Trillian Feature/Implementation Matrix

Overview
Functionality
- Log v1
- Log v2
Concrete implementations

Overview

This page summarises the various features which are present in Trillian, and their implementation status.

The status of features is listed as one of:

Not Implemented (NI)
In Development
Partial
Alpha
Beta
General Availability (GA)
Deprecated (⚠)

Functionality

	Status	Deployed in production	Notes
Log V1	GA	✓

Trillian Log V1

This is feature complete, and is actively used in production by multiple CT log operators, including Google.

Trillian Log V2 (Skylog)

Skylog is an append-only log with considerably higher throughput and lower integration latency than the v1 log. It currently exists as internal prototype.

Concrete implementations

This section lists the status of implementations for the pluggable subsystems which Trillian supports.

Build tags can be used to control which storage and quota implementations are compiled in to Trillian binaries.

Storage

Trillian supports "pluggable" storage implementations for durable storage of the merkle tree data. The state and characteristics of these implementations are detailed below.

V1 log storage

The Log storage implementations supporting the original Trillian log.

Storage	Status	Deployed in prod	Notes
Spanner	GA	✓	Google internal-only, see CloudSpanner for external use.
CloudSpanner	Beta		Google maintains continuous-integration environment based on CloudSpanner.
MySQL	GA	✓
CockroachDB	Alpha		Supported by Equinix Metal.
PostgreSQL	Beta		Supported by Rob Stradling at Sectigo.

Spanner

This is a Google-internal implementation, and is used by all of Google's current Trillian deployments.

CloudSpanner

This implementation uses the Google CloudSpanner APIs in GCE. It's been tested to tens of billions of entries and tens of log tenants.

Performance largely depends on the number of CloudSpanner servers allocated, but write throughput of 1000+ entries/s has been observed.

Issue #1681 tracks this becoming ready for GA.

MySQL

This implementation has been tested with MySQL 5.7. It's currently in production use by at least one CT log operator.

Write throughput of 4-500 entries/s has been observed.

CockroachDB

This implementation has been tested with CockroachDB 22.1.10.

It's currently in alpha mode and is not yet in production use.

PostgreSQL

This implementation has been tested with PostgreSQL 17.0 and 13.20.

It's currently in beta mode, and is used by some of Sectigo's current Trillian deployments.

Monitoring

Supported monitoring frameworks, allowing for production monitoring and alerting.

Monitoring	Status	Deployed in prod	Notes
Prometheus	GA	✓
OpenCensus	Partial		Currently, only support for Tracing is implemented.

Master election

Supported frameworks for providing Master Election.

Election	Status	Deployed in prod	Notes
Chubby	GA	✓	Google internal-only.
etcd	GA	✓
k8s	Alpha		Supported by Tomas Turek at Red Hat

Quota

Supported frameworks for quota management.

Implementation	Status	Deployed in prod	Notes
Google internal	GA	✓
etcd	GA	✓
MySQL	Beta	?
Redis	Alpha	✓
CockroachDB	Alpha		Supported by Equinix Metal.
PostgreSQL	Beta		Supported by Rob Stradling at Sectigo.

Key management

Supported frameworks for key management and signing.

Election	Status	Deployed in prod	Notes
Google internal	GA	✓
golang stdlib	GA		i.e PEM files, etc.
PKCS#11	GA	?

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