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24
Overcome By Events:
Apache Kafka &
Event-oriented Architecture
Jay Kreps
2525
Overcome By Events (OBE)
25
A term of military origin used when
a situation changes so rapidly that
previously proposed courses of
action are no longer relevant.
26
What is an event?
27
Events
28
Events
A Sale
A Trade
An Invoice
A Customer Experience
2929
Here!
Where are they?
Events haven’t had a proper
home in infrastructure or
in code. They are implicit.
30
Where do
events show
up?
● Microservices
● Monitoring
● Data Pipelines
● Analytics
3131
Microservices Synchronous doesn’t scale
3232
ServerlessMicroservices
3333
Event SourcingMicroservices
34
Old School
4 Pillars
● Metrics
● Alerting
● Distributed Tracing
● Log Aggregation
Monitoring
35
Old School
4 Pillars
● Metrics
● Alerting
● Distributed Tracing
● Log Aggregation
Monitoring
Event Processing
New School
36
Log AggregationMonitoring
37
MetricsMonitoring
38
Metrics
SELECT HOST,
COUNT(*) AS ERROR_RATE
FROM LOGS
WINDOW TUMBLING (SIZE 5 MINUTES)
WHERE LOG_SEVERITY='ERROR'
GROUP BY HOST;
Monitoring
39
AlertingMonitoring
40
Alerting
CREATE TABLE SLA_BREACH AS
SELECT HOST, COUNT(*) AS ERROR_RATE
FROM LOGS
WINDOW TUMBLING (SIZE 5 MINUTES)
WHERE LOG_SEVERITY='ERROR'
GROUP BY HOST
HAVING COUNT(*) > 10;
Monitoring
41
Distributed TracingMonitoring
42
Distributed TracingMonitoring
SELECT HOST, APP, TIMESTAMP,
USERID, USER_NAME, USER_EMAIL
FROM LOGS L
INNER JOIN USERS U
ON L.USERID=U.USERID
WHERE TRACE_ID='40e9bea3-de9b-4004';
43
Data Pipelines
44
Data Pipelines
45
Data WarehousingAnalytics
LOCATION
PK Location_ID
Name
State
Pincode
TIME
PK Time_ID
Day
Month
Quarter
Year
BRANCH
PK Branch_ID
Branch_NM
Owner
ITEM
PK Item_Key
Item_Name
Brand
Sold_By
Category
FK ITEM_KEY
FK TIME_ID
FK BRANCH_ID
FK LOCATION_ID
QTY_SOLD
AMT_SOLD
AVG_SALES
Branch dimension table
Item dimension table
Location dimension table
Time dimension table
Sales Fact Table
STAR SCHEMA
46
Analytics
Real-time Analytics
and Machine
Learning on Event
Streams
47
A business is a series of events and the
reactions to those events.
Events are everywhere
4848
The Infrastructure for Events
49
Traditionally,
there is none.
5050
You need both these things
Tables
The current state of
the world
Events
What’s happening in
the world
5151
Table Stream Duality
52
The
Streaming
Platform
53
Key Elements of
Apache Kafka
54
01
Immutable log-
centric
architecture
55
02
Support
for tables
with Log
Compaction
56
03
Horizontally
scalable
Custom Apps
57
03
Horizontally
scalable
Custom Apps MonitoringMicroservices
Bloomberg SFDC
TwitterOracle Hadoop
58
Custom Apps
Bloomberg
Microservices Monitoring AnalyticsWeb
SFDC
TwitterOracle Hadoop
Data
Warehouse
NoSQL
any sinkany source
03
Horizontally
scalable
59
04
Connector
Architecture
60
05
Transactional
semantics
for stream
processing
BEGIN
Read Input
Update State
Write Output
COMMIT
61
Community
and
Ecosystem
112
Meetup groups
282,011
meetup members
62
The
Streaming
Platform
63

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