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1. Async Excellence
Unlocking Scalability with Kafka
Natan Silnitsky, Wix Engineering April 2025

2. Hi,
I’m Natan
Async Excellence
natansilnitsky
www.natansil.com
@NSilnitsky
@natan-s.bsky.social
Backend Infra Tech Lead @Wix
Speaker
Blogger
Yoga & Fitness enthusiast

3. Async Excellence

4. Microservices Communication
Sync Model
Checkout
HTTP
Checkout
Service
Price?
HTTP RPC
Available?
HTTP RPC
On sale?
HTTP RPC
Catalog
Service
Inventory
Service
Ribbons
Service
Async Excellence

5. Microservices Communication
Sync Model
Checkout
HTTP
Checkout
Service
Price?
HTTP RPC
Available?
HTTP RPC
On sale?
HTTP RPC
Catalog
Service
Inventory
Service
Ribbons
Service
Async Excellence

6. Checkout
HTTP
Checkout
Service
Price?
HTTP RPC
Available?
HTTP RPC
On sale?
HTTP RPC
Catalog
Service
Inventory
Service
Ribbons
Service
Notifications
Service
Invoices
Service
Create
Invoice
Send
emails
Microservices Communication
Sync Model

7. Checkout
HTTP
Checkout
Service
Price?
HTTP RPC
Available?
HTTP RPC
On sale?
HTTP RPC
Catalog
Service
Inventory
Service
Ribbons
Service
Notifications
Service
Invoices
Service
Create
Invoice
Send
emails
Microservices Communication
Sync Model

8. Microservices Communication
Async Model
async
Catalog
Service
Inventory
Service
Ribbons
Service
Notifications
Service
Invoices
Service
asyncasync
sync
async
async
Checkout
Service
async

9. Task Queue
Task Scheduler
AGENDA
Integration Events
Iterator
Async Excellence

10. 1.
Integration Events
Async Excellence

11. Decouple Services
Order Created
Order Updated
Order Deleted
Inventory
Service
Payment
Service
Notifications
Service
Orders
Service
Fulfillment
Service
Loyalty
Service
Invoices
Service
Integration Events

12. Avoid multiple synchronous read calls
Checkout
HTTP
Checkout
Service
Price?
HTTP RPC
Available?
HTTP RPC
On sale?
HTTP RPC
Catalog
Service
Inventory
Service
Ribbons
Service
Async Excellence
Integration Events

13. Avoid multiple synchronous read calls
Checkout
HTTP
Checkout
Service
Price?
HTTP RPC
Available?
HTTP RPC
On sale?
HTTP RPC
Catalog
Service
Inventory
Service
Ribbons
Service
Async Excellence
Integration Events

14. Pre-Fetching data
Async Excellence
Catalog
Service
Inventory
Service
Product Entity
InventoryItemUpdated
Update
Inventory
Integration Events

15. Persist and Publish
Inventory Service
CreateInventoryItem
UpdateInventoryItem
DeleteInventoryItem
Inventory
Document
Store
1 2
InventoryItem Created
InventoryItem Updated
InventoryItem Deleted
Async Excellence
Integration Events

16. Events Definitions
●payload based on
proto definition
of the main service entity


●inside a standard envelope
also defined in proto
message InventoryItem {
option (entity) = {fqdn: "...v2.inventoryItem"};
google.protobuf.StringValue id = 1;
...
int32 quantity = 5;
...
}


message IntegrationEvent {
string id = 1;
...
oneof body {
EntityCreatedEvent created_event = 7;
...
}
...
int64 entity_event_sequence = 11;


Async Excellence
Integration Events

17. message InventoryItem {
option (entity) = {fqdn: "...v2.inventoryItem"};
google.protobuf.StringValue id = 1;
...
int32 quantity = 5;
...
}


Auto Topic Creation
InventoryItem Updated
InventoryItem Deleted
InventoryItem Created
inventory_item_v2_integration_events
Auto-generated topic according
to proto (entity) annotations
Async Excellence
012345
Integration Events

