https://azure.microsoft.com/en-us/documentation/articles/cloud-services-how-to-scale/
But how can I scale up my microservice when queue length increases. have any inbuild way in azure service fabric ?
At this time service fabric does not support autoscale, it will in the near future:
service-fabric-cluster-scale-up-down
Auto-scale Service Fabric clusters
At this time, Service Fabric clusters do not support auto-scaling. In the near future, clusters will be built on top of virtual machine scale sets, at which time auto-scaling will become possible and will behave similarly to the auto-scale behavior available in cloud services.