webinar: mongodb and polyglot persistence architecture

Polyglot Persistence

{ Name: ‘Bryan Reinero’,

Title: ‘Developer Advocate’,

Twitter: ‘@blimpyacht’,

Email: ‘[email protected]’ }

mailto:[email protected]

What is the Polyglots?

• Using multiple Database Technologies in a Given Application

• Using the right tool for the right job

What is the Polyglots?

• Using multiple Database Technologies in a Given Application

• Using the right tool for the right job

Derived from “polyglot programming”. Applications programmed from a mix of languages.

Why is the Polyglots?

• Relational has been the dominant model• Higher performance requirements• Increasingly large datasets• Use of IaaS and commodity hardware

Vertical Scaling

Horizontal Scaling

7

Availability

http://avstop.com/ac/flighttrainghandbook/imagel4b.jpg

8

Availability


Requirements• Maximize uptime• Minimize time to recover

9

Availability


Requirements• Maximize uptime• Minimize time to recover

Hardware failures

Network partitions

Data center failures

Maintenance Operations

10

Availability


Business critical systems require automatic fault detection and fail over

11

Variant Data Models

58842

45647

52320

88237

78932

Key-Value Store

Eratosthenes

Democritus

Hypatia

Shemp

Euripides

ID Name

12

Variant Data Models

Eratosthenes

Democritus

Hypatia

Shemp

Euripides

Graph Databases

13

Variant Data Models

Document Databases{

maker : ”Agusta",type : sportbike,rake : 7,trail : 3.93,engine : {

type : "internal combustion",layout : "inline"cylinders : 4,displacement : 750,

},transmission : {

type : "cassette",speeds : 6,pattern : "sequential”,ratios : [ 2.7, 1.94, 1.34, 1,

0.83, 0.64 ]}

}

The Goals of Normalization

• Model data an understandable form

• Reduce fact redundancy and data inconsistency

• Enforce integrity constraints

Polyglot Persistence

ApplicationServers MongoDB

RDBMS

Key / Value

Session Data, Shopping Carts

Product Catalog,User Accounts,Domain Objects

PaymentSystems,Reporting

GraphSocial Data,Recommendations

What are your requirements?

• Availability• Scalability• Performance• Access Patterns• Data Model

18

Key Value Stores

58842

45647

52320

88237

78932

Used for• Session data• Cookies• Shopping carts

Eratosthenes

Democritus

Hypatia

Shemp

Euripides

ID Name

19

Key Value Stores

58842

45647

52320

88237

78932

• Fast, if in memory• Single access pattern• Complex data parsed

in client

Eratosthenes

Democritus

Hypatia

Shemp

Euripides

ID Name

Key Value Store

“{maker : ‘Agusta’,type : sportbike,rake : 7,trail : 3.93,engine : {

type : ‘internal combustion’,layout : ‘inline’,cylinders : 4,displacement : 750,

},transmission : {

type : ‘cassette’,speeds : 6,pattern : ‘sequential’,ratios : [ 2.7, 1.94, 1.34, 1, 0.83, 0.64 ]

}}”

MongoDB

{ _id: 78234974,maker : ”Agusta",type : sportbike,rake : 7,trail : 3.93,engine : {


},transmission : {

type : "cassette",speeds : 6,pattern : "sequential”,ratios : [ 2.7, 1.94, 1.34, 1, 0.83, 0.64 ]

}}

Self Defining Schema

MongoDB



},transmission : {


}}

Self Defining SchemaNested Objects

MongoDB



},transmission : {


}}

Self Defining SchemaNested ObjectsArray types

MongoDB



},transmission : {


}}

Primary Key,Auto indexed

MongoDB



},transmission : {


}}

Secondaryindexes

MongoDB



},transmission : {


}}

Projectionsdb.vehicles.find ( {_id:78234974 }, { engine:1,_id:0 })

Data Model

RDBMS MongoDBTable, View ➜ CollectionRow ➜ DocumentIndex ➜ IndexJoin ➜ Embedded DocumentForeign Key ➜ ReferencePartition ➜ Shard

Flexible Schemas

{ maker : "M.V. Agusta",type : sportsbike,engine : {

type : ”internal combustion",

cylinders: 4,displacement : 750

},rake : 7,trail : 3.93

}{ maker : "M.V. Agusta",

type : Helicopterengine : {

type : "turboshaft"layout : "axial”,massflow : 1318

},Blades : 4undercarriage : "fixed"

}

Flexible Schemas

Discriminator column



cylinders: 4,displacement :

750},rake : 7,trail : 3.93



type : "turboshaft"

layout : "axial”,massflow : 1318


}

Flexible Schemas

Shared indexing strategy




750},rake : 7,trail : 3.93



type : "turboshaft"



}

Flexible Schemas

Polymorphic Attributes




750},rake : 7,trail : 3.93


type : Helicopter,engine : {

type : "turboshaft”,


},Blades : 4,undercarriage : "fixed"

}

Tao of MongoDB

• Model data for use, not storage• Avoid ad-hoc queries• Index effectively, index efficiently

Strong Consistency vs.

Eventual Consistency

Availability

Availablity

Fail-over

Strong vs. Eventual Consistency


Node A

Node B

Node C

Node E

Node D

Client 1

Client 2


Node A

Node B

Node C

Node E

Node D

Client 1

Client 2

Write


Node A

Node B

Node C

Node E

Node D

Client 1

Client 2

Read

Write


Node A

Node B

Node C

Node E

Node D

Client 1

Client 2

Write

Read

Analytics

45

Hadoop

A framework for distributed processing of large data sets• Terabyte and petabyte datasets• Data warehousing• Advanced analytics• Not a database• No indexes• Batch processing

46

Use Cases

• Behavioral analytics• Segmentation• Fraud detection• Prediction• Pricing analytics• Sales analytics

47

Data Management

HadoopOffline ProcessingAnalyticsData Warehousing

MongoDBOnline OperationsApplicationOperational

48

Typical Implementations

Application Server

49

MongoDB as an Operational Store

Application Server

50

Data Flows

HadoopConnector

BSON Files

MapReduce & HDFS

51

Cluster

MONGOS

SHARD A

SHARDB

SHARD C

SHARD D

MONGOS Client

53

Hadoop / Spark Trade-offs

Plus• Access to Analytics

Libraries• Processes unstructured

data• Handles petabyte data

sets

Minus• Overhead of a separate

distributed system• Writing MapReduce not

for the faint of heart• Designed for batch

oriented processing

54

Relational for Reporting & Business Intelligence

Plus• Existing ecosystem of BI

tools• Lower overhead than

Hadoop clusters• Large pool of expertise

and talent

RDBMSPrimary ETL

Oplog

Replication

Integrations & ETL

RDBMSPrimary

LucenePrimaryMongo

Connector

Oplog

Replication

Integrations with Search Solutions

Considerations

• Increased system complexity

• Operations overhead• Increased expertise

Thanks!

{ Name: ‘Bryan Reinero’,

Title: ‘Developer Advocate’,

Twitter: ‘@blimpyacht’,

Email: ‘[email protected]’ }

mailto:[email protected]

webinar: mongodb and polyglot persistence architecture

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