18. `
`
Update Embedded Entity
Async Excellence
Catalog
Service
Inventory
Service
message Product {
option (entity) = {fqdn: "...v3.product"};
google.protobuf.StringValue id = 1;
google.protobuf.Int64Value revision = 2;
...
repeated Inventory inventory = 25;
...
}


Product Entity
InventoryItemUpdated
Update
Inventory
Integration Events

19. `
Update Embedded Entities
Async Excellence
Catalog
Service
Inventory
Service
Ribbons
Service
Product Entity
Update
Inventory /
Ribbon
InventoryItemUpdated
RibbonUpdated
Integration Events

20. Avoid multiple synchronous read calls
Checkout
HTTP
Checkout
Service
Price+Available+
OnSale?
HTTP RPC
Catalog
Service
Inventory
Service
Ribbons
Service
Async Excellence
Integration Events

21. More Integrations
InventoryItem Updated
InventoryItem Deleted
InventoryItem Created
inventory_item_v2_integration_events Data warehouse/Lake
Search Engine
External Wix APIs
Async Excellence
Integration Events

22. DRAWBACKS
Async Excellence
Waste
Integration Events

23. DRAWBACKS
Async Excellence
Waste
Integration Events
Consumer Lags

24. DRAWBACKS
Async Excellence
Consumer Lags
Data Corruption
Waste
Integration Events

25. Integration
Events
●Promote Decoupled Design
●Boost Query Optimization
●Drawbacks:
○Resource Waste
○Eventual Consistency

26. Integration
Events
●Promote Decoupled Design
●Boost Query Optimization
●Drawbacks:
○Resource Waste
○Eventual Consistency

27. 2.
Task Queue
Async Excellence

28. Avoid multiple synchronous write calls
Checkout
HTTP
Checkout
Service
Notifications
Service
Invoices
Service
Create
Invoice
Send
emails
Async Excellence
Task Queue

29. Avoid multiple synchronous write calls
Checkout
HTTP
Checkout
Service
Invoices
Service
Create
Invoice
Send
emails
Notifications
Service
Async Excellence
Task Queue

30. Submit to Queue
Checkout
HTTP


Checkout
Service
queue.submit
012345
Kafka Consumer Kafka Producer
Generate Invoice
Task Topic
Generate Invoice Task Queue
Task Queue

31. Code Example
generateInvoiceQueue = createTaskQueue("generate-invoice", handleInvoiceCreation)
Checkout
HTTP
Checkout
Service
queue.submit
Generate Invoice Task Queue
Task Queue

32. Code Example
generateInvoiceQueue = createTaskQueue("generate-invoice", handleInvoiceCreation)


handler function handleInvoiceCreation(payload: InvoicePayload) {
orderId = payload.order.getId
generateInvoice(payload)
}

Checkout
HTTP
Checkout
Service
Generate Invoice Task Queue
queue.submit
Task Queue

33. Code Example
generateInvoiceQueue = createTaskQueue("generate-invoice", handleInvoiceCreation)


handler function handleInvoiceCreation(payload: InvoicePayload) {
orderId = payload.order.getId
generateInvoice(payload)
}

generateInvoiceQueue.submit(generateInvoicePayload)
Checkout
HTTP
Checkout
Service
Generate Invoice Task Queue
queue.submit
Task Queue

34. Response Time Improved
Checkout
HTTP
Checkout
Service
Generate Invoice Task Queue
queue.submit
Send notification Task Queue
Async Excellence
Task Queue

35. DRAWBACKS
Async Excellence
Monitoring
Task Queue

36. DRAWBACKS
Async Excellence
Monitoring
Consumer Lags
Task Queue

37. DRAWBACKS
Async Excellence
Monitoring
Task Pipeline
Consumer Lags
Task Queue

38. Task
queue
●Decouple Background Work
●Improve Response Times
●Drawback - Monitoring Is
More Complex

39. 3.
Task Scheduler
Async Excellence

40. Delay an action
Checkout
HTTP
Checkout
Service
Maybe Cart
abandoned
Async Excellence
Task Scheduler

41. 1. Delayed Kafka Consumer
Checkout
HTTP
Checkout
Service
012345
Kafka Consumer Kafka Producer
Task Scheduler

42. 1. Delayed Kafka Consumer - Bottleneck
012
Kafka Consumer
60 m.
15 m.
Async Excellence
Task Scheduler

