Questions tagged [eventual-consistency]
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79 questions
5 votes
3 answers
1k views
How to design a distributed system with an event broker where strong ordering is required?
I was trying to model a fairly simple real world model inside a distributed system and got stuck thinking about timing and order and would appreciate some external view on it. Assuming I have this ...
- 799
1 vote
3 answers
158 views
Does quorum protocols circumvent fundamental limitations posed by the CAP theorem?
I can have multiple replicas of my database to ensure high availability. Then I can have a quorum such that R+W > N to ensure consistency. So does strategies like quorum base read/write or ...
- 1,450
1 vote
0 answers
174 views
DDD -Can an aggregate consumes its own events?
I'm facing to an issue with my design in DDD with "Always valid Domain Model" principale and eventual consistency. I have an aggregate with several public methods to mutate its state. class ...
-2 votes
1 answer
224 views
What is the difference between Eventual Consistency, Strong Eventual Consistency, and Causal Consistency?
I read articles about CRDTs and frequently come across the terms 'Strong Eventual Consistency,' 'Eventual Consistency,' and 'Causal Consistency.' What is the relationship between these consistency ...
- 11
2 votes
2 answers
229 views
Avoid updating multiple Aggregates in Library Application
I am currently analysing the project ddd-library which is really helping in learning designing a system based on DDD principles. However there is one thing I have a problem with. In case of placing a ...
- 37
0 votes
0 answers
226 views
Event sourcing, bulk update and storing multiple events vs one event with multiple ids
Event-sourcing often implies to have one row per aggregate id : event_id event_type entity_type entity_id event_data 102 OrderCreated Order 101 {...} 103 OrderUpdated Order 101 {...} This is perfectly ...
- 51
0 votes
1 answer
709 views
Ordering events across multiple topics in a distributed system
Our platform is growing in the number of events we're raising, and these different events are often related to one another: ProductCreated ProductUpdated ProductTakenOffSale ProductPutOnSale ...
- 323
1 vote
2 answers
94 views
Phantom read race condition keeping RDBMS in sync with external storage
Here's an interesting scenario, consider a cache with many buckets, and resources that can be shared between buckets: Bucket Highest to lowest priority Foo A, B, C, D Bar B, C, D Baz A In the example ...
- 111
3 votes
0 answers
277 views
Microservice architecture but with strong data consistency [closed]
I'm working on a project that has microservice based architecture. Recently we started facing problems where a single user requests requires updating multiple microservices each having it's own ...
- 139
0 votes
0 answers
76 views
Designing Aggregate Roots with Logic Spanning over Roots
This seems like a common scenario that someone must have solved by now! I have a setup where a Company may have a set of Default Roles assigned, and Users of that Company should inherit those roles. ...
- 193
2 votes
1 answer
652 views
Internal/external commands in CQRS
I have several questions related to CQRS in eventually consistent systems with a need of resilient Command/Event processing. Is it OK to have external/public synchronous Commands (triggered by API, e....
- 121
0 votes
1 answer
1k views
Handling asynchronous domain events with multiple handlers & allowing them to fail independently
We're building a service using DDD, CQRS, & Hexagonal Architecture that allows the user to upload a CSV feed for which every row will be transformed and sent to a third party over HTTP. We have ...
- 121
2 votes
3 answers
362 views
Foreign key check without data duplication in separate microservices
If for example we have a user, project and a task service where a task is assigned to a single user and user can be part of multiple projects - how can one enforce a rule so that one cannot assign a ...
- 21
1 vote
2 answers
266 views
How is cross device eventual consistency achieved in real time?
Assume there is a distributed system which works on the principles of eventual consistency. Let's consider a scenario where I update my profile picture using my phone. If I log in using another system,...
- 121
-1 votes
2 answers
357 views
Transactional and eventual consistency together -- which operations MUST be transactionally consistent?
I find a lot of resources regarding strong consistency versus eventual consistency, and when to choose one or the other. I'm wondering how and when you would have both together. Consider this specific ...
- 115