Personalisering av http://tv.nrk.no

Harald Schult Ulriksen@hsulriksen

http://aurum.no

Utgangspunkt

Utgangspunkt

Bunntekst/Presentasjonstittel 7

Klikk ikonet for å legge til et bilde

CC BY Gemma Longman

Ytelse Oppetid Tilstand Sikkerhet

Kø

Kø

Kø

Topic

Subscription A

Subscription B

Topic

V2

West Europe v1

West Europe v2

North Europe V2

North Europe V1

WorkerRole

WorkerRole

WorkerRole

WorkerRole

Patterns• Command Query Responsibility Segregation• Queue-based Load Leveling• Competing consumers• Publish subscribe channel• Content based router• Deadletter• Message store

APIRedis Cache

Redis CacheAPI

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Datasenter 1

Datasenter 2

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Datasenter 1

Datasenter 2

Kø leser

DocumentDb

Kø leser

DocumentDb

Datasenter 1 Datasenter 2

1

3

2

1

2

1

1

1

2

3

DocumentDb

Scaling DocumentDbRequest units

S2

S1

S0 2501000 + 1000 + 1000 + 1000 + 1000 + 1000

= 6000

Request unitsS0 250 kr 177,00 S1 1000 kr 353,00 S2 2500 kr 706,00

Sekunder mellom hver ping S1 RU's 1000 120,00 Antall 10,00 kr 3 530,00

API klienter Request pr. minutt Pr. sekund MS pr melding RU's needed RU's total RU Balance 100 000,00 50 000,00 833,33 1,20 10 791,67 10 000,00 -791,67 50 000,00 25 000,00 416,67 2,40 5 395,83 10 000,00 4 604,17 20 000,00 10 000,00 166,67 6,00 2 158,33 10 000,00 7 841,67 10 000,00 5 000,00 83,33 12,00 1 079,17 10 000,00 8 920,83

Request charge

Save recently watched Document lookup 2,28 Replace existing 10,67 Total 12,95

Redis cache structure

Name Type Key / Score DataPlo Hashset ProgramId Program list itemsp_{seriesId} Set ProgramIdsuf_{userId} Hashset ProgramId Serialized datausf_{userId} SortedSet Unix epoch date added ProgramId

uh_{userId} Hashset ProgramId Serialized dataush_{userId} SortedSet Unix epoch, last

watchedProgramId

User loaded ul_{userId} BoolUser last write time uw_{userId} Date time

Script to load user data