# During server selection, clients (drivers or mongos) MUST raise an error if
# maxStalenessSeconds is defined and not -1 and any server's ``maxWireVersion``
# is less than 5 (`SERVER-23893`_).
---
topology_description:
  type: Sharded
  servers:
  - &1
    address: a:27017
    type: Mongos
    avg_rtt_ms: 5
    lastUpdateTime: 0
    maxWireVersion: 5
    lastWrite: {lastWriteDate: {$numberLong: "1"}}
  - &2
    address: b:27017
    type: Mongos
    avg_rtt_ms: 5
    lastUpdateTime: 0
    maxWireVersion: 4  # Incompatible.
    lastWrite: {lastWriteDate: {$numberLong: "1"}}
read_preference:
  mode: Nearest
  maxStalenessSeconds: 120
error: true