Session 210 — Memgraph HA Cluster

[superseded: this cluster was decommissioned and deleted 2026-07-10; replaced by orchgraph — see Memgraph HA Cluster Reference. Historical record, left as-is.]

Goals

• Set up Memgraph HA cluster with autofailover/failback.
• Integrate HA controller with semantic_graph adapter.
• Add tests and fix test isolation.

Outcomes

• Created MemgraphHAController + CLI + Incus launcher scripts.
• Deployed 3-node cluster + controller container.
• Verified failover (memgraph-1 → memgraph-2) and failback (memgraph-1 as replica).
• Added tests/semantic_graph/test_memgraph_ha.py.
• Fixed vector index isolation in test fixture.
• Updated .env with MEMGRAPH_HA_CONTROLLER_URL and MEMGRAPH_URIS.

Key Commands

uv run pytest tests/semantic_graph/ -v --timeout=120
./incus/memgraph-cluster-launch.sh
curl http://10.53.1.153:8080/status