1. World’s Best Data Modeling Tool
for Apache Cassandra
1© 2015. All Rights Reserved.
Artem ChebotkoAndrey Kashlev

2. 1 Cassandra Data Modeling Methodology
2 The KDM Tool
3 Live Demo: IoT
4 Live Demo: Media Cataloguing
5 Future Work
2© 2015. All Rights Reserved.

3. Data Modeling Process
• Data requirements
• Application requirements
• Schema Design
• Optimization
3© 2015. All Rights Reserved.

4. Cassandra Data Modeling Methodology
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Conceptual
Data Model
Application
Workflow
Logical
Data Model
Physical
Data Model
Mapping Optimization

5. Methodology Models
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Model Representation
Conceptual Data Model ERD
Application Workflow Model Graph
Logical Data Model Chebotko Diagram
Physical Data Model Chebotko Diagram, CQL

6. Methodology Protocols
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• Conceptual-to-logical mapping
– Mapping rules
– Mapping patterns
• Physical optimizations
– Partition size analysis
– Duplication factor analysis
– Keys, aggregation, transactions, …

7. Example
© 2015. All Rights Reserved. 7
SELECT timestamp, value FROM …
WHERE location = ? AND parameter = ? AND timestamp > ?
ORDER BY timestamp DESC
n
parameter value
1
timestampid location
Sensor Measurementrecords

8. sensor_data
location K
parameter K
timestamp C↓
id C↑
value
1
Example
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SELECT timestamp, value FROM …
WHERE location = ? AND parameter = ?
AND timestamp > ?
ORDER BY timestamp DESC
n
parameter value
1
timestampid location
Sensor Measurementrecords
Mapping Entity and Relationship Types

9. sensor_data
location K
parameter K
timestamp C↓
id C↑
value
sensor_data
location K
parameter K
timestamp C↓
id C↑
value
1 2
Example
© 2015. All Rights Reserved. 9
SELECT timestamp, value FROM …
WHERE location = ? AND parameter = ?
AND timestamp > ?
ORDER BY timestamp DESC
n
parameter value
1
timestampid location
Sensor Measurementrecords
Mapping Equality Search Atributes

10. sensor_data
location K
parameter K
timestamp C↓
id C↑
value
sensor_data
location K
parameter K
timestamp C↓
id C↑
value
sensor_data
location K
parameter K
timestamp C↑
id C↑
value
1 2 3
Example
© 2015. All Rights Reserved. 10
SELECT timestamp, value FROM …
WHERE location = ? AND parameter = ?
AND timestamp > ?
ORDER BY timestamp DESC
n
parameter value
1
timestampid location
Sensor Measurementrecords
Mapping Inequality Search Attributes

11. sensor_data
location K
parameter K
timestamp C↓
id C↑
value
sensor_data
location K
parameter K
timestamp C↓
id C↑
value
sensor_data
location K
parameter K
timestamp C↑
id C↑
value
sensor_data
location K
parameter K
timestamp C↓
id C↑
value
1 2 3 4
Example
© 2015. All Rights Reserved. 11
SELECT timestamp, value FROM …
WHERE location = ? AND parameter = ?
AND timestamp > ?
ORDER BY timestamp DESC
n
parameter value
1
timestampid location
Sensor Measurementrecords
Mapping Ordering Attributes

12. sensor_data
location K
parameter K
timestamp C↓
id C↑
value
sensor_data
location K
parameter K
timestamp C↓
id C↑
value
sensor_data
location K
parameter K
timestamp C↓
id C↑
value
sensor_data
location K
parameter K
timestamp C↑
id C↑
value
sensor_data
location K
parameter K
timestamp C↓
id C↑
value
1 2 3 4 5
Example
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SELECT timestamp, value FROM …
WHERE location = ? AND parameter = ?
AND timestamp > ?
ORDER BY timestamp DESC
n
parameter value
1
timestampid location
Sensor Measurementrecords
Mapping Key Attributes

13. Methodology Pros and Cons
Correctness
Completeness
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Complexity
Time investment

14. Human Errors Happen …
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15. Automation
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Complexity
Time investment
Human Error

16. 1 Cassandra Data Modeling Methodology
2 The KDM Tool
3 Live Demo: IoT
4 Live Demo: Media Cataloguing
5 Future Work
16© 2015. All Rights Reserved.

17. The KDM Tool
• Streamlines the methodology
• Guides the user
• Automates data modeling tasks:
– Conceptual-to-logical mapping
– Physical optimization
– CQL generation
17© 2015. All Rights Reserved.

