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Personalisering av
http://tv.nrk.no
Harald Schult Ulriksen
@hsulriksen
http://aurum.no
Utgangspunkt
Utgangspunkt
Bunntekst/Presentasjonstittel 7CC 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
API
Redis
Cache
Redis
Cache
API
Kø
Datasenter 1
Datasenter 2
Kø
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 DocumentDb
Request units
S2
S1
S0 250
1000 + 1000 + 1000 + 1000 + 1000 + 1000 = 6000
Request units
S0 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 Data
Plo Hashset ProgramId Program list item
sp_{seriesId} Set ProgramIds
uf_{userId} Hashset ProgramId Serialized data
usf_{userId} SortedSet Unix epoch date added ProgramId
uh_{userId} Hashset ProgramId Serialized data
ush_{userId} SortedSet Unix epoch, last
watched
ProgramId
User loaded ul_{userId} Bool
User last write time uw_{userId} Date time
Script to load user data
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Personalisering av tv.nrk.no

Editor's Notes

  1. Hva er personalisering for NRK. Favoritter, mine programmer. Analyse, kobles til innholdsplakat.
  2. 20-40K API requests / minutt Median 13-15ms 95 persentil 150-200ms 99 persentil 600-800ms TV, Radio og Klipp. Read only
  3. Ingen «kontroll» på når data endres. Web, App,
  4. 100K samtidige seere on-demand Oppdateringsfrekvens Play start, delayed Hvert 2 minutt Pause Onbeforeunload Program slutt ca 55K request / minutt Separate API kall / Resources Berikelse av eksisterende kall Mengden data øker over tid, hvem er master.
  5. Presentasjon av personaliserte data Synkronisering mellom to datasentre Caching Skalering 8 fallacies of distributed computing The network is reliable. Latency is zero. Bandwidth is infinite. The network is secure. Topology doesn't change. There is one administrator. Transport cost is zero. The network is homogeneous.
  6. Command Query Responsibility Segregation Naturlig med forskjellig skriveløp, gir mulighet å skalere de to individuelt.
  7. Queue based load leveling
  8. Ujevn ytelse
  9. Competing consumers. - mulighet å øke ytelsen på skrivelaget ved behov. Reliability, feiler en så fortsetter resten. En treg melding vil ikke forstyrre resten.
  10. Publish subscribe – fra observer. Her melding dupliseres og behandles individuelt.
  11. Content based router - filtrering
  12. Command Query Responsibility Segregation Naturlig med forskjellig skriveløp, gir mulighet å skalere de to individuelt.
  13. Partitioning component of Amazon's storage system Dynamo[4][5] Data partitioning in Apache Cassandra[6] Data Partitioning in Voldemort[7] Akka's consistent hashing router[8]
  14. Forbedringer: Egen kø hvis noe må sendes på nytt for en worker, topic sender alltid alt til alle. Cassandra – data senter aware storage. Eventhub -> Stream analytics – multiple datacenter