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- The Spring Cloud Azure Event Hubs Starter module imports the Event Hubs Java client library with the Spring Boot framework. You can use Spring Cloud Azure and the Azure SDK together, in a non-mutually exclusive pattern. Thus, you can continue using the Event Hubs Java client API in your Spring application.
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Top Answer
Answered May 09, 2019 · 62 votes
TLDR: This behavior is absolutely normal.
Why can't Lease Management be smooth & exception-free: To give more control on the situation to developer.
The really long story - all-the-way from Basics EventProcessorhost (hereby EPH - is very similar to what __consumer_offset topic does for Kafka Consumers - partition ownership & checkpoint store) is written by Microsoft Azure EventHubs team themselves - to translate all of the EventHubs partition receiver Gu into a simple onReceive(Events) callback.
EPH is used to address 2 general, major, well-known problems while reading out of a high-throughput partitioned streams like EventHubs:
- fault tolerant receive pipe-line - for ex: a simpler version of the problem - if the host running a PartitionReceiver dies and comes back - it needs to resume processing from where it left. To remember the last successfully processed EventData , EPH uses the blob supplied to EPH constructor to store the checkpoints - when ever user invokes context.CheckpointAsync() . Eventually, when the host process dies (for ex: abruptly reboots or hits a hardware fault and never/comesback) - any EPH instance can pick up this task and resume from that Checkpoint .
- Balance/distribute partitions across EPH instances - lets say, if there are 10 partitions and 2 EPH instances processing events from these 10 partitions - we need a way to divide partitions across the instances ( PartitionManager component of EPH library does this). We use Azure Storage - Blob LeaseManagement-feature to implement this. As of version 2.2.10 - to simplify the problem, EPH assumes that all partitions are loaded equally.
With this, lets try to see what's going on: So, to start with, in the above example of 10 event hub partitions and 2 EPH instances processing events out of them:
- lets say the first EPH instance - EPH1 started, at-first, alone and a part of start-up, it created receivers to all 10 partitions and is processing events. In the start up - EPH1 will announce that it owns all these 10 partitions by acquiring Leases on 10 storage blobs representing these 10 event hub partitions (with a standard nomenclature- which EPH internally creates in the Storage account - from the StorageConnectionString passed to the ctor). Leases will be acquired for a set time, after which the EPH instance will loose the ownership on this Partition.
- EPH1 continually announces once in a while - that it is still owning those partitions - by renewing leases on the blob. Frequency of renewal, along with other useful tuning, can be performed using PartitionManagerOptions
- now, lets say, EPH2 starts up - and you supplied the same AzureStorageAccount as EPH1 to the ctor of EPH2 as well. Right now, it has 0 partitions to process. So, to achieve balance of partitions across EPH instances, it will go ahead and download the list of all leaseblobs which has the mapping of owner to partitionId. From this, it will STEAL leases for its fair share of partitions - which is 5 in our example, and will announce that information on that lease blob. As part of this, EPH2 reads the latest checkpoint written by PartitionX it wants to steal the lease for and goes ahead and creates corresponding PartitionReceiver's with the EPOCH same as the one in the Checkpoint.
- As a result, EPH1 will loose ownership of these 5 partitions and will run into different errors based on the exact state it is in. if EPH1 is actually invoking the PartitionReceiver.Receive() call - while EPH2 is creating the PartitionReceiver on the same receiver - EPH1 will experience ReceiverDisconnectedException. This will eventually, invoke IEventProcessor.Close(CloseReason=LeaseLost). Note that, probability of hitting this specific Exception is higher, if the messages being received are larger or the PrefetchCount is smaller - as in both cases the receiver would be performing more aggressive I/O.
- if EPH1 is in the state of checkpointing the lease or renewing the lease, while the EPH2 stole the lease, the EventProcessorOptions.ExceptionReceived eventHandler would be signaled with a leaselostException (with 409 conflict error on the leaseblob) - which also eventually invokes IEventProcess.Close(LeaseLost).
Why can't Lease Management be smooth & exception-free:
To keep the consumer simple and error-free, lease management related exceptions could have been swallowed by EPH and not notified to the user-code at all. However, we realized, throwing LeaseLostException could empower customers to find interesting bugs in IEventProcessor.ProcessEvents() callback - for which the symptom would be - frequent partition-moves
- minor network outage on a specific machine - due to which EPH1 fails to renew leases and comes back up! - and imagine if the n/w of this machine stands flaky for a day - EPH instances are going to play ping-pong with Partitions! This machine will continuously try to steal the lease from other machine - which is legitimate from EPH point-of-view - but, is a total disaster for the user of EPH - as it completely interferes with the processing pipe. EPH - would exactly see a ReceiverDisconnectedException, when the n/w comes back up on this flaky m/c! We think the best and infact the only way is to enable the developer to smell this!
