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@nicolas_frankel
A CDC use-case:
Designing an Evergreen
Cache
Nicolas Fränkel
@nicolas_frankel
Me, myself and I
 Former developer, team lead, architect,
blah-blah
 Developer Advocate
 Interested in CDC and data streaming
@nicolas_frankel
Hazelcast
HAZELCAST IMDG is an operational,
in-memory, distributed computing
platform that manages data using
in-memory storage and performs
execution for breakthrough
and scale.
HAZELCAST JET is the ultra
fast, application embeddable,
3rd generation stream
processing engine for low
latency batch and stream
processing.
@nicolas_frankel
Agenda
1. Why cache?
2. Alternatives to keeping the cache in sync
3. Change-Data-Capture (CDC)
4. Debezium, a CDC implementation
5. Hazelcast Jet + Debezium
6. Demo!
@nicolas_frankel
The caching trade-off
 Improved performance/availability
 Stale data
@nicolas_frankel
The initial state
1. The application
2. The RDBMS
3. The cache
@nicolas_frankel
Aye, there’s the rub!
 A new component
writes to the
database
 E.g.: a table holding
references needs to
be updated every
now and then
@nicolas_frankel
How to keep the cache in sync with the DB?
@nicolas_frankel
Cache invalidation
“There are two hard things in computer
science:
1. Naming things
2. Cache invalidation
3. And off-by-one errors”
@nicolas_frankel
Cache eviction vs Time-To-Live
 Cache eviction: which entities to evict
when the cache is full
• Least Recently Used
• Least Frequently Used
 TTL: how long will an entity be kept in
the cache
@nicolas_frankel
Choosing the “correct” TTL
 Less frequent than the update frequency
• Miss updates
 More frequent than the update frequency
• Waste resources
@nicolas_frankel
Polling process
Same issue regarding the frequency
@nicolas_frankel
Event-driven for the win!
1. If no writes happen, there's no need to
update the cache
2. If a write happens, then the relevant
cache item should be updated
accordingly
@nicolas_frankel
RDMBS triggers
 Not all RDBMS implement triggers
 How to call an external process from the
trigger?
@nicolas_frankel
The example of MySQL: User-defined function
 Functions must be written in C++
 The OS must support dynamic loading
 Becomes part of the running server
• Bound by all constraints that apply to
writing server code
 Etc.
-- https://dev.mysql.com/doc/refman/8.0/en/adding-udf.html
@nicolas_frankel
lib_mysqludf_sys
UDF library with functions to interact with the operating system
CREATE TRIGGER MyTrigger
AFTER INSERT ON MyTable
FOR EACH ROW
BEGIN
DECLARE cmd CHAR(255);
DECLARE result INT(10);
SET cmd = CONCAT('update_row', '1');
SET result = sys_exec(cmd);
END;
-- https://github.com/mysqludf/lib_mysqludf_sys
@nicolas_frankel
Cons
 Implementation-dependent
 Fragile
 Who maintains/debugs it?
 Resource-consuming if done frequently
@nicolas_frankel
Change-Data-Capture
“In databases, Change Data Capture is a set
of software design patterns used to determine
and track the data that has changed so that
action can be taken using the changed data.
CDC is an approach to data integration that is
based on the identification, capture and
delivery of the changes made to enterprise
data sources.”
-- https://en.wikipedia.org/wiki/Change_data_capture
@nicolas_frankel
CDC implementation options
1. Polling + Timestamps on rows
2. Polling + Version numbers on rows
3. Polling + Status indicators on rows
4. Triggers on tables
5. Log scanners
-- https://en.wikipedia.org/wiki/Change_data_capture
@nicolas_frankel
“Turning the database inside out” - Martin Kleppman
-- https://www.confluent.io/blog/turning-the-database-inside-out-with-apache-samza/
@nicolas_frankel
What is a transaction/binary/etc. log?
“The binary log contains ‘events’ that
describe database changes such as table
creation operations or changes to table
data.”
