Introduction to MySQL InnoDB Cluster
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1 1 / 148
2 2 / 148
3 3 / 148 Introduction to MySQL InnoDB Cluster MySQL High Availability made easy Percona Live Europe - Dublin 2017 Frédéric Descamps - MySQL Community Manager - Oracle
4 4 / 148 Safe Harbor Statement The following is intended to outline our general product direction. It is intended for information purpose 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 up in making purchasing decisions. The development, release and timing of any features or functionality described for Oracle s product remains at the sole discretion of Oracle.
5 5 / Who am I?
6 6 / 148 Frédéric MySQL Evangelist Hacking MySQL since 3.23 devops believer MySQL Community Manager since May 2016 living in Belgium
7 7 / 148
8 8 / % virtually all organizations require their most critical systems to be highly available!
9 9 / 148 MySQL InnoDB Cluster "High Availability becomes a core first class feature of MySQL!"
10 10 / 148 MySQL InnoDB Cluster: vision "A single product - MySQL - with high availability and scaling features baked in; providing an integrated end-to-end solution that is easy to use."
11 11 / 148 MySQL InnoDB Cluster: vision "A single product - MySQL - with high availability and scaling features baked in; providing an integrated end-to-end solution that is easy to use." Ease-of-Use Built-in HA InnoDB cluster Out-of-Box Solution Everything Integrated Extreme Scale-Out High Performance
12 12 / 148 MySQL InnoDB Cluster: goals One Product: MySQL All components created together Tested together Packaged together Easy to Use One client: MySQL Shell Easy packaging Integrated orchestration Homogenous servers Flexible and Modern SQL and NoSQL together Protocol Buffers Asynchronous API Developer friendly Support Read/Write Scale Out Shared clusters Federated system of N replica sets supporting cross shard operations Each replica set manages a shard
13 13 / 148 Our vision in 4 steps E1 Relational & Document Models MySQL Document Store E3 Read Scale-Out Async Replication + Auto Failover E2 MySQL HA Out-Of-Box HA Write Scale-Out E4 Sharding
14 MySQL Connector MySQL Connector 14 / 148 Step 2 s Architecture Application Application MySQL Router MySQL Router Mp MySQL Shell M InnoDB cluster M
15 MySQL Connector MySQL Connector 15 / 148 Step 3 s Architecture Application Application MySQL Router MySQL Router Mp MySQL Shell M InnoDB cluster M S1 S2 S3 S4 S...
16 MySQL Router MySQL Router MySQL Router MySQL Router MySQL Router 16 / 148 Step 4 s Architecture Application MySQL Connector Application MySQL Connector Application MySQL Connector Application MySQL Connector Application MySQL Connector Mp Mp Mp MySQL Shell replicaset 1 S1 M M InnoDB cluster S2 S3 S4 S... replicaset 2 M M InnoDB cluster S1 S2 S3 S4 S... replicaset 3 M M InnoDB cluster S1 S2 S3 S4 S...
17 17 / 148 Group Replication: heart of MySQL InnoDB Cluster
18 18 / 148 Group Replication: heart of MySQL InnoDB Cluster
19 19 / 148 MySQL Group Replication but what is it?!?