- or a simple scenario like, having a bug in ProcessEvents logic - which throws unhandled exceptions which are fatal and brings down the whole process - ex: a poison event. This partition is going to move around a lot.
- customers, performing write/delete operations on the same storage account which EPH is also using - by mistake (like an automated clean-up script) etc.
- last but not the least - which we never wish could happen - say a 5 min outage on Azure d.c where a specific EventHub.Partition is located - say n/w incident. Partitions are going to move around across EPH instances.
Basically, in majority of situations, it would be tricky - for us to detect the diff. between these situations and a legitimate leaseLost due to balancing and we want to delegate control of these situations to the Developer.
more on Event Hubs...
1/5
Top Answer
Answered Feb 11, 2022 · 28 votes
If you are using Spring Boot you should choose org.springframework.boot:spring-boot-starter-oauth2-client. This includes Spring Security's OAuth 2.0 Client support and provides Spring Boot auto-configuration to set up OAuth2/Open ID Connect clients. You can read about how to configure client in the Spring Boot reference documentation. You can also find additional details in the Spring Security reference documentation.
If you are not using Spring Boot then you should choose org.springframework.security:spring-security-oauth2-client. This also provides Spring Security's latest OAuth 2.0 Client support, but does not include the Spring Boot auto-configuration. The corresponding documentation is also the Spring Security reference documentation.
The third dependency you mentioned org.springframework.security.oauth:spring-security-oauth2 should not be used because it is part of the legacy Spring Security OAuth project, which is now deprecated. The functionality that this library provided has now been moved into Spring Security. That is what the Migration Guide describes, the migration from the legacy project to the latest Spring Security support.
You should not use the org.springframework.cloud:spring-cloud-starter-oauth2 at this time, because it relies on the legacy OAuth support. This is likely to change in the future, as the Spring Cloud team updates to the latest Spring Security support.
2/5
Top Answer
Answered Apr 06, 2015 · 80 votes
Spring Boot is app-centric. As @kryger said, Spring Cloud builds on boot. It solves higher level problems, such as:
- Distributed configuration: How to configure every instance of all of your services (standard boot config files checked into git or svn and distributed via config server).
- Service registration and discovery: how to locate a specific instance of a service (using Netflix Eureka)
- Client Side load balancing: intelligently choose an instance of a service to use (using Netflix Ribbon) via a smart algorithm such as: round robin or response time
- Plug into Ribbon via Spring Rest Template or Netflix Feign.
- Serve all assets and api's via a proxy that is plugged into service discovery and load balancing (Netflix Zuul).
- Stop cascading api failures with the Circuit Breaker pattern via Netflix Hystrix and visualize the health of all circuits with the Hystrix Dashboard.
- Send commands to all or some services via a lightweight message bus.
- Use oauth2 to protect resources
- and other things I've probably forgotten.
3/5
There are many reasons to use Spring Framework for example if you want faster development, less configuration, auto-configuration, embedded server, production-ready application, and many more. But apart from that most importantly we have ready-made support for microservices and this ready-made support is available through Spring Cloud.
Spring Cloud is a collection of projects like load balancing, service discovery, circuit breakers, routing, micro-proxy, etc will be given by Spring Cloud. So spring Cloud basically provides some of the common tools and techniques and projects to quickly develop some common patterns of the microservices.
Spring Cloud Features
Some of the major features that are available in Spring Cloud are listed below
- Distributed/versioned configuration
- Service registration and discovery
- Routing
- Service-to-service calls
- Load balancing
- Circuit Breakers
- Distributed messaging
Add Spring Cloud BOM to Your Application
To add the Spring Cloud BOM to Your Application you have to add the following dependency.
In Maven:
<properties> <spring-cloud.version>2022.0.1</spring-cloud.version></properties><dependencyManagement> <dependencies>lt dependency...
4/5
Top Answer
Answered Aug 14, 2018 · 19 votes
It might help to think of a division between infrastructure, applications and platform. Think of infrastructure as hardware - servers, disk, compute, network routing etc. that you can use. Let's call 'application' the executables that you build from your code in order to implement business logic and satisfy your end users. Then platform is a connecting layer - tools and standards to help your applications make use of infrastructure.
AWS is most famous for providing cloud infrastructure but it also provides a lot of services that could fall under platform. For example, it provides an API gateway service and container orchestration services with ECS or EKS (kubernetes) - these are more platform-level services as they are services that help your applications to scale and to talk to each other in the cloud.
