Speaker: Gaurav Goyal, Sr IT Architect, Cisco Systems Inc Speaker: Dharmesh Panchmatia, Director, Cisco Systems Inc Level: 200 (Intermediate) Track: RDBMS to MongoDB Cisco’s e-commerce platform is a suite of 35 different applications and 300+ services that powers product configuration, pricing, quoting, and order booking across all Cisco product lines including hardware, software, services and subscriptions. It’s a B2B platform used by Cisco Sales Team, Partners and Direct Customers, serving 140,000 unique users across the globe, handling 4 million transactions per day. The Benefits of migrating to MongoDB were as follows: 1) 5x performance improvement, 2) Fault tolerant architecture, 3) Continuous deployments and upgrades with zero downtime, 4) Faster application development. What You Will Learn: - How to transform your e-commerce platform to enable cloud native architecture. - Bulk data migration in real time between relational databases & MongoDB. - Best practices for brownfield migration for mission critical systems.

1. Dharmesh Panchmatia, Director IT, Gaurav Goyal, Architect IT
Transforming a Large Mission-
Critical E-Commerce Platform from a
Relational Architecture to MongoDB

2. 1
How to transform your e-commerce platform to enable
cloud native architecture
2
Best practices for migrating an e-commerce application
platform from relational to MongoDB
3
Planning considerations for data migration from
relational to MongoDB
Learning Objectives

3. Cisco Commerce Overview

4. Caching/
Security
Cisco Commerce
(New, Follow-on and Renewal)
Delivery
Platform
User
Experience
Customer
Experience
Web Mobile
(iOS, Android)
B2B
(Web Services, EDI/XML, Punch-outs)
Data Center /
Virtualization
Richardson (DC1) – UCS-B200 M2
Web, App Server – Active, DB – Active
Allen (DC2) – UCS-B200 M2
Web, App Server – Active, DB – Passive*MVDC
Capabilities
Integrated
Capabilities/
Workflow
MDM, Services,
Biz Rules
& Policies
Config
Engine
Deal
Routing
Rules
Party
Service
Pricing
Engine
Eligibility
Service
Offer
Mgmt
Notification
Engine
Akamai Caching Services
RealUserExperience/AppPerformanceMgmt
(AppDynamics,Akamai,ELK)
Oracle Access Manager / Oauth
Security/
Caching
Event Management Framework
Configure Price Quote
Deal
Approval
Order
Capture
Order
Orchestration
Cisco Commerce Architecture

5. 40+B Order
Bookings
4-6M
Hits per Day
140K
Unique Users
Cisco Commerce by the Numbers
300+
Services
36
Applications
4M
Lines of Code

6. Pain Points
10-12 hour
downtimes for
code
Lack of agility due
to monolithic code
base
6+ month
effort for major
software
upgrades
Multiple platform
outages due to
infrastructure, storage
and network failures
1 32 4

7. Journey to Cloud Native

8. 1 2 3 4
Zero downtime for
software upgrades
and code
deployments
Increased Agility -
move towards API
based Architecture
5X performance
improvement &
scalability
Fault tolerance for
high application
availability
Objectives

9. Ref Data
REFERENCE DATA SOURCE
DMPRD - RDBMS
Logging
Order Capture
DC1 - Tomcat
Order Capture
Addresses Items
Preferences
Roles
Contacts Logging
DC1 & DC2
Transaction
Data
Transaction
sync
Downstream
Publish
X-Functional
Services (73)
DC3DC2DC1
TRANSACTION DATA STORE
P S S S S
N1 N2 N3 N4 N5
DC2 - Tomcat
1 2
3
4
5
Journey to Cloud Native

10. Changed 110 backend integrations to Rest API calls
X-Functional
Dependencies
7 months without additional head count
Delivery
TimeLine
Delivering 26 Biz capabilities (10H, 7 M, 9 L) along with this changeBrownfield
Rewrote 120 K lines of back-end code;
Touched 600k lines of existing java code
Code
Risk Mitigation
• Backward Compatibility
• Extensive shadow testing for B2B Orders
• Phase rollout
Migration by the Numbers

