MySQL InnoDB Cluster and Group Replication - OSI 2017 Bangalore

MySQL InnoDB Cluster and
Group Replication
Madhusudhan G Joshi
(madhusudhan.joshi@oracle.com)
Software Development Manager
Sujatha Sivakumar
(sujatha.sivakumar@oracle.com)
Principal Member Technical Staf

Copyright © 2017, Oracle and/or its affiliates. All rights reserved. | OSI, Bangalore, 13 October 20172
Safe Harbour Statement
The following is intended to outline our general product direction. It
is intended for information purposes only, and may not be
incorporated into any contract.
It is not a commitment to deliver any material, code, or
functionality, and should not be relied upon in making purchasing
decisions. The development, release, and timing of any features or
functionality described for Oracle’s products remains at the sole
discretion of Oracle.

Program Agenda
Introduction to MySQL Innodb Cluster
How to get it working
Introduction to Group Replication
Look and Feel of GR!
Monitoring
1
2
3
4
5

Introduction to MySQL Innodb Cluster1

InnoDB Cluster
Integrated Solution
●
Group Replication for high availability.
●
Asynchronous Replication for Read Scale-
out.
●
One-stop shell to deploy and manage the
cluster.
●
Seamlessly and automatically route the
workload to the proper database server
in the cluster.
●
Hide failures from the application.
M
M M
MySQL Connector
Application
MySQL Router
MySQL Connector
Application
MySQL Router
MQL Shell
HA
S1 S2 S3 S4 S…

How to get it working2

MySQL InnoDB Cluster
•
Start MySQL Shell
•
Deploy Instance (s)
•
dba.deploySandboxInstance(....)

•
Start MySQL Shell
•
Deploy Instance (s)
•
Initiate/Create ClusterInitiate/Create Cluster
shell.connect("root@localhost:1310");shell.connect("root@localhost:1310");
cluster = dba.createCluster('OSIcluster');cluster = dba.createCluster('OSIcluster');

few more moments ….
Is the Cluster on and available ?

•
Start MySQL Shell
•
Deploy Instance (s)
•
Create Cluster
Add few more instancesAdd few more instances
myOSI.addInstance("root@localhost:XXXX")myOSI.addInstance("root@localhost:XXXX")

How is the InnoDB Cluster now ?

•
Start MySQL Shell
•
Deploy Instance (s)
•
Create Cluster
•
Add more instances
Setup and start RouterSetup and start Router
bin/mysqlrouter --bootstrap localhost:bin/mysqlrouter --bootstrap localhost:
1310 --name OSIRouter1310 --name OSIRouter
Notice the
R/W, R ports
for MySQL
InnoDB
Cluster

MySQL Router
( layered on top of the MySQL Instances )
‘R’ Instance
Port :1311
‘R/W’ Instance
Port :1310
‘R’ Instance
Port :1312
Router is set and HA’d

MySQL InnoDB Cluster…on test
•
Start MySQL Shell
•
Deploy Instance (s)
•
Create Cluster
•
Add more instances
•
Setup and Start Router
Client connects to R/W InstanceClient connects to R/W Instance
andand
Kill R/W InstanceKill R/W Instance
Where do new client requests go to ???

MySQL InnoDB Cluster…on test
•
Start MySQL Shell
•
Deploy Instance (s)
•
Create Cluster
•
Add more instances
•
Setup and Start Router
•
Client Connects to R/W Instance
•
Kill R/W Instance
Client Requests handled by new R/W InstanClient Requests handled by new R/W Instan
How does the InnoDB Cluster look like
….now ???

MySQL Router
( layered on top of the MySQL Instances )
‘R/W’ Instance
Port :1311
‘R’ Instance
Port :1312

Copyright © 2017, Oracle and/or its affiliates. All rights reserved. | Percona Live, Dublin, 27 September 201717
Introduction to Group Replication3

MySQL Group Replication
Traditional database
●
Many clients
●
One server
server
clients

server
A
server
B
server
C
clients
Group Replication
●
Many clients
●
Many servers
●
Read scalability
●
Write everywhere*
●
Elastic,
Highly available
●
Agreement on:
●
Members
●
Message delivery
●
State updates

server
A
server
B
W WW
server
C
R RR R RR
clients
Group Replication
●
Many clients
●
Many servers
●
Read scalability
●
Write everywhere*
●
Elastic,
Highly available
●
Agreement on:
●
Members
●
Message delivery
●
State updates