20 20 / 148 MySQL Group Replication but what is it?!? GR is a plugin for MySQL, made by MySQL and packaged with MySQL
21 21 / 148 MySQL Group Replication but what is it?!? GR is a plugin for MySQL, made by MySQL and packaged with MySQL GR is an implementation of Replicated Database State Machine theory
22 22 / 148 MySQL Group Replication but what is it?!? GR is a plugin for MySQL, made by MySQL and packaged with MySQL GR is an implementation of Replicated Database State Machine theory GR allows to write on all Group Members (cluster nodes) simultaneously while retaining consistency
23 23 / 148 MySQL Group Replication but what is it?!? GR is a plugin for MySQL, made by MySQL and packaged with MySQL GR is an implementation of Replicated Database State Machine theory GR allows to write on all Group Members (cluster nodes) simultaneously while retaining consistency GR implements conflict detection and resolution
24 24 / 148 MySQL Group Replication but what is it?!? GR is a plugin for MySQL, made by MySQL and packaged with MySQL GR is an implementation of Replicated Database State Machine theory GR allows to write on all Group Members (cluster nodes) simultaneously while retaining consistency GR implements conflict detection and resolution GR allows automatic distributed recovery
25 25 / 148 MySQL Group Replication but what is it?!? GR is a plugin for MySQL, made by MySQL and packaged with MySQL GR is an implementation of Replicated Database State Machine theory GR allows to write on all Group Members (cluster nodes) simultaneously while retaining consistency GR implements conflict detection and resolution GR allows automatic distributed recovery Supported on all MySQL platforms!! Linux, Windows, Solaris, OSX, FreeBSD
26 26 / 148 MySQL Group Communication System (GCS) MySQL Xcom protocol
27 27 / 148 MySQL Group Communication System (GCS) MySQL Xcom protocol Replicated Database State Machine
28 28 / 148 MySQL Group Communication System (GCS) MySQL Xcom protocol Replicated Database State Machine Paxos based protocol
29 29 / 148 MySQL Group Communication System (GCS) MySQL Xcom protocol Replicated Database State Machine Paxos based protocol its task: deliver messages across the distributed system:
30 30 / 148 MySQL Group Communication System (GCS) MySQL Xcom protocol Replicated Database State Machine Paxos based protocol its task: deliver messages across the distributed system: atomically
31 31 / 148 MySQL Group Communication System (GCS) MySQL Xcom protocol Replicated Database State Machine Paxos based protocol its task: deliver messages across the distributed system: atomically in Total Order
32 32 / 148 MySQL Group Communication System (GCS) MySQL Xcom protocol Replicated Database State Machine Paxos based protocol its task: deliver messages across the distributed system: atomically in Total Order MySQL Group Replication receives the Ordered 'tickets' from this GCS subsystem.
33 33 / 148 And for users?
34 34 / 148 And for users? no longer necessary to handle server fail-over manually or with a complicated script
35 35 / 148 And for users? no longer necessary to handle server fail-over manually or with a complicated script GR provides fault tolerance
36 36 / 148 And for users? no longer necessary to handle server fail-over manually or with a complicated script GR provides fault tolerance GR enables update-everywhere setups
37 37 / 148 And for users? no longer necessary to handle server fail-over manually or with a complicated script GR provides fault tolerance GR enables update-everywhere setups GR handles crashes, failures, re-connetcs automatically
38 38 / 148 And for users? no longer necessary to handle server fail-over manually or with a complicated script GR provides fault tolerance GR enables update-everywhere setups GR handles crashes, failures, re-connetcs automatically Allows an easy setup of a MySQL service high available!
39 39 / 148 OK, but how does it work?
40 40 / 148 OK, but how does it work? it s just...
41 41 / 148 OK, but how does it work? it s just...
42 42 / 148 OK, but how does it work? it s just no, in fact the writesets replication is synchronous and then certification and apply of the changes are local to each nodes and asynchronous.
43 43 / 148 OK, but how does it work? it s just no, in fact the writesets replication is synchronous and then certification and apply of the changes are local to each nodes and asynchronous. not that easy to understand... right? As a picture is worth a 1000 words, let s illustrate this...