-- https://dev.mysql.com/doc/refman/8.0/en/binary-log.html
@nicolas_frankel
Reasons for the log
1. Data recovery
2. Replication
@nicolas_frankel
What if we “hacked” the log?
@nicolas_frankel
Sample MySQL binlog
### UPDATE `test`.`t`
### WHERE
### @1=1 /* INT meta=0 nullable=0 is_null=0 */
### @2='apple' /* VARSTRING(20) meta=20 nullable=0 is_null=0 */
### @3=NULL /* VARSTRING(20) meta=0 nullable=1 is_null=1 */
### SET
### @1=1 /* INT meta=0 nullable=0 is_null=0 */
### @2='pear' /* VARSTRING(20) meta=20 nullable=0 is_null=0 */
### @3='2009:01:01' /* DATE meta=0 nullable=1 is_null=0 */
# at 569
#150112 21:40:14 server id 1 end_log_pos 617 CRC32 0xf134ad89
#Table_map: `test`.`t` mapped to number 251
# at 617
#150112 21:40:14 server id 1 end_log_pos 665 CRC32 0x87047106
#Delete_rows: table id 251 flags: STMT_END_F
@nicolas_frankel
Kind reminder…
 Implementation-dependent
 Fragile
 Who maintains/debugs it?
@nicolas_frankel
Debezium to the rescue
 Java-based abstraction layer for CDC
 Provided by Red Hat
 Apache v2 licensed
 Very skewed toward Kafka
@nicolas_frankel
Debezium connector plugins
 Production-ready
• MySQL
• PostrgreSQL
• MongoDB
• SQL Server
 Incubating
• Oracle
• DB2 (!)
• Cassandra
@nicolas_frankel
Debezium
“Debezium records all
row-level changes
within each database
table in a change
event stream”
-- https://debezium.io/
@nicolas_frankel
Hazelcast Jet
 Stream Processing Engine (SPE)
 Distributed
 In-memory
 Embeds Hazelcast IMDG
 Apache v2 licensed
 (Hazelcast Jet Enterprise offering)
@nicolas_frankel
Jet overview
Stream Processor
Data SinkData Source
Hazelcast IMDG
Map, Cache, List,
Change Events
Live Streams
Kafka, JMS,
Sensors, Feeds
Databases
JDBC, Relational,
NoSQL, Change Events
Files
HDFS, Flat Files,
Logs, File watcher
Applications
Sockets
Ingest
In-Memory
Operational Storage
Combine
Join, Enrich,
Group, Aggregate
Stream
Windowing, Event-Time
Processing
Compute
Distributed and Parallel
Computations
Transform
Filter, Clean,
Convert
Publish
In-Memory, Subscriber
Notifications
Stream Stream
@nicolas_frankel
Deployment modes
// Create new cluster member
JetInstance jet = Jet.newJetInstance();
// Connect to running cluster
JetInstance jet = Jet.newJetClient();
Client/ServerEmbedded
Java API
Application
Java API
Application
Java API
Application
Client API
Application
Client API
Application
Client API
Application
Client API
Application
@nicolas_frankel
Pipeline Job
 Declarative code that
defines and links sources,
transforms, and sinks
 Platform-specific SDK
 Client submits pipeline to
the SPE
 Running instance of pipeline
in SPE
 SPE executes the pipeline
• Code execution
• Data routing
• Flow control
@nicolas_frankel
Back to our use-case
A Jet job:
1. Watches change events in the
database
2. Analyzes the change event
3. Updates the cache accordingly
@nicolas_frankel
@nicolas_frankel
Recap
 The caching trade-off
 Event-based architectures FTW
 Change-Data-Capture
• Integration through Hazelcast Jet
@nicolas_frankel
Thanks for your attention!
 https://blog.frankel.ch/
 @nicolas_frankel
 https://jet-start.sh/docs/tutorials/cdc
 https://bit.ly/evergreen-cache

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