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Diffstat (limited to 'doc/service_config.md')
| -rw-r--r-- | doc/service_config.md | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/doc/service_config.md b/doc/service_config.md index ecc23817d1..c5d4ef42b1 100644 --- a/doc/service_config.md +++ b/doc/service_config.md @@ -13,12 +13,20 @@ The service config is a JSON string of the following form: ``` { // Load balancing policy name. - // Supported values are 'round_robin' and 'grpclb'. - // Optional; if unset, the default behavior is pick the first available - // backend. - // Note that if the resolver returns only balancer addresses and no - // backend addresses, gRPC will always use the 'grpclb' policy, - // regardless of what this field is set to. + // Currently, the only selectable client-side policy provided with gRPC + // is 'round_robin', but third parties may add their own policies. + // This field is optional; if unset, the default behavior is to pick + // the first available backend. + // If the policy name is set via the client API, that value overrides + // the value specified here. + // + // Note that if the resolver returns at least one balancer address (as + // opposed to backend addresses), gRPC will use grpclb (see + // https://github.com/grpc/grpc/blob/master/doc/load-balancing.md), + // regardless of what LB policy is requested either here or via the + // client API. However, if the resolver returns backend addresses as + // well as balancer addresses, the client may fall back to the requested + // policy if it is unable to reach any of the grpclb load balancers. 'loadBalancingPolicy': string, // Per-method configuration. Optional. |