Spring Cloud is a set of tools that help you address common problems faced by cloud applications. Concerns like how to get applications to talk reliably to each other in the cloud (eureka, hystrix and ribbon for http, streams for messaging) how to provide a single entry-point for consumers to access a set of microservices (zuul and spring cloud gateway) and how to manage configuration across microservices (spring cloud config). Mostly I would put these concerns under 'platform' but there are grey areas. You normally add the spring cloud libraries to components you build, which is a bit more 'application'-like. Some of the same concerns are addressed by certain services available in AWS (especially ECS and EKS(kubernetes)).
So the core areas of concern are very different for AWS (primarily infrastructure) and spring cloud (platform or platform-application bridge). But there can be some overlap at the platform level because AWS and spring cloud both offer so many options. It is tricky to find any direct comparisons because there are so many options but if you focus on EKS(kubernetes) in particular a good article comparing it with spring cloud is https://dzone.com/articles/deploying-microservices-spring-cloud-vs-kubernetes
5/5
People also ask
What is Spring Cloud Azure Event Hubs starter?
- The Spring Cloud Azure Event Hubs Starter module imports the Event Hubs Java client library with the Spring Boot framework. You can use Spring Cloud Azure and the Azure SDK together, in a non-mutually exclusive pattern. Thus, you can continue using the Event Hubs Java client API in your Spring application.
Using Event Hubs in Spring applications - Java on Azure
learn.microsoft.com/en-us/azure/developer/java/spring-framework/using-event-hubs-in-spring-applicationsWhat are Spring Cloud Azure starters?
- Spring Cloud Azure Starters are a set of convenient dependency descriptors to include in your application. Each starter contains all the dependencies and transitive dependencies needed to begin using their corresponding Spring Cloud Azure module. These starters boost your Spring Boot application development with Azure services.
Spring Cloud Azure overview - Java on Azure | Microsoft Learn
learn.microsoft.com/en-us/azure/developer/java/spring-framework/developer-guide-overviewWhat is Spring Cloud Azure Event Hubs binder?
- Spring Cloud Azure Stream Event Hubs Binder enables you to use Event Hubs as a messaging middleware in Spring Cloud Stream applications. Spring Kafka with Azure Event Hubs enables you to use Spring Kafka to send messages to and receive messages from Event Hubs.
Using Event Hubs in Spring applications - Java on Azure
learn.microsoft.com/en-us/azure/developer/java/spring-framework/using-event-hubs-in-spring-applicationsWhat's new in Spring Cloud Azure?
- Simplified dependency management using a single spring-cloud-azure-dependencies BOM. Expanded Azure support on Spring Initializr to cover Kafka, Event Hubs, Azure Cache for Redis, and Azure App Configuration. Rearchitected Spring module dependencies to remove excess layers and entanglement.
Spring Cloud Azure overview - Java on Azure | Microsoft Learn
learn.microsoft.com/en-us/azure/developer/java/spring-framework/developer-guide-overviewlearn.microsoft.com › en-us › azureUsing Event Hubs in Spring applications - Java on Azure
learn.microsoft.com › en-us › azureJan 17, 2024 · Use Spring Cloud Azure Event Hubs Starter. The Spring Cloud Azure Event Hubs Starter module imports the Event Hubs Java client library with the Spring Boot framework. You can use Spring Cloud Azure and the Azure SDK together, in a non-mutually exclusive pattern.
stackoverflow.com › questions › 63557789What is the difference between azure-eventhubs and spring ...
stackoverflow.com › questions › 63557789Aug 24, 2020 · In the first one the article shows you how to use the Java SDK for Event Hubs in a "classic" java application. The second article explain how to use Event Hubs in a Spring Boot Java application (Spring Boot is an open-source framework maintained by Pivotal).
microsoft.github.io › spring-cloud-azure › docsSpring Cloud Azure - GitHub Pages
microsoft.github.io › spring-cloud-azure › docsSpring Cloud Azure Starters are a set of convenient dependency descriptors to include in your application. Each starter contains all the dependencies and transitive dependencies needed to begin using their corresponding Spring Cloud Azure module. It boosts your Spring Boot application development with Azure services.
medium.com › @husseinkaraki › spring-boot-kafka-onA Quick Guide to Spring Boot + Kafka on Azure Event Hubs
medium.com › @husseinkaraki › spring-boot-kafka-onApr 29, 2019 · This is a quick guide on how to implement Kafka in Spring Boot against Azure’s Event Hubs. I found the tutorials online did not provide exactly what I was looking for, and after we finished...
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