43. 1. Delayed Kafka Consumer - Bottleneck
012
Kafka Consumer
60 m.
15 m.
Wait 60 minutes instead of 15 m.
Async Excellence
Task Scheduler

44. Schedule a Task
Checkout
Checkout
Service
scheduler.submit
Scheduler Service
RPC
Async Excellence
Task Scheduler

45. Persist
Checkout
Checkout
Service
scheduler.submit
Scheduler
Insert
Task
RPC
Async Excellence
Task Scheduler

46. Poll
Checkout
Checkout
Service
scheduler.submit
Scheduler
Insert
TaskPoll
Async Excellence
Task Scheduler

47. Sharding
Checkout
Checkout
Service
scheduler.submit
Scheduler
Insert
TaskPoll
SHARDS
Async Excellence
Task Scheduler

48. Trigger Task - Publish
Checkout
Checkout
Service
scheduler.submit
Scheduler
Kafka Producer
Insert
TaskPoll
60 m.
Async Excellence
Task Scheduler

49. `
Consume & Process
Checkout
Checkout
Service
scheduler.submit
Scheduler
Kafka Producer
Insert
TaskPoll
Kafka
Consumer
60 m.
Task Scheduler

50. `
Retry on Failure
Checkout
Checkout
Service
scheduler.submit
Scheduler
Kafka Producer
Insert
TaskPoll
Kafka
Consumer
60 m.
Task Scheduler

51. DRAWBACKS
Async Excellence
DB load
Task Scheduler

52. DRAWBACKS
Async Excellence
DB load
At least once
Task Scheduler

53. DRAWBACKS
Async Excellence
DB load
At least once
Trigger Lag
Task Scheduler

54. Open Source Task Schedulers
Async Excellence
Task Scheduler

55. Task
Scheduler
●Ensure Delayed Task
Reliability
●Easily Test Recurring Tasks
●Drawback - Duplicate
scheduling

56. Task
Scheduler
●Ensure Delayed Task
Reliability
●Easily Test Recurring Tasks
●Drawback - Duplicate
scheduling

57. 4.
Iterator
Async Excellence

58. Async Excellence
Iterator

59. Avoid retrying a long running bulk job
Update ribbons
HTTP
Catalog
Service
Products Table
Query page 1
Query page N
…
Async Excellence
Iterator

60. Avoid retrying a long running bulk job
Update ribbons
HTTP
Catalog
Service
Products Table
Query page 1
Query page N
…
Async Excellence
Iterator

61. Avoid retrying a long running bulk job
Update ribbons
HTTP
Catalog
Service
queue.submit
Update Ribbons Task Queue
Kafka Producer
Async Excellence
Iterator

62. Avoid retrying a long running bulk job
Update ribbons
HTTP
Catalog
Service
queue.submit
Update Ribbons Task Queue
Kafka Producer
Kafka Consumer
Query ALL pages
Products Table
Query
page 1
Query
page N…
Async Excellence
Iterator

63. Avoid retrying a long running bulk job
Update ribbons
HTTP
Catalog
Service
queue.submit
Update Ribbons Task Queue
Kafka Producer
Kafka Consumer
Query ALL pages
Products Table
Query
page 1
Query
page N…
Async Excellence
Iterator

64. Avoid retrying a long running bulk job
Update ribbons
HTTP
Catalog
Service
queue.submit
Update Ribbons Task Queue
Kafka Producer
Products Table
Query
page 1
Query
page N…
Kafka Consumer
Async Excellence
Iterator

65. Avoid retrying a long running bulk job
Update ribbons
HTTP
Catalog
Service
queue.submit
Update Ribbons Task Queue
Kafka Producer
Products Table
Query
page 1
Query
page N…
Kafka Consumer
Async Excellence
Iterator

66. Iterator Library
Update ribbons
HTTP
Catalog
Service
Iterator.submit
Update ribbons Iterator Lib.
Async Excellence
Iterator

67. Split to Chunks
Update ribbons
HTTP
Catalog
Service
Iterator.submit
Update ribbons Iterator Lib.
Products Table
Producer:
Query page X+1
Consumer
Async Excellence
Producer:
Query page X
Iterator

