Advanced Concept of Caching - Mathilde Lemee - Codemotion Milan 2014

Mathilde Lemee

Advanced Concept of Caching

@MathildeLemee - Aetys

MILAN november 28th/29th 2014

HIT#codemotion @MathildeLemee

MISS

#codemotion @MathildeLemee

TTITTL


Tom wants to improve data

access #codemotion @MathildeLemee

CACHE ASIDE

Database

Application

Cache

DAO

HIT !Get A MISS !Get B

Read B

PUT !Put B HIT !Get B


Tom wants that the cache always have

updated datas.


System of

Record#codemotion @MathildeLemee

Cache as a s-o-r : Read through

Database

Application

Ehcache

Persistence layer

Get A

HIT !


Cache as a s-o-r : Read through

Database

Application

Ehcache

Persistence layer

Get AMISS!


Cache as a s-o-r : Write through

Database

Application

Ehcache

Persistence layer

PUT !


Tom works on a e-commerce website and want to have the faster data access.


Cache as a s-o-r : Write Behind

Database

Application

Ehcache

Persistence layer

PUT !Put A

Write-behind thread

APUT !Put B

BPUT !Put C

CPUT !Put D

D

Get A B C D

Write A B C D


AccessTime


Write Through Response times


Write Behind Response Times


Database


Write Through – Database load


Write Behind – Database load


Tom doesn't control the

datas#codemotion @MathildeLemee

REFRESH AHEAD


TTLTTR0


Paul work in a bank where at a fixed time datas

are updated#codemotion @MathildeLemee

SCHEDULEDREFRESH

AHEAD#codemotion @MathildeLemee

Choose#codemotion @MathildeLemee

CACHE ASIDE VS

READ/WRITE THROUGH


Refresh Ahead/Scheduled

Refresh VS

The world#codemotion @MathildeLemee

Refresh AheadVS

Scheduled Refresh Ahead


Write Behind VS

Write Through#codemotion @MathildeLemee

KNOW YOUR

DATAS#codemotion @MathildeLemee

CACHE


CACHE#codemotion @MathildeLemee

CACHE


Wikipedia

La scalabilité est la capacité qu’a

l’architecture pour

évoluer en cas de montée en

charge si nécessaire.


La scalabilité d’une

application est égale à la

scalabilité de son composant

le moins scalable.


DISTRIBUTION#codemotion @MathildeLemee

ET SI …#codemotion @MathildeLemee

5#codemotion @MathildeLemee

ET QUAND

• Julie / 32 ans / 2 enfants / Paris• Paul / 27 ans / 4 enfants / Marseille• Thomas / 40 ans / 1 enfant / Paris

– Déménagement de Thomas sur Marseille

Qui habite sur Paris ?

Consistence


Two Phase Commit

LOCAL QUORUM

ONE

TWO

THREE

QUORUM

ANYEACH QUORUM


CAP

• Consistency :• Availability : • Partionning


• Consistency + Available = RDBMS• Consistency + Partionning = BigTable / Hbase /

MongoDB / Redis• Available + Partionning =

Riak/Cassandra/CouchDB


Data Grid

Big

Data

For who ?

Key Value store

IMDG

vs

Relational Database

IMDG

vs

NoSQL

And after ?

Advanced Concept of Caching - Mathilde Lemee - Codemotion Milan 2014

Technology

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