Related: HA and Paxos guides, operations and DR.

Memstore freeze blocks writes when in-memory tablet data exceeds tenant limits before flush to object storage.

Symptoms

  • Write timeouts spike.
  • memstore freeze events in observer logs.
  • OLTP error rate jumps on one tenant only.

Quick checks

SELECT tenant_id, memstore_used, memstore_limit
FROM oceanbase.__all_virtual_tenant_memstore_info;

Prevention

Size memstore_size for peak write burst, not average. Separate bulk tenants from interactive OLTP via resource groups.