# `Slap.Cluster.Strategy.Static`
[🔗](https://github.com/mjrusso/slap/blob/slap_cluster-v0.4.0/slap_cluster/lib/slap/cluster/strategy/static.ex#L1)

A fixed assignment of shards to nodes, from configuration: no database,
no leases, no failover. A node opens its own shards (and reopens them
after a backoff if they fail, like `Slap.Cluster.Strategy.Local`), and
routes to the others by the assignment. If a node is down, its shards are
unavailable until it is back.

It suits a Kubernetes StatefulSet (stable names, the platform restarts a
failed pod) or any small fixed cluster. Changing the assignment moves
shards; do it with the nodes stopped, or accept that two nodes may open a
shard for a moment (SlateDB fences one of them).

## Options (one of)

  * `:nodes` - an ordered list of node names; shard `n` belongs to
    `Enum.at(nodes, rem(n, length(nodes)))`. For a StatefulSet:
    `nodes: for i <- 0..2, do: :"app@app-#{i}.app-headless.ns.svc"`.
  * `:assignments` - `%{node => [shard | Range.t()]}`, which must cover
    every shard exactly once.

Plus `Local`'s `:backoff_base`, `:backoff_max` and `:max_concurrency`.
Routing goes over distributed Erlang, so the nodes must be connected.

---

*Consult [api-reference.md](api-reference.md) for complete listing*