Priyanka, a MySQL cluster developer, presented MySQL cluster in the MySQL User camp. The slide deck contains an introduction to the cluster module- the architecture, auto-sharding, failover etc in the cluster module.

1. MySQL Cluster
Priyanka Sangam
(priyanka.sangam@oracle.com)
Insert Picture Here

2. Safe Harbour Statement
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It is not a commitment to deliver any
material, code, or functionality, and should
not be relied upon in making purchasing
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3. Agenda
• Introduction to MySQL Cluster
• Working with Cluster tables
• Cluster Nodes
• Architecture
• Auto-sharding
• Failover

4. Introduction to MySQL Cluster
• Distributed transactional database
• In-memory storage
• Auto-sharding
• Shared-nothing architecture
• Automatic failover and recovery
• Runs on commodity hardware
• SQL + NoSQL interfaces

5. mysql> create table t1(id int primary key, value varchar(10))engine=ndb;
Query OK, 0 rows affected (0.80 sec)
mysql> show create table t1;
+­­­­­­­+­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­+
| Table | Create Table |
+­­­­­­­+­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­+
| t1 | CREATE TABLE `t1` (
`id` int(11) NOT NULL,
`value` varchar(10) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=ndbcluster DEFAULT CHARSET=latin1 |
+­­­­­­­+­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­+
1 row in set (0.00 sec)
mysql> insert into t1 values(1, "one"), (2,"two");
Query OK, 2 rows affected (0.00 sec)
Records: 2 Duplicates: 0 Warnings: 0
mysql> select * from t1;
+­­­­+­­­­­­­+
| id | value |
+­­­­+­­­­­­­+
| 1 | one |
| 2 | two |
+­­­­+­­­­­­­+
2 rows in set (0.00 sec)
Working with Cluster Tables

6. Cluster Nodes
•Data Nodes
•Store cluster data
•Data partitioned + replicated across many data nodes
•ndbd (single-threaded) or ndbmtd (multi-threaded)
•SQL Nodes
•Access cluster data by querying data nodes
•SQL + NoSQL
•mysqld
•Management Nodes
•Manage other nodes
•Config, startup, shutdown, backup etc.
•ndb_mgmd

8. Architecture

9. ndb_mgm
mysql@host1:~$ ndb_mgm ­e show
Connected to Management Server at: localhost:1186
Cluster Configuration
­­­­­­­­­­­­­­­­­­­­­
[ndbd(NDB)] 2 node(s)
id=2 @127.0.0.1 (mysql­5.5.36 ndb­7.2.16, Nodegroup: 0, *)
id=4 @127.0.0.1 (mysql­5.5.36 ndb­7.2.16, Nodegroup: 0)
[ndb_mgmd(MGM)] 1 node(s)
id=1 @127.0.0.1 (mysql­5.5.36 ndb­7.2.16)
[mysqld(API)] 4 node(s)
id=3 @127.0.0.1 (mysql­5.5.36 ndb­7.2.16)
id=5 (not connected, accepting connect from any host)
id=7 (not connected, accepting connect from any host)
id=9 (not connected, accepting connect from any host)

10. Auto-sharding – partitioning a table

11. Auto-sharding – fragments

12. Auto-sharding - nodegroups

13. Failover
• << Initial state >>
• Node1: Primary F1, Secondary F2, Nodegroup 0
• Node2: Primary F2, Secondary F1, Nodegroup 0
• Node3: Primary F3, Secondary F4, Nodegroup 1
• Node4: Primary F4, Secondary F3, Nodegroup 1
• << Node1 fails >>
• Node2: Primary F1, Primary F2
• Node3: Primary F3, Secondary F4, Nodegroup 1
• Node4: Primary F4, Secondary F3, Nodegroup 1
• << Node2 fails >>
• Cluster failure due to missing nodegroup
• Node3. Node4 shut down

14. References
• Introduction to MySQL Cluster:
http://www.slideshare.net/andrewjamesmo
rgan/mysql-cluster-introduction
• Cluster Reference Manual:
http://dev.mysql.com/doc/mysql-cluster-ex
cerpt/5.1/en/index.html