[GEODE-7038] After auto-reconnect a server's multicat communications aren't working correctly

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.11.0
• Component/s: membership, messaging
• Assignee: Bruce J Schuchardt
• Reporter: Bruce J Schuchardt
• Created: 31/Jul/19 20:44
• Updated: 30/Dec/19 18:50
• Resolved: 02/Aug/19 18:14

Description

This was observed in an server having multicast enabled on a Region.  The server went into a GC pause and was kicked out of the cluster.  After auto-reconnecting all of the servers were requested to shut down and they all hung on destroy-region message responses.  Statistics showed constant multicast retransmission requests but no retransmissions being sent.

When a Region is configured to use multicast all of its cache operation messages are multicast, including a destroy-region message.

Some time ago we decided to stop sending Join Request Responses during discovery.  These messages were responsible for carrying the JGroups multicast message digest so that a joining member could install this digest into its multicast protocol.  Today these messages are only sent if a UDP Diffie-Hellman algorithm has been specified.  We need to also ensure that we send these messages if multicast is enabled.

 

Issue Links

• links to: GitHub Pull Request #3871