68. Small Retry Blast Radius
Update ribbons
HTTP
Catalog
Service
Iterator.submit
Update ribbons Iterator Lib.
Products Table
Producer:
Query page X+1
Consumer
Async Excellence
Producer:
Query page X
Iterator

69. Small Retry Blast Radius
Update ribbons
HTTP
Catalog
Service
Iterator.submit
Update ribbons Iterator Lib.
Products Table
Producer:
Query page X+1
Consumer
Async Excellence
Producer:
Query page X
Iterator

70. Any Queryable source
Update inventory
HTTP
Catalog
Service
Iterator.submit
Update Inventory Iterator Lib.
Inventory
Service
Producer:
Query page X+1
Consumer
Async Excellence
Producer:
Query page X
Iterator

71. Code Example
Update ribbons
HTTP
Catalog
Service
Iterator.submit
Update Inventory Iterator Lib.
Async Excellence

function handleRibbonUpdate(query: Query, param: RibbonUpdateParam): Chunk {
productsPage = fetchProductsByFilter(query)

updatedProducts = updateProductRibbonBulk (productsPage, param.ribbonType)

return Chunk(updatedProducts, Iteration.Continue(Query. nextPage, param))
}
Iterator

72. Code Example
Update ribbons
HTTP
Catalog
Service
Iterator.submit
Update Inventory Iterator Lib.
Async Excellence

function handleRibbonUpdate(query: Query, param: RibbonUpdateParam): Chunk {
productsPage = fetchProductsByFilter(query)

updatedProducts = updateProductRibbonBulk (productsPage, param.ribbonType)

return Chunk(updatedProducts, Iteration.Continue(Query. nextPage, param))
}
Iterator

73. Code Example
Update ribbons
HTTP
Catalog
Service
Iterator.submit
Update Inventory Iterator Lib.
Async Excellence

function handleRibbonUpdate(query: Query, param: RibbonUpdateParam): Chunk {
productsPage = fetchProductsByFilter(query)

updatedProducts = updateProductRibbonBulk (productsPage, param.ribbonType)

return Chunk(updatedProducts, Iteration.Continue(Query. nextPage, param))
}
Iterator

74. Monitor progress
Update ribbons
HTTP
Catalog
Service
Iterator.submit
Update Inventory Iterator Lib.
Async Excellence
Job Service
Iterator

75. DRAWBACKS
Async Excellence
At least once
Iterator

76. DRAWBACKS
Async Excellence
At least once
Kafka overhead
Iterator

77. Iterator
●Simplifies Data Traversal
●Fault Tolerance
●Drawback - Potential
Performance Impact

78. Kafka alternative - Workflow engines
Async Excellence

79. Workflow Engines & Event Streaming Brokers - Can They Work Together?
Async Excellence

80. Future Plans
Async Excellence
Small-Scale Task Pipelines
Balance Modular Design
Polling for External
Results

81. Which pattern to use?
(e.g., inventory,
pricing, or availability
optimization)
(e.g., emails,
notifications
post-checkout)
(e.g., bulk updates,
distributed
processing).
(e.g., send
notifications, CRON
jobs)
Pre-fetch data
Handle tasks with
side effects
Split tasks into
chunks
Manage CRON and
one-time postponed
tasks
Integration Events
Pattern
Task Queue Pattern Iterator Pattern
Task Scheduler
Pattern
Yes Yes Yes Yes
What performance and resilience issue are you solving?
Handling
Long-running Jobs?
Need Delayed
Execution or
Recurring Tasks?
Decoupling
Non-critical Write
Tasks?
Avoiding High
Latency on Reads?

82. Summary
Transition to Async Patterns
Removed bottlenecks, reduced latency
Improved Scalability, fault tolerance
Lessons from Real-World Challenges

83. Async Excellence
Dive Deeper…
Battle Tested, Event-Driven Patterns for
your Microservices Architecture
Lessons Learned From Working with 2000
Event-Driven Microservices

84. Thank you
Q & A
www.natansil.com
@NSilnitsky
@natan-s.bsky.social
?????? slideshare.net/NatanSilnitsky