11. • Migrate all reference data to Elastic Search
• Build APIs to leverage reference data
3. Reference Data
• MongoDB primary database for transactions
• Rewrite SQL code in middle tier (~800,000 lines of code )
4. Transaction Data
• Feature flag based approach to switch to RDBMS in case
of issues
• Phase rollout to mitigate functional parity risk
6. Backward Compatibility
1.Zero Downtime Deployment
• Leverage Blue-Green deployment to deploy front end /
middle tier code
• Use Consul as Service Registry
2. Decouple dependency
on other systems
• Migrate from DB access to APIs
• Influence other systems to provide fault tolerant APIs
• Leverage Kafka for publishing data to downstream systems5. Downstream Publish
Cloud Native Design Cookbook

12. Completed three
quarters without
issues
Software
Upgrades in
minutes without
downtime
Zero Downtime
Response Times
reduced to sub-
sec from 3-5 sec
earlier
5x Performance
Improvement
Eliminated
~120,000 lines
of BE code
Architecture
Optimization
Benefits & Post Go-Live Status
7+ infrastructure
outages since go live,
no business impact
Multiple upgrades
without any downtime
Fault Tolerance

13. Best Practices

14. Data Model
Error Order
Order
Ext
Financial
Summary
Shipping
Group
Line Contact Payment TaxDtls
Smart
Account
Line Trx
Info
Line
Details
Line
Pricing
Price
Adj
Line
TFS
Details
Child Tables
Order
Child Tables
RDBMS
Tables: 14
Indexes: 60
Sequences: 16
Mongo DB
Tables: 1
Indexes: 7
Sequences: 6

15. MongoDB
Collection
{ "_id" : "orderIdSeq",
"seqValue" : 0,
"cache" : NumberInt(100) }
JVM 1 JVM 2 JVM 3 JVM 4
0-100 101-200 201-300 301-400
backend seqValue = 400
cache
x 500
findAndModify ( )
1. lock that particular record,
2. increment the sequence,
3. return the value,
4. unlock it.
401-500
Custom Sequence

16.  Denormalize schema
 Optimize Docment Size
 Keep # of indexes to less than 20
 Minimize # of sequences
 Cache sequences in the middle tier
Schema Definition
 Complete data migration before query
optimization
 Use projections
 Update only changed apptributes
 Use WriteConcern: 2 / majoirty,
ReadPreference: Primary Preferred
 Avoid complex queries in MongoDB
Query Optimization
Best Practices

17.  Authentication & Authorization a must
 Change passwords every 6 months
 Encrypt sensitive data
 Define Read/Write and Read Only user
roles
 Leverage 3rd data center for all adhoc
queries
Security
 Setup alerts in Ops Manager
 Use Ops Manager for backups &
upgrades
 Print queries taking more than Xms.
Ops Manager
Best Practices

18. Ops Manager is must for
mission critical apps.
Keep an eye on Headroom
during bulk data migration.
Lessons Learned
SAN/SSD is a must
Subscribe to MongoDB bug
advisory & have frequent
upgrades
Most of the performance issues arises
because of missing or wrong indexes.
Create indexes in
background after bulk
data migration
MongoDB provides ACID
properties at document level
v/s transaction.
WriteConcern: majority for
critical transactions
Lessons
Learned

19. RDBMS to MongoDB Data Migration

20. DATA
MIGRATION
TO DB
DATA
MIGRATION
TO MONGO
ON USERS
REQUEST
SYNC
MAPPING EVENT
ONE TIME REAL TIME SYNC SCHEDULED
POLLING
CONTINUOUS
SYNC
RESTRICTED
MODE
RDBMS
BACKEND
BASED
WEB SERVICE
BASED
POLLING
BASED
MONGO
DB
POLL ON
INTERVAL
BASIS
DATA
MIGRATION
TO DB
R2M M2R
R2M M2R
R2M
R2M M2R
R2M: RDBMS to MongoDB
M2R: MongoDB to RDBMS

21. DEMO
https://github.com/gagoyal01/mongodb-rdbms-sync

22. 1
How to transform your e-commerce platform to enable
cloud native architecture
2
Best practices for migrating an e-commerce application
platform from relational to MongoDB
3
Planning considerations for data migration from
relational to MongoDB
Learning Objectives

23. Questions and Answers