18. KDM Automation Workflow
18© 2015. All Rights Reserved.

19. KDM Automation Workflow
19© 2015. All Rights Reserved.
Design
Conceptual
Data Model
Step1
Solution
architect

20. KDM Automation Workflow
20© 2015. All Rights Reserved.
Design
Conceptual
Data Model
Specify
Access
Patterns
Solution
architect
Step1 Step2
Solution
architect

21. KDM Automation Workflow
21© 2015. All Rights Reserved.
Design
Conceptual
Data Model
Specify
Access
Patterns
Generate
Logical
Data
Models
KDM
Solution
architect
Step1 Step2 Automated
Solution
architect

22. KDM Automation Workflow
22© 2015. All Rights Reserved.
Design
Conceptual
Data Model
Specify
Access
Patterns
Generate
Logical
Data
Models
Select
Logical
Data
Model
KDM
Solution
architect
Step1 Step2 Step3Automated
Solution
architect
Solution
architect

23. KDM Automation Workflow
23© 2015. All Rights Reserved.
Design
Conceptual
Data Model
Specify
Access
Patterns
Generate
Logical
Data
Models
Select
Logical
Data
Model
Generate
Physical
Data
Model
KDM
Solution
architect
Step1 Step2 Step3Automated Automated
Solution
architect
Solution
architect
KDM

24. KDM Automation Workflow
24© 2015. All Rights Reserved.
Design
Conceptual
Data Model
Specify
Access
Patterns
Generate
Logical
Data
Models
Select
Logical
Data
Model
Generate
Physical
Data
Model
Configure
Physical
Data
Model
KDM
Solution
architect
Step1 Step2 Step3 Step4Automated Automated
Solution
architect
Solution
architect
Solution
architect
KDM

25. KDM Automation Workflow
25© 2015. All Rights Reserved.
Design
Conceptual
Data Model
Specify
Access
Patterns
Generate
Logical
Data
Models
Select
Logical
Data
Model
Generate
Physical
Data
Model
Configure
Physical
Data
Model
Generate
Physical
Schema
KDM
Solution
architect
Step1 Step2 Step3 Step4Automated Automated Automated
Solution
architect
Solution
architect
Solution
architect
KDM KDM

26. KDM Automation Workflow
26© 2015. All Rights Reserved.
Design
Conceptual
Data Model
Specify
Access
Patterns
Generate
Logical
Data
Models
Select
Logical
Data
Model
Generate
Physical
Data
Model
Configure
Physical
Data
Model
Generate
Physical
Schema
Download
CQL
Script
KDM
Solution
architect
Step1 Step2 Step3 Step4 Step5Automated Automated Automated
Solution
architect
Solution
architect
Solution
architect
Solution
architect
KDM KDM

27. 1 Cassandra Data Modeling Methodology
2 The KDM Tool
3 Live Demo: IoT
4 Live Demo: Media Cataloguing
5 Future Work
27© 2015. All Rights Reserved.

28. 28

29. 29
given
find
Q1.

30. 30
Q1.
Q2.
given
given
range
find
find and
sort DESC
given

31. 31
Q1.
Q2.
Q3.
given
find and
sort DESC
given
find

32. 1 Cassandra Data Modeling Methodology
2 The KDM Tool
3 Live Demo: IoT
4 Live Demo: Media Cataloguing
5 Future Work
32© 2015. All Rights Reserved.

33. © 2015. All Rights Reserved. 33

34. 34© 2015. All Rights Reserved.
• KDM:
– automates most complex tasks
– eliminates human error
– simplifies data modeling
– guides
Summary

35. 35© 2015. All Rights Reserved.
• build new data models
• verify existing data models
• teach/learn data modeling
How Can KDM Help You?

36. 1 Cassandra Data Modeling Methodology
2 The KDM Tool
3 Live Demo: IoT
4 Live Demo: Media Cataloguing
5 Future Work
36© 2015. All Rights Reserved.

37. Future Work
• Materialized views
• User Defined Types
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38. Future Work
• Analysis and physical optimization
• Support for application workflow design
• Support for Chebotko Diagrams
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39. Acknowledgements
• Andrey Kashlev would like to thank:
– Dr. Shiyong Lu
– Anthony Piazza
• Artem Chebotko would like to thank:
– Anthony Piazza
– Patrick McFadin
– Jonathan Ellis
– Tim Berglund
© 2015. All Rights Reserved. 39

40. Thank you