[GEODE-6842] Possible ClassCastException in HAEventWrapper during concurrent client registration and queue GII

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.10.0
• Fix Version/s: 1.10.0
• Component/s: client queues, client/server
• Assignee: Ryan McMahon
• Reporter: Ryan McMahon
• Created: 06/Jun/19 20:00
• Updated: 07/Jun/19 00:34
• Resolved: 07/Jun/19 00:34

Description

It is possible for a ClassCastException to be thrown if a client is registering interest/CQ concurrently while a queue GII is being performed.  The issue is that the queued event (HAEventWrapper) can be mutated by the client registration logic while it is in another client's queue, so if a GII occurs it could be serialized while being mutated.  Specifically, the CqNameToOpHashMap was shown to throw the exception on the deserialization side, because of a map size/entries mismatch on the serialization side caused by the race described above.

Issue Links

• links to: GitHub Pull Request #3680