» Service Splitter

The service-splitter config entry kind controls how to split incoming Connect requests across different subsets of a single service (like during staged canary rollouts), or perhaps across different services (like during a v2 rewrite or other type of codebase migration).

If no splitter config is defined for a service it is assumed 100% of traffic flows to a service with the same name and discovery continues on to the resolution stage.

» Interaction with other Config Entries

  • Service splitter config entries are a component of L7 Traffic Management.

  • Service splitter config entries are restricted to only services that define their protocol as http-based via a corresponding service-defaults config entry or globally via proxy-defaults .

  • Any split destination that specifies a different Service field and omits the ServiceSubset field is eligible for further splitting should a splitter be configured for that other service, otherwise resolution proceeds according to any configured service-resolver.

» Sample Config Entries

Split traffic between two subsets of the same service:

kind = "service-splitter"
name = "web"
splits = [
  {
    weight         = 90
    service_subset = "v1"
  },
  {
    weight         = 10
    service_subset = "v2"
  },
]

Split traffic between two services:

kind = "service-splitter"
name = "web"
splits = [
  {
    weight = 50
    # will default to service with same name as config entry ("web")
  },
  {
    weight  = 10
    service = "web-rewrite"
  },
]

» Available Fields

  • Kind - Must be set to service-splitter

  • Name (string: <required>) - Set to the name of the service being configured.

  • Splits (array<ServiceSplit>) - Defines how much traffic to send to which set of service instances during a traffic split. The sum of weights across all splits must add up to 100.

    • Weight (float32: 0) - A value between 0 and 100 reflecting what portion of traffic should be directed to this split. The smallest representable weight is 1/10000 or .01%
    • Service (string: "") - The service to resolve instead of the default.
    • ServiceSubset (string: "") - A named subset of the given service to resolve instead of one defined as that service's DefaultSubset. If empty the default subset is used.
    • Namespace (string: "") - The namespace to resolve the service from instead of the current namespace. If empty the current namespace is assumed.

» ACLs

Configuration entries may be protected by ACLs.

Reading a service-splitter config entry requires service:read on itself.

Creating, updating, or deleting a service-splitter config entry requires service:write on itself and service:read on any other service referenced by name in these fields: