Microsoft Azure Essentials Fundamentals of Azure Second Edition e-optimized 5x11 pdf



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9781509302963 Microsoft Azure Essentials Fundamentals of Azure 2nd ed pdf

Azure Service Bus  
Azure Service Bus is a managed service for building reliable and connected applications (either on-
premises or in the cloud) leveraging messaging patterns. Service Bus is often used as a key 
component in eventually consistent solution architectures—providing asynchronous messaging 
integrated with additional Azure resources such as SQL Database, Storage, Web Apps for App Service, 
or applications hosted on Azure Virtual Machines. 
Service Bus features four different communication patterns: 
 
Queues  Provide a basic FIFO (first in, first out) messaging pattern. Messages in a queue are 
stored until they are retrieved and deleted. Service Bus queues are conceptually similar to Azure 
Storage queues, yet they offer a few more advanced middleware capabilities (dead lettering, auto-
forwarding, sessions, duplicate detection, etc.). 
 
Topics  Provide a publish-and-subscribe messaging pattern. A message can be written to a topic, 
and multiple subscriptions can be attached to that topic, with different subscriptions receiving 
different messages depending on a filter. 


 
235 
CHAPTER 9  |    Additional Azure Services 
 
 
Relays  Provide a bidirectional (two-way) communication pattern. Instead of storing messages 
like queues and topics, a relay simply proxies calls from the client/producer to the server/receiver. 
Service Bus Relays is also one of the older services in Azure. It was publicly announced in May 
2006 as Live Labs Relay (since incorporated into the Service Bus family). 
 
Event Hubs  Provide a highly scalable event and telemetry ingestion service for supporting 
scenarios requiring low latency and high reliability. The section below discusses Event Hubs in 
more detail. 

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