server
A
server
B
W RW
server
C
R W RW
clients
WR
Group Replication
●
Many clients
●
Many servers
●
Read scalability
●
Write everywhere*
●
Elastic,
Highly available
●
Agreement on:
●
Members
●
Message delivery
●
State updates
Limitations apply!
https://dev.mysql.com/doc/refman/8.0/en/group-replication-limitations.html

server
A
server
B
W RW
server
C
R W RW
clients
server
D
WR
Group Replication
●
Many clients
●
Many servers
●
Read scalability
●
Write everywhere*
●
Elastic,
Highly available
●
Agreement on:
●
Members
●
Message delivery
●
State updates

server
A
server
B
W RW
server
C
WR R W RW
clients
server
D
server
E
Group Replication
●
Many clients
●
Many servers
●
Read scalability
●
Write everywhere*
●
Elastic,
Highly available
●
Agreement on:
●
Members
●
Message delivery
●
State updates

server
A
server
B
W RW
server
C
R WR W RW
clients
server
D
server
E
Group Replication
●
Many clients
●
Many servers
●
Read scalability
●
Write everywhere*
●
Elastic,
Highly available
●
Agreement on:
●
Members
●
Message delivery
●
State updates

server
A
server
B
W RW
server
C
R WR W RW
clients
server
E
Group Replication
●
Many clients
●
Many servers
●
Read scalability
●
Write everywhere*
●
Elastic,
Highly available
●
Agreement on:
●
Members
●
Message delivery
●
State updates

server
A
server
B
W RW
server
C
R WR W RW
clients
Group Replication
●
Many clients
●
Many servers
●
Read scalability
●
Write everywhere*
●
Elastic,
Highly available
●
Agreement on:
●
Members
●
Message delivery
●
State updates

8.0 Operations: Set Next Primary
BA C
W WW
SET group_replication_member_weight = [0-100]
Dw=25 w=20
R RR R RR R RR
w=10w=35

W WW
BA Cw=35 Dw=10 w=25 w=20
R RR R RR R RR

B C Dw=10 w=25 w=20
? ? ?
W WW R RR R RR R RR

B C Dw=10 w=25 w=20
? ? ?
W WW R RR R RR R RR
25 is the biggest
→ C is new primary

B C Dw=10 w=25 w=20
W WW R RR R RR R RR

8.0 Operations: No Writes After Leaving
Group
BA C D
W WW

Group
BA C D
Locally on A:
STOP GROUP REPLICATION
W WW
1. Disallow new writes
2. Wait for ongoing writes
3. Leave group

Group
BA C D
Locally on A:
W WW
3. Leave group

W WW
Group
BA C D
Locally on A:
3. Leave group

server
A
server
B
W RW
server
C
R WR W RW
clients
We are 3:
A, B, C!
We are 3:
A, B, C!
We are 3:
A, B, C!
Group Replication
●
Many clients
●
Many servers
●
Read scalability
●
Write everywhere*
●
Elastic,
Highly available
●
Agreement on:
●
Members
●
Message delivery
●
State updates

server
A
server
B
W RW
server
C
R WR W RW
clients
Group Replication
●
Many clients
●
Many servers
●
Read scalability
●
Write everywhere*
●
Elastic,
Highly available
●
Agreement on:
●
Members
●
Message delivery
●
State updates

server
A
server
B
W RW R WR W RW
clients
You and me:
A and B!
You and me:
A and B!
Group Replication
●
Many clients
●
Many servers
●
Read scalability
●
Write everywhere*
●
Elastic,
Highly available
●
Agreement on:
●
Members
●
Message delivery
●
State updates

server
A
server
B
W RW R WR W RW
clients
Group Replication
●
Many clients
●
Many servers
●
Read scalability
●
Write everywhere*
●
Elastic,
Highly available
●
Agreement on:
●
Members
●
Message delivery
●
State updates
B B
A A
All receive in
same order

server
A
server
B
W RW R WR W RW
clients
Group Replication
●
Many clients
●
Many servers
●
Read scalability
●
Write everywhere*
●
Elastic,
Highly available
●
Agreement on:
●
Members
●
Message delivery
●
State updates
Table
row 1
row 2
row 3
Queue
insert row 4
Table
row 1
row 2
Queue
insert row 3
insert row 4

server
A
server
B
W RW WR
clients
Group Replication
●
Non conflicting
transactions are
certified positive.
●
For Conflicting
transactions first
committer wins
UPDATE t1
SET a=3
WHERE a=1
UPDATE t1
SET a=4
Where a=2
OK OK

server
A
server
B
W RW WR
clients
Group Replication
●
Non conflicting
transactions are
certified positive.
●
For Conflicting
transactions first
committer wins
UPDATE t1
SET a=3
WHERE a=1 UPDATE t1
SET a=4
Where a=1OK

