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Gerrit Code Review multi-site

Gerrit Code Review multi-site

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Last year we presented the vision and road-map of Gerrit multi-master setup at GerritHub.io. This year GerritForge and the Gerrit community have released the first version of the multi-site plugin, based on the legacy of the successful high-availability plugin started years ago by Ericsson.

The multi-site plugin is a 100% OpenSource solution and does not require any proprietary software installed or hardware/software level filesystem replication: it is fully based on the replication, healthcheck and multi-site plugins.

Multi-site is a journey and the Community is making big steps towards it.

Last year we presented the vision and road-map of Gerrit multi-master setup at GerritHub.io. This year GerritForge and the Gerrit community have released the first version of the multi-site plugin, based on the legacy of the successful high-availability plugin started years ago by Ericsson.

The multi-site plugin is a 100% OpenSource solution and does not require any proprietary software installed or hardware/software level filesystem replication: it is fully based on the replication, healthcheck and multi-site plugins.

Multi-site is a journey and the Community is making big steps towards it.

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Gerrit Code Review multi-site

  1. 1. 0Gerrit User Summit 2019 – Volvo Cars – Gothenburg - Sweden GerritForge.com 0 Gerrit goes multi-site … and is 100% open source Luca Milanesio Gerrit Code Review Maintainer GerritForge
  2. 2. 1Gerrit User Summit 2019 – Volvo Cars – Gothenburg - Sweden GerritForge.com 1 About GerritForge Founded in the UK HQ in London Committed to OpenSource
  3. 3. 2Gerrit User Summit 2019 – Volvo Cars – Gothenburg - Sweden GerritForge.com 2 The Journey to multi-site
  4. 4. 3Gerrit User Summit 2019 – Volvo Cars – Gothenburg - Sweden GerritForge.com 3 Single master Gerrit Master Incoming traffic
  5. 5. 4Gerrit User Summit 2019 – Volvo Cars – Gothenburg - Sweden GerritForge.com 4 Gerrit master Replication plugin Incoming traffic Gerrit master + slave
  6. 6. 5Gerrit User Summit 2019 – Volvo Cars – Gothenburg - Sweden GerritForge.com 5 Gerrit Master (+DR) + Slave Gerrit master Replication plugin Gerrit DR Incoming traffic
  7. 7. 6Gerrit User Summit 2019 – Volvo Cars – Gothenburg - Sweden GerritForge.com 6 Gerrit master (HA+DR) + Slave Gerrit master 1 Replication plugin Gerrit DR Incoming traffic Gerrit master 2 Replication plugin HAproxy HAproxy HAplugin HApluginShared NFS
  8. 8. 7Gerrit User Summit 2019 – Volvo Cars – Gothenburg - Sweden GerritForge.com 7 Gerrit master (HA+DR) + Slave: components • HAProxy • Gerrit >= v2.14 + plugins • https://gerrit.googlesource.com/plugins/+ • replication • high-availability (GerritForge’s fork) github.com/GerritForge/plugins_high_availability • websession-flatfile • healthcheck
  9. 9. 8Gerrit User Summit 2019 – Volvo Cars – Gothenburg - Sweden GerritForge.com 8 Gerrit multi-master – two-sites Gerrit master (CA) Replication plugin R/W Traffic Gerrit master (CA) Replication plugin HAproxy HAproxy Multi-site Multi-site Gerrit master (GER) Replication plugin Gerrit master (GER) Replication plugin HAproxy HAproxy Multi-site Multi-site R Analytics Traffic Shared NFSShared NFS
  10. 10. 9Gerrit User Summit 2019 – Volvo Cars – Gothenburg - Sweden GerritForge.com 9 (CA)(CA) Gerrit multi-master multi-site Gerrit masters (USA) Replication Gerrit masters (India) Replication Multi-site Multi-site Reliable broker ü Sync index and caches across sites ü Reliable across failures ü Fully async, max performance ü Fully distributed, max availability ü Eventually consistent across sites
  11. 11. 10Gerrit User Summit 2019 – Volvo Cars – Gothenburg - Sweden GerritForge.com 10 Gerrit multi-master multi-site Gerrit multi-site IS Highly Available Partition tolerant
  12. 12. 11Gerrit User Summit 2019 – Volvo Cars – Gothenburg - Sweden GerritForge.com 11 Split-brain prevention
  13. 13. 12Gerrit User Summit 2019 – Volvo Cars – Gothenburg - Sweden GerritForge.com 12 Ref-Db Coordinator • The Ref-Db coordinator is used to guarantee that two Gerrit instances do not go into a split-brain scenario • Reject any push where parent ObjectId is not aligned with the shared ref-db
  14. 14. 13Gerrit User Summit 2019 – Volvo Cars – Gothenburg - Sweden GerritForge.com 13 Next steps: location-aware DNS Gerrit master (CA) Rest of the World Traffic (R/W) Gerrit master (CA) HAproxy HAproxy Gerrit master (GER) Gerrit master (GER) HAproxy HAproxy EU Traffic (R/W) Multi-site pluginMulti-site pluginMulti-site pluginMulti-site plugin
  15. 15. 14Gerrit User Summit 2019 – Volvo Cars – Gothenburg - Sweden GerritForge.com 14 Poll: have you implemented multi-master/HA? Image from: http://cypp.rutgers.edu/ru-voting/political-information/public-opinion-polls/
  16. 16. 15Gerrit User Summit 2019 – Volvo Cars – Gothenburg - Sweden GerritForge.com 15 Wants to know more? GerritForge.com/contact

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