[GitHub] carryxyh edited a comment on issue #2539: When adding @Referenc in Multicast registry, deadlock happened.

[GitBox <gi...@apache.org>]

carryxyh edited a comment on issue #2539: When adding @Referenc in Multicast registry, deadlock happened.
URL: https://github.com/apache/incubator-dubbo/issues/2539#issuecomment-423105964
 
 
   The log is already obvious.
   When the main thread initializes the spring container, it locks org.springframework.beans.factory.support.DefaultSingletonBeanRegistry#singletonObjects and then tries to lock a RegistryDirectory when executing MulticastRegistry.doSubscribe.
   
   The DubboMulticastRegistryReceiver thread locks the RegistryDirectory when it is in MulticastRegistry.receive. When it gets the bean, it tries to lock org.springframework.beans.factory.support.DefaultSingletonBeanRegistry#singletonObjects and deadlock.
   
   So it seems that we need to synchronize the execution of MulticastRegistry.this.receive in the MulticastRegistry contructor to eliminate deadlock.

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