44 44 / 148 MySQL Group Replication
45 45 / 148 MySQL Group Replication
46 46 / 148 MySQL Group Replication
47 47 / 148 MySQL Group Replication
48 48 / 148 MySQL Group Replication
49 49 / 148 MySQL Group Replication
50 50 / 148 MySQL Group Replication
51 51 / 148 MySQL Group Replication
52 52 / 148 MySQL Group Replication
53 53 / 148 MySQL Group Replication
54 54 / 148 MySQL Group Replication
55 55 / 148 MySQL Group Replication
56 56 / 148 MySQL Group Replication (full transaction)
57 57 / 148 MySQL Group Replication (full transaction)
58 58 / 148 MySQL Group Replication (full transaction)
59 59 / 148 MySQL Group Replication (full transaction)
60 60 / 148 MySQL Group Replication (full transaction)
61 61 / 148 MySQL Group Replication (full transaction)
62 62 / 148 MySQL Group Replication (full transaction)
63 63 / 148 MySQL Group Replication (full transaction)
64 64 / 148 MySQL Group Replication (full transaction)
65 65 / 148 Group Replication : Total Order Delivery - GTID
66 66 / 148 Group Replication : Total Order Delivery - GTID
67 67 / 148 Group Replication : Total Order Delivery - GTID
68 68 / 148 Group Replication : Total Order Delivery - GTID
69 69 / 148 Group Replication : Total Order Delivery - GTID
70 70 / 148 Group Replication : Total Order Delivery - GTID
71 71 / 148 Group Replication : Total Order Delivery - GTID
72 72 / 148 Group Replication : Total Order Delivery - GTID
73 73 / 148 Group Replication : Total Order Delivery - GTID
74 74 / 148 Group Replication : Total Order Delivery - GTID
75 75 / 148 Group Replication : Total Order Delivery - GTID
76 76 / 148 Group Replication : Total Order Delivery - GTID
77 77 / 148 Group Replication : Total Order Delivery - GTID
78 78 / 148 Group Replication : Total Order Delivery - GTID
79 79 / 148 Group Replication : Total Order Delivery - GTID
80 80 / 148 Group Replication : Total Order Delivery - GTID
81 81 / 148 Group Replication : Total Order Delivery - GTID
82 82 / 148 Group Replication : Total Order Delivery - GTID
83 83 / 148 Group Replication : Total Order Delivery - GTID
84 84 / 148 Group Replication: return commit Asynchronous Replication:
85 85 / 148 Group Replication: return from commit (2) Semi-Sync Replication:
86 86 / 148 Group Replication: return from commit (3) Group Replication:
87 87 / 148 Group Replication : Optimistic Locking Group Replication uses optimistic locking
88 88 / 148 Group Replication : Optimistic Locking Group Replication uses optimistic locking during a transaction, local (InnoDB) locking happens
89 89 / 148 Group Replication : Optimistic Locking Group Replication uses optimistic locking during a transaction, local (InnoDB) locking happens optimistically assumes there will be no conflicts across nodes (no communication between nodes necessary)
90 90 / 148 Group Replication : Optimistic Locking Group Replication uses optimistic locking during a transaction, local (InnoDB) locking happens optimistically assumes there will be no conflicts across nodes (no communication between nodes necessary) cluster-wide conflict resolution happens only at COMMIT, during certification
91 91 / 148 Group Replication : Optimistic Locking Group Replication uses optimistic locking during a transaction, local (InnoDB) locking happens optimistically assumes there will be no conflicts across nodes (no communication between nodes necessary) cluster-wide conflict resolution happens only at COMMIT, during certification Let s first have a look at the traditional locking to compare.
92 92 / 148 Traditional locking
93 93 / 148 Traditional locking
94 94 / 148 Traditional locking
95 95 / 148 Traditional locking
96 96 / 148 Traditional locking
97 97 / 148 Traditional locking
98 98 / 148 Optimistic Locking
99 99 / 148 Optimistic Locking
100 100 / 148 Optimistic Locking
101 101 / 148 Optimistic Locking
102 102 / 148 Optimistic Locking
103 103 / 148 Optimistic Locking
104 104 / 148 Optimistic Locking The system returns error 149 as certification failed: ERROR 1180 (HY000): Got error 149 during COMMIT
105 105 / 148 Such conflicts happen only when using multiprimary group!
106 106 / 148 Certification Certification is the process that only needs to answer the following unique question:
107 107 / 148 Certification Certification is the process that only needs to answer the following unique question: can the write (transaction) be applied?
