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#GerritUserSummit
Zero Downtime Gerrit
How to upgrade your Gerrit master while keeping the balls rolling.
Luca Milanesio
luca@gerritforge.com
@gitenterprise @gerritreview #GerritUserSummit
• Founded in the UK
• HQ in London, Offices in the UK and Italy
• Committed to OpenSource
About GerritForge
@gitenterprise @gerritreview #GerritUserSummit
• Co-founder and Director of
GerritForge
• over 20 years in Agile
Development and ALM
• Contributor to many OpenSource
projects
• Mind and hands of @gitenterprise
and @gerritreview Twitter feeds
About Luca Milanesio
@gitenterprise @gerritreview #GerritUserSummit
Life outside Google Data-Centers
• Gerrit is quite stable
• GerritHub uptime to date: 226 days
• Extensive unit & integration tests suite
@gitenterprise @gerritreview #GerritUserSummit
Life outside Google Data-Centers
BUT
@gitenterprise @gerritreview #GerritUserSummit
Life outside Google Data-Centers
"Sometimes" we need to upgrade
– Feb 2 gerrit-2.11.6
– Feb 12 gerrit-2.11.7
– Mar 3 gerrit-2.12.1
– Mar 9 gerrit-2.11.8
– Mar 11 gerrit-2.12.2
– May 17 gerrit-2.11.9
– Jul 7 gerrit-2.12.3
– Aug 24 gerrit-2.12.4
– Aug 26 gerrit-2.11.10
– Sep 24 gerrit-2.12.5
– Oct 21 gerrit-2.13
– Oct 21 gerrit-2.13.1
– Oct 21 gerrit-2.13.2
@gitenterprise @gerritreview #GerritUserSummit
Life outside Google Data-Centers
How others are
managing
upgrades 
@gitenterprise @gerritreview #GerritUserSummit
Life outside Google Data-Centers
Three flavors up upgrades
1. Code-only : Typically patch-releases
2. Code + DB Schema upgrade: Major releases
3. Code + DB Schema upgrade + Repos upgrade: Painful Major
release
@gitenterprise @gerritreview #GerritUserSummit
Life outside Google Data-Centers
How Google is
managing
upgrades 
@gitenterprise @gerritreview #GerritUserSummit
Life outside Google Data-Centers
Level of pain in the OpenSource Gerrit implementations
1. Code-only
 5 mins of fear
2. Code + DB Schema upgrade
 1/2 days of planning + 15/20' outage
3. Code + DB Schema upgrade + Repos upgrade:
 1/2 months of planning + leap of faith
@gitenterprise @gerritreview #GerritUserSummit
Levels of Zero-Downtime
0. Outage
1. Server always-on and reachable
2. Gerrit UX visible and responsive
3. Git/HTTP and Git/SSH accessible
4. Most of the functions operational
5. All functions fully operational
@gitenterprise @gerritreview #GerritUserSummit
Levels of Zero-Downtime: where are we?
0. Outage
1. Server always-on and reachable
2. Gerrit UX visible and responsive
3. Git/HTTP and Git/SSH accessible
4. Most of the functions operational
5. All functions fully operational
@gitenterprise @gerritreview #GerritUserSummit
HA Proxy
Zero-Downtime Upgrade – Stage 1
Client traffic
Ver. X (empty)
RSync
DB Export / Import
@gitenterprise @gerritreview #GerritUserSummit
HA Proxy
Zero-Downtime Upgrade – Stage 2
Client traffic
Ver. X Ver. X
Gerrit replication
@gitenterprise @gerritreview #GerritUserSummit
HA Proxy
Zero-Downtime Upgrade – Stage 3 upgrade
Client traffic
Ver. X Ver. X + N
Upgrade Gerrit war to Ver. X+N
Init + Off-line reindex
@gitenterprise @gerritreview #GerritUserSummit
HA Proxy
Zero-Downtime Upgrade – Stage 4 – read-only
Client traffic
Ver. X Ver. X + N
Install Read-only plugin
@gitenterprise @gerritreview #GerritUserSummit
HA Proxy
Zero-Downtime Upgrade – Stage 5 – delta replication
Client traffic
Ver. X Ver. X + N
Install Read-only plugin
Delta replication
DB Export / Re-Import
@gitenterprise @gerritreview #GerritUserSummit
HA Proxy
Zero-Downtime Upgrade – Stage 6 – Reinit
Client traffic
Ver. X Ver. X + N
READ-ONLY Init + Startup
@gitenterprise @gerritreview #GerritUserSummit
HA Proxy
Zero-Downtime Upgrade – Stage 7 – delta reindex
Client traffic
Ver. X Ver. X + N
Delta reindexREAD-ONLY
@gitenterprise @gerritreview #GerritUserSummit
HA Proxy
Zero-Downtime Upgrade – Stage 8 – traffic redirect
Client traffic
Ver. X Ver. X + N
Cache warm-up
@gitenterprise @gerritreview #GerritUserSummit
Timing and service level
1Stages 2 3 4 5 6 7
Times: days hours 10s 5' 5' 1s
Service
Level 100% up on Ver. X Read-only Ver. X 100% up on Ver. X + N
8
@gitenterprise @gerritreview #GerritUserSummit
DEMO
@gitenterprise @gerritreview #GerritUserSummit
Wants to know more?
www.gerritforge.com/contact

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