[IGNITE-7163] Validate connection from a pre-previous node

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.3
• Fix Version/s: 2.7
• Component/s: general
• Labels: discovery
• Assignee: Dmitry Karachentsev
• Reporter: Alexandr Kuramshin
• Created: 11/Dec/17 12:53
• Updated: 04/Jul/18 16:37
• Resolved: 04/Jul/18 16:37

Description

If some pre-previous node connects to the local node with the previous node in the message's failed nodes collection additional steps should be done:

1. Connection with the previous node should be validated.
2. If a message from the previous node was not received a long time ago, the previous node should be considered as failed and the pre-previous node connection accepted.
3. If the previous node connection is alive then different scenarios possible
   1. Answer with a new result code causing the pre-previous node to try to reconnect to the previous node
   2. Break connection with the pre-previous node causing to continue the possible cluster split.
   3. Check connections with nodes after pre-previous node and delay decision by answering RES_WAIT to get more predictable split and stable topology.