[IGNITE-23457] Sql. Coordinator failed to send close message after query cancellation

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 3.0.0-beta1
• Component/s: sql
• Labels: ignite-3
• Epic Link: Processing sql on unstable topology
• Assignee: Unassigned
• Reporter: Evgeny Stanilovsky
• Created: 16/Oct/24 06:58
• Updated: 16/Oct/24 06:58

Description

Case: Query was canceled (for some reason, execution timeout or client side action) but coordinator failed with sending close message . Need to handle such a case and just ignore, no recovery actions are needed here, no errors on client side.

Let`s explain we have a long running query and for some reasons cancel is triggered, directly after two things are happen: 1. coordinator start to send close message into working nodes 2. one or more nodes become unavailable. On the basis of our assumptions - NodeLeft event need to be raised but it also can be raised after message service error. All such cases need to be handled correctly.