1. Reliable Services
Jeffrey Richter
Microsoft Azure
Service Fabric

2. Reliable Services (Stateless & Stateful)
.NET Programming model benefits
Networking naming service support
Self-reporting of instance’s load metrics
Integrate with code, config, & data upgrades
Efficiency (better density): Multiple services (types & instances) in a single process
Other programming models can be built on Service Fabric
Example: Reliable Actors

3. Reliable Services Your class object is notified of service start/stop
Similar to Azure Cloud Services’ RoleEntryPoint
Your class object does whatever you need it to do
Ex: Process network requests or queue messages
Stateless services keep their state in an external store
Ex: Azure Storage, SQL Database, Document DB, etc.
Partition your data so it scales well

4. Creating a Stateless Reliable Service Visual Studio Solution

5. Steps to have your Service Listen
For input endpoint(s), configure load balancer to allow traffic over desired port(s)
Add endpoint(s) to ServiceManifest.xml (for ACL’ing)
When service starts, listen for network traffic
Override CreateServiceInstanceListeners
Return method(s) that create listener objects/endpoint names
When service instance starts, SF invokes method(s) to create listener object(s)
Each listener object starts listening (tcp, http) & returns endpoint to SF
SF runtime sends all names/endpoints to SF naming service
Endpoints are visible in Service Fabric Explorer

6. Steps to have Client Talk to Service
Client queries naming service
Pass service/partition key; returns endpoint
Client communicates with endpoint
If service moves; communication fails. Re-query naming service.
Ways to query naming service
ResolvePartition (REST)
Resolve-ServiceFabricService (PowerShell)
ServicePartitionResolver (.NET)
See also ServicePartitionClient which adds retry support

7. Recommended HTTP Endpoint String Format
$"http(s)://{nodeNameorIP}:{port}/" +
$"{partitionId}/{instanceId}/{Guid.NewGuid()}/"
Example:
99ab0795-c10f e d8f9732/ / dc09a30c-9b7f b7-e b/
For diagnostics
Makes every endpoint unique

8. Upgrading a Named Application with Visual Studio

9. Q & A