emqx4.3/changes/ce/fix-10976.en.md

Fix topic-filter overlapping handling in shared subscription. In the previous implementation, the storage method for subscription options did not provide adequate support for shared subscriptions. This resulted in message routing failures and leakage of routing tables between nodes during the "subscribe-unsubscribe" process with specific order and topics.

Breaking changes

• Hook callback session.subscribed and client.subscribe will now receive shared subscription in its full representation, e.g. $share/group1/topic1/#, and the share property is deleted from subopts.
• Hook callback session.unsubscribed and client.unsubscribe will now receive shared subscription in its full representation, e.g. $share/group1/topic1/# instead of just topic1/#.
• ExHook Proto changed. The share field in message SubOpts was deprecated. ExHook Server will now receive shared subscription in its full representation, e.g. $share/group1/topic1/#, and the share property is deleted from message SubOpts.
• session.subscribed and session.unsubscribed rule-engine events will have shared subscriptions in their full representation for topic, e.g. $share/group1/topic1/# instead of just topic1/#.