My First 90 days with Vitess

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This document summarizes the author's first 90 days of experience with Vitess, an open source database proxy. It provides an overview of Vitess, including that it sits between applications and MySQL to provide routing, query consolidation, and other features. It also discusses Vitess terminology, questions about MySQL compatibility, consistency models, and other quirks and features. The document concludes with a discussion of the best use cases for Vitess and areas where it could be improved.

My first 90 days
with Vitess
October 2019
Morgan Tocker

Agenda
1. What is Vitess?
2. Terminology Essentials
3. My Questions (MySQL Compatibility, Consistency Model..)
4. Other Quirks and Features
5. The Best Use Case
6. Where Vitess Could Improve
2

What is Vitess?
3
Middleware/Proxy
● Sits in between your
application and MySQL
● Provides Routing,
Query Consolidation,
Connection Pooling
Orchestration
● Includes Monitoring &
Backup
● Integrates with
Orchestrator and
provides failover
And More...
● VReplication
● Vitess Messaging
● Easier deployment
path into Kubernetes
Not a straightforward single-category answer

Vitess Architecture
4 PlanetScale Data Platform - Deploy, Manage, Monitor
VitessApp

Vitess serves millions of QPS in production
5
Quiz of
Kings

Terminology: The Essentials
VTGate: The Proxy that your applications connect to.
Topo Server: The etcd server containing meta data.
Tablet: A combination of a vttablet and a MySQL server.
Keyspace: a logical “MySQL database” (aka schema). Keyspaces
can be sharded or unsharded.
Cell: A data center
6 https://vitess.io/docs/concepts/

My-MySQL Questions
7
● What version of MySQL is it?
VTGate currently advertises itself as MySQL 5.5.
● What versions of MySQL does it support?
MySQL 5.6+ and MariaDB 10.0+
Requires RBR + GTIDs enabled
Strongly recommends semi-sync

My Questions: What queries are supported?
8
● Depends on if keyspace is sharded
● Major Limitations:
○ SET [SESSION] var = x;
○ GROUP BY key ORDER BY different_key;
https://vitess.io/docs/faq/queries/#is-there-a-list-of-supported-unsupported-queries

Quirks and Other Features
• All queries are SQL parsed
• They may be changed before routing to mysqld, but best
attempt is made to preserve comments!
10

Quirks (cont.)
• The original designed used a gRPC protocol to VTGate instead
of MySQL - it still exists!
• The original design also had type safety - very different from
MySQL’s history!
• This pedantic design helps a lot
• Easier to add flexibility later vs. remove it
11

Quirks (cont.)
• Scalability Philosophy = 250G shards
• Makes sense once explained
• Biggest benefit is fast recovery time
12

(Translucent) Sharding
• Still designing a VSchema
• Recommend modeling updates to be single shard
• vs. transparent:
• Distributes data everywhere
• Possible latency penalty; typically a new engine
13

Vitess Integrations
• Orchestrator
• ZooKeeper/etcd/Consul
• XtraBackup
• MySQL/MariaDB Replication
14

The “Best Use Case”
Signs you might be a fit include:
• You currently have schema-per-tenant
• You have a multi-tenant Application
• You need an upgrade path from MySQL to sharded MySQL
• Your monolithic databases are blocking your Kubernetes
adoption
15

To Be Aware Of
Still MySQL underneath
• Including the MySQL Optimizer (good for OLTP)
• In some cases may improve analytics (VReplication + parallel
scatter gather). Not All.
Born as an Internal Company Project
• Ease of use not Day 1 Priority
• It is a Priority for PlanetScale
16

Questions
Join the Vitess Slack Community!
https://vitess.io
17

Features I’ve worked on
MySQL Flavor detection
Used to bootstrap MySQL Server correctly (mysql_install_db
versus mysqld --initialize etc).
Go modules support
18

Things I would like to see improved
Reduce delta from MySQL default configuration
Add support for additional SQL syntax:
NOOP where safe for connectors
Reduce pedantic-ness of design for compatibility
Reduce shell scripting in examples (use ~/.vitess.cnf etc)
Embrace smaller footprint for development environments:
VTCombo
19

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