Look and Feel of GR!4

Group Replication
●
MySQL plugin
●
Uses InnoDB
●
Uses row format
●
Monitor using
performance schema
●
Full GTID support
●
Auto-increment
handling
●
Version access control
GR in 8 is gr8

Group Replication
●
MySQL plugin
●
Uses InnoDB
●
Monitor using
performance schema
●
●
Auto-increment
handling
●
server
A
server
B
W RW WR
clients
INSERT x;
Will have
GTID:UUID:1
INSERT y;
Will have
GTID:UUID:2
Full GTID support
All group members share the same UUID, the
group name.

Group Replication
●
MySQL plugin
●
Uses InnoDB
●
Monitor using
performance schema
●
Full GTID support
●
●
server
A
server
B
W RW WR
INSERT x;
X:1
INSERT y;
Y:2
INSERT z;
Y:9
Auto-increment
handling
●
By default, the ofset is provided by
server_id and increment is 7.
●
Users can change the increment size using
group_replication_auto_increment_increment
option.

Group Replication
●
MySQL plugin
●
Uses InnoDB
●
Monitor using
performance schema
●
Full GTID support
●
Auto-increment
handling
MySQL
5.7.13
MySQL
5.7.14
W RW
MySQL
5.7.15
R WR W RW
Member with different patch version is allowed to
join the gorup.
MySQL
5.7.16
OK

Group Replication
●
MySQL plugin
●
Uses InnoDB
●
Monitor using
performance schema
●
Full GTID support
●
Auto-increment
handling
MySQL
8.0
MySQL
8.0
W RW
MySQL
8.0
R WR W RW
Member with lower major version than the major
version in the group is not allowed to join group.
MySQL
5.7.16
No

Group Replication
●
MySQL plugin
●
Uses InnoDB
●
Monitor using
performance schema
●
Full GTID support
●
Auto-increment
handling
MySQL
5.7.13
MySQL
5.7.14
W RW
MySQL
5.7.15
R WR W RW
Member with higher major version is allowed to
join but is not allowed to do writes. (Read only)
MySQL
8.0
OK

MySQL Async Replication

MySQL Async Replication
Example: Async replication between geo-distributed groups

Replication Architecture: Applier Pipeline
Replica
Relay
Log
Worker
Queues
Worker
Threads
Coordinator
Thread
Receiver
Thread
network

Replica
Relay
Log
Worker
Queues
Worker
Threads
Coordinator
Thread
Receiver
Thread
network

8.0 Performance: Applier Pipeline
 Parallelize reads and writes to relay log
 Performance for free
Replica
Relay
Log
Worker
Queues
Worker
Threads
Coordinator
Thread
Receiver
Thread
network
trx1
trx1

Monitoring5

8.0 Monitoring: Group Members
 Who are in this group?
– server_uuid, host, port, MySQL version
 Who is the primary?
 Online status of each node
mysql> SELECT … FROM performance_schema.replication_group_members
MEMBER_ID MEMBER_HOST MEMBER_PORT MEMBER_STATE MEMBER_ROLE MEMBER_VERSION
<uuid-A> murkla 3306 ONLINE PRIMARY 5.7.20
<uuid-B> kremla 3306 ONLINE SECONDARY 5.7.21
<uuid-C> kantarell 3306 UNREACHABLE SECONDARY 8.0.3
New in 8.0
B
5.7.21
A
5.7.20
C
8.0.3

8.0 Monitoring: Group Member Statistics
 Statistics used to diagnose group members
– Conflict ratio of the group
– Conflict ratio of each member (multi-primary)
– Is any member falling behind on certification or applying?
 Table performance_schema.replication_group_member_stats:
counts of transactions, by member:
– Positively/negatively certified transactions of any origin
– Positively/negatively certified transactions from the node
– Transactions waiting to be certified
– Certified transactions waiting to be applied

“I can’t w8 to replic8 with version 8”
 Evalu8
http://www.mysql.com/downloads/
 Educ8
Innodb cluster:
https://dev.mysql.com/doc/refman/8.0/en/mysql-innodb-cluster-userguide.html
group replication:
http://dev.mysql.com/doc/refman/8.0/en/group-replication.html
 Contempl8
http://mysqlhighavailability.com
 Cooper8
https://bugs.mysql.com/

Thank You!& cu l8r, m8s

MySQL InnoDB Cluster and Group Replication - OSI 2017 Bangalore

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