Luca Milanesio from GerritForge gave a presentation on the new features in Gerrit 3.0 and beyond. Some of the key highlights included: - PolyGerrit is the new Gerrit UI built without GWT for improved performance and customization. - NoteDb stores all Gerrit data including commits, reviews, metadata, accounts and groups directly in Git for fully consistent backups and removal of single point of failure databases. - Submit rules can now be written in any language through an extension point beyond just Prolog. - New core plugins like Gitiles, delete project, and web hooks have been added with a plugin manager for easy installation. - Future releases will

1. 0Gerrit User Summit 2019 – Volvo Cars – Gothenburg - Sweden GerritForge.com 0
What’s new in Gerrit 3.0
… and beyond
Luca Milanesio
Gerrit Code Review Maintainer
GerritForge

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. 2Gerrit User Summit 2019 – Volvo Cars – Gothenburg - Sweden GerritForge.com 2
New features PolyGerrit is THE Gerrit UI
GWT is gone
FOREVER

4. 3Gerrit User Summit 2019 – Volvo Cars – Gothenburg - Sweden GerritForge.com 3
PolyGerrit in-line Edit
Codemirror
Syntax highlight

5. 4Gerrit User Summit 2019 – Volvo Cars – Gothenburg - Sweden GerritForge.com 4
PolyGerrit goodies
Dark Mode
Custom Themes

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PolyGerrit Mobile / Tablet view
Fluid Layout

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PolyGerrit JavaScript plugins (e.g. Checks)
UI
extension
points for
plugins

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PolyGerrit out of the box experience
First steps
Help for new
users

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Notedb happened
NoteDB = NO(te) DB

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The journey to v3.0
Dave Borowitz – Gerrit User Summit 2017

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The journey to v3.0
Dave Borowitz – Gerrit User Summit 2017
Gerrit 2.16
Gerrit 3.0
2019

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Migration path v3.0
• v2.14 / ReviewDb
• v2.15 / ReviewDb
• v2.16 / ReviewDb
• v2.16 / NoteDb
•v3.0
https://www.workeastren.co.uk/case-studies/paul-steps-to-success-case-study/

13. 12Gerrit User Summit 2019 – Volvo Cars – Gothenburg - Sweden GerritForge.com 12
NoteDb the most innovative feature of Gerrit
Commits + Reviews + Meta-data
Accounts + Groups
è ALL stored in Git

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NoteDb fully consistent backups
Online backups
100% consistency

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NoteDb remove single-point-of-failure
ONE LESS
point of failure (DBMS)

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NoteDb on-line migrations
NO MORE Schema Migration
zero-downtime upgrade

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NoteDb disaster recovery
Replication
to DR site
of ALL Gerrit data

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NoteDb full audit and compliance
Account history
Groups history
Review history
ALL in Git repo as JSON

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NoteDb full security
ALL objects protected
with uniform ACLs
And Group-based access

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NoteDb allow data insight and analytics
Expose ALL reviews
Data as JSON
for analytics

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NoteDb increased performance and low latency
Read code and reviews
In the same JGit access
and cache

22. 21Gerrit User Summit 2019 – Volvo Cars – Gothenburg - Sweden GerritForge.com 21
NoteDb example
$ git fetch origin refs/changes/95/218095/meta && git log -p FETCH_HEAD
commit ac3c2780a9737356e3a494f772570608ca5fb66b
Author: Gerrit User 1006192 <1006192@173816e5-2b9a-37c3-8a2e-48639d4f1153>
Date: Mon Mar 18 17:54:15 2019 +0000
Update patch set 1
Change has been successfully merged by Luca Milanesio
Patch-set: 1
Status: merged
Tag: autogenerated:gerrit:merged
Reviewer: Gerrit User 1006192 <1006192@173816e5-2b9a-37c3-8a2e-48639d4f1153>
Label: SUBM=+1
Submission-id: 18095-1552931655231-726b23a
Submitted-with: OK
Submitted-with: OK: Verified: Gerrit User 1006192 <1006192@173816e5-2b9a-37c3-8a2e-48639d4f1153>
Submitted-with: OK: Code-Review: Gerrit User 1029953 <1029953@173816e5-2b9a-37c3-8a2e-48639d4f1153>
commit 92b2da48565dc807cb88a8df190452add9b150b2
Author: Gerrit User 1006192 <1006192@173816e5-2b9a-37c3-8a2e-48639d4f1153>
Date: Mon Mar 18 17:54:11 2019 +0000
Update patch set 1
Patch Set 1: Verified+1

23. 22Gerrit User Summit 2019 – Volvo Cars – Gothenburg - Sweden GerritForge.com 22
Submit Rules bye bye PROLOG
Submit rules extension point
In ANY language
(also PROLOG)

24. 23Gerrit User Summit 2019 – Volvo Cars – Gothenburg - Sweden GerritForge.com 23
Submit Rules PROLOG
submit_rule(submit(R)) :-
gerrit:unresolved_comments_count(0),
!,
gerrit:uploader(U),
R = label('All-Comments-Resolved', ok(U)).
submit_rule(submit(R)) :-
gerrit:unresolved_comments_count(U),
U > 0,
R = label('All-Comments-Resolved', need(_)).

25. 24Gerrit User Summit 2019 – Volvo Cars – Gothenburg - Sweden GerritForge.com 24
Submit Rules Java
public class NoUnresolvedCommentsRule implements SubmitRule {
private static final SubmitRequirement REQUIREMENT =
SubmitRequirement.builder()
.setType("unresolved_comments")
.setFallbackText("Resolve all comments")
.build();
@Override
public Collection<SubmitRecord> evaluate(ChangeData cd, SubmitRuleOptions options) {
Integer unresolvedComments = cd.unresolvedCommentCount();
SubmitRecord sr = new SubmitRecord();
sr.requirements = Collections.singletonList(REQUIREMENT);
sr.status =
unresolvedComments == null || unresolvedComments > 0
? SubmitRecord.Status.NOT_READY
: SubmitRecord.Status.OK;
return ImmutableList.of(sr);
}
}

26. 25Gerrit User Summit 2019 – Volvo Cars – Gothenburg - Sweden GerritForge.com 25
Core plugins plugin manager
Discover and install with one click

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More core plugins
Gitiles (!)
Delete-project (finally !!)
WebHooks (yeah !)

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Native Packages updates
RPMs for RedHat & CentOS 7.6
Debs for Debian & Ubuntu 18.04
Support for Docker in production

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What’s coming in v3.1
Polymer 2.0
Git Protocol v2 (secured)
Performance
Stability and Fixes
More CI integration

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Q&A: excited about the future of Gerrit?
Image from: http://cypp.rutgers.edu/ru-voting/political-information/public-opinion-polls/

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