[IGNITE-23449] Add support of the new flag HA in zone description

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0
• Labels: ignite-3
• Epic Link: Partition Majority Unavailability
• Ignite Flags: Docs Required, Release Notes Required
• Assignee: Kirill Sizov
• Reporter: Mirza Aliev
• Created: 15/Oct/24 12:36
• Updated: 07/Nov/24 08:08
• Resolved: 07/Nov/24 08:08

Description

Motivation

In IEP-131 we introduce
new field in zone descriptor called consistencyMode.

     /**
     * Specifies the consistency mode of the zone, determining how the system balances data consistency and availability.
     *
     * <p>
     * Possible values are:
     * <ul>
     *   <li><b>STRONG_CONSISTENCY</b>: Ensures strong consistency by requiring a majority of nodes for operations.
     *       Partitions become unavailable if the majority of assigned nodes are lost.</li>
     *   <li><b>HIGH_AVAILABILITY</b>: Prioritizes availability over strict consistency, allowing partitions to remain
     *       available for read-write operations even when the majority of assigned nodes are offline. The system
     *       reconfigures the RAFT group to include only the available nodes without changing the assignments.</li>
     * </ul>
     * </p>
     */
    private final ConsistencyMode consistencyMode;

STRONG_CONSISTENCY is the current behaviour of zones/partitions in AI3.

We must forbid to change this flag, so it must be immutable and must be configured only on a zone creation.
It must be possible to set this filed through the SQL

CREATE ZONE IF NOT EXISTS exampleZone WITH CONSISTENCY_MODE='HIGH_AVAILABILITY'

Implementation notes

DdlSqlToCommandConverter must be expanded with CONSISTENCY_MODE option along with IgniteCatalogSqlImpl.

Definition of Done

• New field in zone descriptor called consistencyMode is introduced.
• It must be STRONG_CONSISTENCY or HIGH_AVAILABILITY
• This field must be immutable and it must be possible set it only on a zone creation.

Issue Links

• links to: GitHub Pull Request #4667