108 108 / 148 Certification Certification is the process that only needs to answer the following unique question: can the write (transaction) be applied? based on unapplied earlier transactions
109 109 / 148 Certification Certification is the process that only needs to answer the following unique question: can the write (transaction) be applied? based on unapplied earlier transactions such conflicts must come for other members/nodes
110 110 / 148 Certification Certification is the process that only needs to answer the following unique question: can the write (transaction) be applied? based on unapplied earlier transactions such conflicts must come for other members/nodes happens on every member/node
111 111 / 148 Certification Certification is the process that only needs to answer the following unique question: can the write (transaction) be applied? based on unapplied earlier transactions such conflicts must come for other members/nodes happens on every member/node should be deterministic on every node
112 112 / 148 Certification Certification is the process that only needs to answer the following unique question: can the write (transaction) be applied? based on unapplied earlier transactions such conflicts must come for other members/nodes happens on every member/node should be deterministic on every node results are not reported to the group
113 113 / 148 Certification Certification is the process that only needs to answer the following unique question: can the write (transaction) be applied? based on unapplied earlier transactions such conflicts must come for other members/nodes happens on every member/node should be deterministic on every node results are not reported to the group pass: enter in the apply queue
114 114 / 148 Certification Certification is the process that only needs to answer the following unique question: can the write (transaction) be applied? based on unapplied earlier transactions such conflicts must come for other members/nodes happens on every member/node should be deterministic on every node results are not reported to the group pass: enter in the apply queue fail: drop the transaction
115 115 / 148 Certification Certification is the process that only needs to answer the following unique question: can the write (transaction) be applied? based on unapplied earlier transactions such conflicts must come for other members/nodes happens on every member/node should be deterministic on every node results are not reported to the group pass: enter in the apply queue fail: drop the transaction serialized by the total order in GCS/XCOM + GTID
116 116 / 148 Certification Certification is the process that only needs to answer the following unique question: can the write (transaction) be applied? based on unapplied earlier transactions such conflicts must come for other members/nodes happens on every member/node should be deterministic on every node results are not reported to the group pass: enter in the apply queue fail: drop the transaction serialized by the total order in GCS/XCOM + GTID cost is based on trx size (# rows & # keys)
117 117 / 148 Certification Certification is the process that only needs to answer the following unique question: can the write (transaction) be applied? based on unapplied earlier transactions such conflicts must come for other members/nodes happens on every member/node should be deterministic on every node results are not reported to the group pass: enter in the apply queue fail: drop the transaction serialized by the total order in GCS/XCOM + GTID cost is based on trx size (# rows & # keys) first committer (and ack from majority) wins rule
118 118 / 148 Drawbacks of optimistic locking having a first-committer-wins system means conflicts will more likely happen when writing on multiple members with:
119 119 / 148 Drawbacks of optimistic locking having a first-committer-wins system means conflicts will more likely happen when writing on multiple members with: large transactions
120 120 / 148 Drawbacks of optimistic locking having a first-committer-wins system means conflicts will more likely happen when writing on multiple members with: large transactions long running transactions
121 121 / 148 Drawbacks of optimistic locking having a first-committer-wins system means conflicts will more likely happen when writing on multiple members with: large transactions long running transactions hotspot records
122 122 / 148 Default = Single Primary Mode By default, MySQL InnoDB Cluster runs in Single Primary Mode.
123 123 / 148 Default = Single Primary Mode By default, MySQL InnoDB Cluster runs in Single Primary Mode. mysql> show global variables like 'group_replication_single_primary_mode'; Variable_name Value group_replication_single_primary_mode ON
124 124 / 148 Default = Single Primary Mode By default, MySQL InnoDB Cluster runs in Single Primary Mode. mysql> show global variables like 'group_replication_single_primary_mode'; Variable_name Value group_replication_single_primary_mode ON In Single Primary Mode, a single member acts as the writable master (PRIMARY) and the rest of the members act as hot-standbys (SECONDARY). The group itself coordinates and configures itself automatically to determine which member will act as the PRIMARY, through a leader election mechanism.
125 125 / 148 Single Primary Mode - new in group_replication_member_weight: influence the primary member election in Single- Primary mode (from 0 to 100).
