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Gerrit multi-master / multi-site at GerritHub

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Luca Milanesio
Luca Milanesio

GerritHub evolved from a simple master-slave setup into a truly multi-master and multi-site service. See how the solution has been implemented and the next steps for making the service even better and more distributed and scalable.

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0Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 0 Gerrit multi-master/site An open source solution with GerritHub Luca Milanesio Gerrit Code Review Maintainer GerritForge
1Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 1 About GerritForge Founded in the UK HQ in London Committed to OpenSource
2Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 2 GerritHub master – slave Hetzner – (GER) replication 2013 Incoming traffic
3Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 3 2013 Gerrit master (GER) Replication plugin Incoming traffic GerritHub master – slave
4Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 4 GerritHub master (+dr) – slave OVH – (CA) replication 2015 Incoming traffic Hetzner – (GER) replication
5Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 5 GerritHub master (+dr) – slave 2015 Gerrit master (CA) Replication plugin Gerrit master (GER) Incoming traffic
6Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 6 GerritHub multi-master (+dr) – slave OVH – (CA) replication 2017 Incoming traffic Hetzner – (GER) replication
7Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 7 GerritHub master (pri/dr) – slave 2017 Gerrit master (CA) Replication plugin Gerrit master (GER) Incoming traffic Gerrit master (CA) Replication plugin HAproxy HAproxy HAplugin HApluginShared NFS
8Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 8 GerritHub master (pri/dr) – slave components • Gerrit >= v2.14 + plugins • https://gerrit.googlesource.com/plugins/+ • replication • github • delete-project • account • high-availability (GerritForge’s fork) github.com/GerritForge/plugins_high_availability • websession-flatfile • scripting/groovy-provider
9Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 9 GerritHub multi-master/site – slave OVH – (CA) replication 2018 Incoming traffic (R/W) Hetzner – (GER) replication Incoming traffic (R)
10Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 10 GerritHub master (pri/dr) – slave 2018 Gerrit master (CA) Replication plugin R/W Traffic Gerrit master (CA) Replication plugin HAproxy HAproxy HAplugin HAplugin Gerrit master (GER) Replication plugin Gerrit master (GER) Replication plugin HAproxy HAproxy HAplugin HAplugin R Analytics Traffic Shared NFSShared NFS
11Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 11 GerritHub multi-master/site limitations 1.Lag in sites replication 2.Indexes aligned every 30 mins 3.Latency of disaster recovery (DNS)
12Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 12 Next steps: repositories sharding Gerrit master (CA) Replication plugin R/W Traffic Gerrit master (CA) Replication plugin HAproxy HAproxyHAplugin HAplugin HAproxy with repo-specific rules: • URL-based node selection Share-nothing between masters: • HA plugin to be tolerant do delays • Repo-specific replication configs Alignment checks and metrics
13Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 13 Next steps: auto-reindex across sites Gerrit master (CA) Replication plugin Gerrit master (CA) Replication plugin Multi-site plugin Multi-site plugin Reliable broker New multi-site plugin • Auto-reindex • Reliable across failures • Fully async
14Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 14 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
15Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 15 Poll: have you implemented multi-master/HA? Image from: http://cypp.rutgers.edu/ru-voting/political-information/public-opinion-polls/
16Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 16 Wants to know more? GerritForge.com/contact

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Gerrit multi-master / multi-site at GerritHub

  • 1. 0Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 0 Gerrit multi-master/site An open source solution with GerritHub Luca Milanesio Gerrit Code Review Maintainer GerritForge
  • 2. 1Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 1 About GerritForge Founded in the UK HQ in London Committed to OpenSource
  • 3. 2Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 2 GerritHub master – slave Hetzner – (GER) replication 2013 Incoming traffic
  • 4. 3Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 3 2013 Gerrit master (GER) Replication plugin Incoming traffic GerritHub master – slave
  • 5. 4Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 4 GerritHub master (+dr) – slave OVH – (CA) replication 2015 Incoming traffic Hetzner – (GER) replication
  • 6. 5Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 5 GerritHub master (+dr) – slave 2015 Gerrit master (CA) Replication plugin Gerrit master (GER) Incoming traffic
  • 7. 6Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 6 GerritHub multi-master (+dr) – slave OVH – (CA) replication 2017 Incoming traffic Hetzner – (GER) replication
  • 8. 7Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 7 GerritHub master (pri/dr) – slave 2017 Gerrit master (CA) Replication plugin Gerrit master (GER) Incoming traffic Gerrit master (CA) Replication plugin HAproxy HAproxy HAplugin HApluginShared NFS
  • 9. 8Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 8 GerritHub master (pri/dr) – slave components • Gerrit >= v2.14 + plugins • https://gerrit.googlesource.com/plugins/+ • replication • github • delete-project • account • high-availability (GerritForge’s fork) github.com/GerritForge/plugins_high_availability • websession-flatfile • scripting/groovy-provider
  • 10. 9Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 9 GerritHub multi-master/site – slave OVH – (CA) replication 2018 Incoming traffic (R/W) Hetzner – (GER) replication Incoming traffic (R)
  • 11. 10Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 10 GerritHub master (pri/dr) – slave 2018 Gerrit master (CA) Replication plugin R/W Traffic Gerrit master (CA) Replication plugin HAproxy HAproxy HAplugin HAplugin Gerrit master (GER) Replication plugin Gerrit master (GER) Replication plugin HAproxy HAproxy HAplugin HAplugin R Analytics Traffic Shared NFSShared NFS
  • 12. 11Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 11 GerritHub multi-master/site limitations 1.Lag in sites replication 2.Indexes aligned every 30 mins 3.Latency of disaster recovery (DNS)
  • 13. 12Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 12 Next steps: repositories sharding Gerrit master (CA) Replication plugin R/W Traffic Gerrit master (CA) Replication plugin HAproxy HAproxyHAplugin HAplugin HAproxy with repo-specific rules: • URL-based node selection Share-nothing between masters: • HA plugin to be tolerant do delays • Repo-specific replication configs Alignment checks and metrics
  • 14. 13Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 13 Next steps: auto-reindex across sites Gerrit master (CA) Replication plugin Gerrit master (CA) Replication plugin Multi-site plugin Multi-site plugin Reliable broker New multi-site plugin • Auto-reindex • Reliable across failures • Fully async
  • 15. 14Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 14 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
  • 16. 15Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 15 Poll: have you implemented multi-master/HA? Image from: http://cypp.rutgers.edu/ru-voting/political-information/public-opinion-polls/
  • 17. 16Gerrit User Summit 2018 – Palo Alto CA GerritForge.com 16 Wants to know more? GerritForge.com/contact