(DistributedHerder.java:111)
	  at org.apache.kafka.connect.runtime.distributed.DistributedHerder$15.call(DistributedHerder.java:932)
	  at org.apache.kafka.connect.runtime.distributed.DistributedHerder$15.call(DistributedHerder.java:928)
	  at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	  at java.lang.Thread.run(Thread.java:748)
{code}

Thread 2:
{code}
"pool-22-thread-1@4747" prio=5 tid=0x4c nid=NA waiting for monitor entry
  java.lang.Thread.State: BLOCKED
	 blocks pool-22-thread-2@4748
	 waiting for pool-22-thread-2@4748 to release lock on <0x1421> (a org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader)
	  at java.lang.ClassLoader.loadClass(ClassLoader.java:406)
	  at org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.loadClass(DelegatingClassLoader.java:358)
	  at java.lang.ClassLoader.loadClass(ClassLoader.java:411)
	  - locked <0x1424> (a java.lang.Object)
	  at org.apache.kafka.connect.runtime.isolation.PluginClassLoader.loadClass(PluginClassLoader.java:104)
	  - locked <0x1423> (a org.apache.kafka.connect.runtime.isolation.PluginClassLoader)
	  at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	  at io.debezium.transforms.ByLogicalTableRouter.<clinit>(ByLogicalTableRouter.java:57)
	  at java.lang.Class.forName0(Class.java:-1)
	  at java.lang.Class.forName(Class.java:348)
	  at org.apache.kafka.common.config.ConfigDef.parseType(ConfigDef.java:715)
	  at org.apache.kafka.connect.runtime.ConnectorConfig.enrich(ConnectorConfig.java:295)
	  at org.apache.kafka.connect.runtime.ConnectorConfig.<init>(ConnectorConfig.java:200)
	  at org.apache.kafka.connect.runtime.ConnectorConfig.<init>(ConnectorConfig.java:194)
	  at org.apache.kafka.connect.runtime.Worker.startConnector(Worker.java:233)
	  at org.apache.kafka.connect.runtime.distributed.DistributedHerder.startConnector(DistributedHerder.java:916)
	  at org.apache.kafka.connect.runtime.distributed.DistributedHerder.access$1300(DistributedHerder.java:111)
	  at org.apache.kafka.connect.runtime.distributed.DistributedHerder$15.call(DistributedHerder.java:932)
	  at org.apache.kafka.connect.runtime.distributed.DistributedHerder$15.call(DistributedHerder.java:928)
	  at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	  at java.lang.Thread.run(Thread.java:748)
{code}

I'm using official Confluent Docker images.



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