126 126 / 148 Single Primary Mode - new in group_replication_member_weight: influence the primary member election in Single- Primary mode (from 0 to 100). more visibility
127 127 / 148 Single Primary Mode - new in group_replication_member_weight: influence the primary member election in Single- Primary mode (from 0 to 100). more visibility mysql-sql> select * from performance_schema.replication_group_members; CHANNEL_NAME MEMBER_ID M_HOST PORT M_STATE MEMBER_ROLE M_VER gr_applier...-8d mysql ONLINE SECONDARY gr_applier...-be mysql ONLINE SECONDARY gr_applier...-a mysql ONLINE PRIMARY
128 128 / 148 New in MySQL Group Replication flow control variables now correctly permit you to have some members in a group that do not affect the minimum throughput of the flow-control mechanism
129 129 / 148 New in MySQL Group Replication flow control variables now correctly permit you to have some members in a group that do not affect the minimum throughput of the flow-control mechanism GCS instrumentation in Performance_Schema thread/group_rpl/thd_gcs_xcom_control
130 130 / 148 New in MySQL Group Replication flow control variables now correctly permit you to have some members in a group that do not affect the minimum throughput of the flow-control mechanism GCS instrumentation in Performance_Schema thread/group_rpl/thd_gcs_xcom_control Auto-setting Read Only when leaving the Group
131 131 / 148
132 132 / 148 MySQL Router (GA!) MySQL Router is lightweight middleware that provides transparent routing between your application and backend MySQL Servers. It can be used for a wide variety of use cases, such as providing high availability and scalability by effectively routing database traffic to appropriate backend MySQL Servers.
133 133 / 148 MySQL Router (GA!) MySQL Router is lightweight middleware that provides transparent routing between your application and backend MySQL Servers. It can be used for a wide variety of use cases, such as providing high availability and scalability by effectively routing database traffic to appropriate backend MySQL Servers. MySQL Router doesn t require any specific configuration. It configures itself automatically (bootstrap) using MySQL InnoDB Cluster s metadata.
134 134 / 148 MySQL Router (GA!) MySQL Router is lightweight middleware that provides transparent routing between your application and backend MySQL Servers. It can be used for a wide variety of use cases, such as providing high availability and scalability by effectively routing database traffic to appropriate backend MySQL Servers. MySQL Router doesn t require any specific configuration. It configures itself automatically (bootstrap) using MySQL InnoDB Cluster s metadata. The MySQL Router development will be focusing on sharding.
135 135 / 148 ProxySQL If you need some specific features that are not yet available in MySQL Router, like transparent R/W splitting, then you can use your software of choice. We are also collaborating with ProxySQL. ProxySQL has native support for Group Replication which makes it a good choice for advanced users.
136 136 / 148
137 137 / 148 MySQL Shell (GA!) The MySQL Shell is an interactive Javascript, Python, or SQL interface supporting development and administration for the MySQL Server and is a component of the MySQL Server. You can use the MySQL Shell to perform data queries and updates as well as various administration operations.
138 138 / 148 MySQL Shell (2) The MySQL Shell provides:
139 139 / 148 MySQL Shell (2) The MySQL Shell provides: Both Interactive and Batch operations
140 140 / 148 MySQL Shell (2) The MySQL Shell provides: Both Interactive and Batch operations Document and Relational Models
141 141 / 148 MySQL Shell (2) The MySQL Shell provides: Both Interactive and Batch operations Document and Relational Models CRUD Document and Relational APIs via scripting
142 142 / 148 MySQL Shell (2) The MySQL Shell provides: Both Interactive and Batch operations Document and Relational Models CRUD Document and Relational APIs via scripting Traditional Table, JSON, Tab Separated output results formats
143 143 / 148 MySQL Shell (2) The MySQL Shell provides: Both Interactive and Batch operations Document and Relational Models CRUD Document and Relational APIs via scripting Traditional Table, JSON, Tab Separated output results formats MySQL Standard and X Protocols
144 144 / 148 MySQL Shell (2) The MySQL Shell provides: Both Interactive and Batch operations Document and Relational Models CRUD Document and Relational APIs via scripting Traditional Table, JSON, Tab Separated output results formats MySQL Standard and X Protocols and more...
145 145 / 148 don t forget, this is a HA solution!
146 146 / 148 Demo?
147 147 / 148
148 148 / 148 Thank you! Any Questions? more at
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