ShardState

Remarks

Requested → Starting → Ready → Draining → Stopping → Stopped ↓ ↓ ↓ Failed ← Lost ← (missed heartbeats) ⚠ Ready is the only state that is a placement candidate, and that single rule is what makes both elastic scaling and rolling upgrades work with no further mechanism: a shard stops taking arrivals the instant it starts draining, and one that has not finished loading its map never takes any.

Fields and properties (8)

• Requested

  A decision to exist, with no process behind it yet.

• Starting

  The backend created something. It is not a placement candidate.

• Ready

  Connected, map loaded, endpoint reported. The only placeable state.

• Draining

  No new placements; the players already here are moved at safe moments (§ Drain).

• Stopping

  Empty, and shutting down.

• Stopped

  Gone, on purpose.

• Failed

  It never came up.

• Lost

  Three heartbeats missed. Gone, not on purpose, and its volatile state with it — recovery is a placement rather than a resurrection.

Used by (27)

• ClusterSerializationTestsVixen.Live.Cluster.Tests
• FakeShardVixen.Live.Realm.Cluster.Tests
• FleetGrainVixen.Live.Orchestrator
• FleetSimulationVixen.Live.Orchestrator.Tests
• IShardGrainVixen.Live.Cluster
• MapCoordinatorVixen.Live.Orchestrator
• MapCoordinatorTestsVixen.Live.Orchestrator.Tests
• MapFleetVixen.Live.Orchestrator
• MapFleetTestsVixen.Live.Orchestrator.Tests
• MapGrainVixen.Live.Orchestrator
• PlacementDirectorVixen.Live.Orchestrator
• PlacementDirectorTestsVixen.Live.Orchestrator.Tests
• PlacementWeightsTestsVixen.Live.Orchestrator.Tests
• RealmClusterVixen.Live.Realm.Cluster
• RealmClusterTestsVixen.Live.Realm.Cluster.Tests
• RealmHealthVixen.Live.Realm
• RealmHostVixen.Live.Realm
• RealmHostTestsVixen.Live.Realm.Tests
• RolloutVixen.Live.Orchestrator
• RolloutTestsVixen.Live.Orchestrator.Tests
• ShardCandidateVixen.Live.Orchestrator
• ShardGrainVixen.Live.Orchestrator
• ShardLifecycleVixen.Live.Orchestrator
• ShardLifecycleTestsVixen.Live.Orchestrator.Tests
• ShardReportVixen.Live.Cluster
• SimulatedVixen.Live.Orchestrator.Tests
• TransferFleetVixen.Live.Realm.Tests