ClusterRepoItemEvent causes exceptions (#956)

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Andrzej Wójcik (Tigase) opened 6 years ago

Following exception is being thrown when one of the cluster nodes fires ClusterRepoItemEvent:

2018-06-17 13:42:26.768 [in_0-eventbus]    StanzaProcessor.processPacket()         SEVERE:   Unsupported conversion to class tigase.cluster.repo.ClusterRepoItem when processing from=eventbus@ip-10-0-33-215.us-west-2.compute.internal, to=eventbus@ip-10-0-21-93.us-west-2.compute.internal, DATA=<message xmlns="jabber:client" id="ip-10-0-33-215.us-west-2.compute.internal-4" from="eventbus@ip-10-0-33-215.us-west-2.compute.internal" to="eventbus@ip-10-0-21-93.us-west-2.compute.internal"><event xmlns="http://jabber.org/protocol/pubsub#event"><items node="tigase.cluster.repo.ClusterRepoItemEvent"><item><tigase.cluster.repo.ClusterRepoItemEvent><action>UPDATED</action><item>ip-10-0-21-93.us-west-2.compute.internal:1bec8aab36d1f381630583fd310ac2b02527b455b5eeeea11e129fce8ee29c31:5277:1529242943923:99.99:36.972363:ec2-34-215-29-103.us-west-2.compute.amazonaws.com</item></tigase.cluster.repo.ClusterRepoItemEvent></item></items></event></message>, SIZE=654, XMLNS=jabber:client, PRIORITY=NORMAL, PERMISSION=ADMIN, TYPE=null
java.lang.RuntimeException: Unsupported conversion to class tigase.cluster.repo.ClusterRepoItem
	at tigase.kernel.DefaultTypesConverter.convert(DefaultTypesConverter.java:325)
	at tigase.eventbus.impl.EventBusSerializer.deserialize(EventBusSerializer.java:72)
	at tigase.eventbus.component.EventReceiverModule.fireEventLocally(EventReceiverModule.java:130)
	at tigase.eventbus.component.EventReceiverModule.process(EventReceiverModule.java:111)
	at tigase.component.modules.StanzaProcessor.process(StanzaProcessor.java:167)
	at tigase.component.modules.StanzaProcessor.processPacket(StanzaProcessor.java:88)
	at tigase.component.AbstractKernelBasedComponent.processPacket(AbstractKernelBasedComponent.java:84)
	at tigase.eventbus.component.EventBusComponent.processPacket(EventBusComponent.java:96)
	at tigase.server.AbstractMessageReceiver$QueueListener.run(AbstractMessageReceiver.java:1367)

Andrzej Wójcik (Tigase) commented 6 years ago

This event was implementing Serializable which forced it to be executed in the cluster scope. Due to that it (and its properties) where serialized on the cluster node which fired this event and then deserialization was happening on the other cluster nodes. Unfortunately, for this to work, all types/classes of event fields need to be either serializable/deserializable or marked as transientbut it was not true for ClusterRepoItem.

As this event is fired on each cluster node when new nodes is found in the cluster nodes repository, there is no point to fire it in the cluster scope. Instead it should be fired in the local node scope (no serizalization needed) and it will be fired on every cluster node as each cluster node will detect change in the list of cluster nodes and will fire it on its own.

Due to that, I've changed this scope to local (removed implements Serializable and empty constructor).

Type	Bug
Priority	Normal
Assignee	wojciech.kapcia@tigase.net
RedmineID	7747
Version	tigase-server-8.0.0
Spent time	5h

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Reference

tigase/_server/server-core#956