MaxScale is an open-source pluggable router designed for high scalability, availability, and flexible connection management between clients and database servers. It supports multiple protocols, features a read/write split router for load balancing, and offers a variety of enhancements such as Galera support and configurable monitoring. Future developments include advanced filtering and routing capabilities to optimize database interactions.

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MaxScale
The
Pluggable
Router

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The
Presenter:
Vilho
Raatikka
2
• MaxScale Developer
•Read/write split router
•Query classifier
•Log manager
•Concurrency control, availability,
error handling, build & test env
!
• IBM solidDB 2004-2013
•In-Memory Engine
•High Availability Controller
!
• M.Sc., University of Helsinki
•Researcher
•Teaching assistant

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MaxScale
Objectives
3
• Highly
scalable
• Transparent
to
the
application
• Highly
available
• Extendible
• Flexible
• Modules
specify
what
MaxScale
is
:
router
/
firewall
/
data
extract
tool
/…
• Open
source,
GPL2
software
since
8th
of
Jan.
2014

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How?
In
a
nutshell
4
Allows
mulVple
protocols
for
clients
and
servers
Alter,
block
or
log
client
requests
and
results
ConfiguraVon
and
state
aware
monitors
Content-­‐aware
or
unaware
routers
Client
authenVcates
once
-­‐
with
MaxScale
Core of MaxScale is multi-threaded, event-driven network IO processor

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Read
Scalability
with
MySQL
5
Using MaxScale’s Connection Load Balancing

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Consistent
Read
Scalability
with
Galera
6
using MaxScale’s Read/Write Split Router

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Query
rewrite
and
filtering
7
By using MaxScale’s filters

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Query
rewrite
and
filtering
(cont.)
8
By using MaxScale’s filters

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MaxScale
0.7
9
• Galera
Support
‣ Read/Write
Split
router
for
Galera
Cluster
• Multiple
slaves
support
‣ Read/Write
Split
router
allows
multiple
slave
connections
and
balancing
load
between
them
• Debug
Interface
enhancements
‣ Support
for
wide
variety
of
MaxScale
objects
which
can
be
referenced
by
their
names
instead
of
memory
addresses
‣ User
mode
to
prevent
access
by
using
memory
addresses
• Maintenance
mode
for
servers
• Configurable
monitoring
interval
• Replication
Lag
Heartbeat
Monitor
• Filters
API
• MariaDB
10
Replication
support
in
MySQL
monitor
Release
notes:
https://github.com/skysql/MaxScale/blob/release-­‐0.7/Documentation/Debug%20And%20Diagnostic%20Support.pdf

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Basic
Setup
• Clients
access
MaxScale
• MaxScale
in
the
app
server,
UNIX
sockets
• Database
servers
accessed
via
TCP
10
Database
Database
Database Database Database
MaxScale
• Clients
• Application Servers
Database Cluster

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Typical
Scenarios
• MySQL
Replication
with
‣Read
connection
load
balancing
‣Read/Write
statement
splitting
• Galera
Cluster
‣Connection
load
balancing
‣Read/Write
statement
splitting
‣Write
conflict
avoidance
(planned)
11
Database
Database
Database Database Database
MaxScale

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Inside
MaxScale
MySQL
Local
Authentication
12
“read user, host”
connect/auth
Users
are
loaded
at
start
Backends
ok
Clients

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“call my_proc(1)”
Inside
MaxScale
Read/Write
Splitting
Master
Slaves
!
Call
parser
and
examine
parse
treeQuery
Classifier

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Inside
MaxScale
Routing
14
SQL
MySQL packets
TCP packets
MySQL
MySQL
MySQL
Client
Router
MySQL client
Core
AuhenicationQuery
classifier
Monitor
MySQL
backend

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Inside
MaxScale
Routing
15
SQL
MySQL packets
TCP packets
MySQL
MySQL
MySQL
Client
Router
MySQL client
Core
AuhenicationQuery
classifier
Monitor
MySQL
backend

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What's
new
in
R/W
split
router
16
• Session
Commands
‣ Local
variables,
User
change,
SET
auto
commit
‣ Execute
in
master
&
slave
but
maintain
execution
order
‣ Current
limitation
:
queries
not
supported
in
session
commands
SET
@a=(SELECT
COUNT(*)
FROM
mysql.user)
is
executed
in
both
nodes.
• Galera
H/A
Support
• Fault
Tolerance
• Replication
consistency
• Transaction
support
‣ Within
active
transaction
everything
is
routed
to
master
‣ Detection
of
implicit
BEGIN
and
ROLLBACK/
COMMIT
M
S

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What’s
coming
•
Filters
•
Routing
hints
•Multiple
Slave
Support
•Weight
based
routing
•
Backend
failure
tolerance
•
Enforce
Node
Replication
consistency
for
MariaDB
10
&
MySQL
5.6
17

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Extending
with
filters
18
Filter
Router
MaxScale
Router
Filter
Auth
Protocol
Monitor
Filter
Router
Monitor
©
SkySQL
Ab
2014
Protocol
ProtocolProtocol
INSERT INTO DWH.T1 (....)
Log Entry
• May
be
connected
to
form
arbitrary
chains
• Allows
inspection,
modification
and
rejection
of
requests
and
results
‣ blacklist
‣ data
mining
/
log
Routing Hint

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Get
involved
19
• Check on GitHub https://github.com/skysql/MaxScale
• MariaDB Source https://downloads.mariadb.org/
• Bugs report
http://bugs.skysql.com/buglist.cgi?product=Maxscale
• Google groups https://groups.google.com/forum/#!forum/maxscale
• Binary Tarball http://downloads.skysql.com/files/SkySQL/MaxScale
• SkySQL website http://www.skysql.com

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Demo
scenarios
20
Database
Database
Database Database Database
MaxScale
‣1
Master
‣4
Slaves

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Demo
scenarios
21
Database Database Database
MaxScale
‣3
Galera
servers

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Thank you !
MaxScale