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Issue #53: Add a Readiness check as a mirror to Health to support differentiated… #54

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Issue #53: Add a Readiness check as a mirror to Health to support differentiated… #54

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23 changes: 23 additions & 0 deletions grpc/health/v1/health.proto
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Original file line number Diff line number Diff line change
Expand Up @@ -61,3 +61,26 @@ service Health {
// clients should retry the call with appropriate exponential backoff.
rpc Watch(HealthCheckRequest) returns (stream HealthCheckResponse);
}

service Readiness {
// If the requested service is unknown, the call will fail with status
// NOT_FOUND.
rpc Check(HealthCheckRequest) returns (HealthCheckResponse);

// Performs a watch for the readiness status of the requested service.
// The server will immediately send back a message indicating the current
// readiness status. It will then subsequently send a new message
// whenever the service's serving status changes.
//
// If the requested service is unknown when the call is received, the
// server will send a message setting the serving status to
// SERVICE_UNKNOWN but will *not* terminate the call. If at some
// future point, the serving status of the service becomes known, the
// server will send a new message with the service's serving status.
//
// If the call terminates with status UNIMPLEMENTED, then clients
// should assume this method is not supported and should not retry the
// call. If the call terminates with any other status (including OK),
// clients should retry the call with appropriate exponential backoff.
rpc Watch(HealthCheckRequest) returns (stream HealthCheckResponse);
}