[IGNITE-18755] Empty data nodes list of a distribution zone.

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Labels: dzm-reviewed ignite-3 tech-debt
• Assignee: Sergey Uttsel
• Reporter: Sergey Uttsel
• Created: 08/Feb/23 07:05
• Updated: 17/Oct/23 10:15
• Resolved: 17/Oct/23 10:15

Description

Motivation

In some cases list of data nodes for the distribution zone can be empty. For example when scale down timer is expired and removed all data nodes. It can leads to the data loss.

We need a proper solution to this problem as part of the improvement of the rebalance. But for now, we need to make a temp solution to this problem and not change the list of data nodes if this will lead to the empty list.

Definition of Done

DistributionZoneManager doesn't save the list of data nodes to meta storage if it is empty.

Issue Links

• is a child of: IGNITE-17924 Core distributions zones functionality.
• is blocked by: IGNITE-19061 Node restart rewrites data nodes with too actual nodes (Design ticket)
• links to: GitHub Pull Request #1986