[IGNITE-14762] Leader refresh sometimes blocks indefinitely

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Fix Version/s: 3.0.0-alpha2
• Labels: ignite-3 networking
• Ignite Flags: Docs Required, Release Notes Required
• Assignee: Aleksandr Polovtsev
• Reporter: Aleksandr Polovtsev
• Reviewer: Semyon Danilov
• Created: 21/May/21 13:36
• Updated: 23/May/21 19:14
• Resolved: 21/May/21 17:20

Description

RaftGroupServiceImpl#refreshLeader sometimes blocks when sending a request from a node to itself.

Probable cause

We suspect that DelegatingTransportFactory#requestResponseToSelf contains a race condition: Flux returned by the listen() method might be lazily evaluated, in which case the client will start listening for messages after the message event handlers have already been executed, so no new incoming messages will actually be detected.

Issue Links

• links to: GitHub Pull Request #143