Prerequisites

• MySQL version ≥ 5.7
• MySQL binlog enabled
• Streamkap user and role

Granting Privileges

It's recommended to create a separate user and role for Streamkap to access your MySQL database. Below is an example script that does that.

-- Replace { ... } placeholders as required

-- Identify version
SHOW VARIABLES LIKE 'VERSION';

--On MySQL version 5.6 to 8.0
CREATE USER streamkap_user@'%' IDENTIFIED BY '{password}';

--On MySQL version 8.0+
CREATE USER streamkap_user@'%' IDENTIFIED WITH mysql_native_password BY '{password}';

--Grant Permissions
GRANT REPLICATION CLIENT, RELOAD, SHOW DATABASES, REPLICATION SLAVE ON *.* TO streamkap_user@'%';

--Grant Select on all schemas needed
GRANT SELECT ON {schema}.* TO 'streamkap_user';

Enable Snapshots

You can perform ad-hoc snapshots of all or some of your tables in the Streamkap app. See Snapshots & Backfilling for more information.

To enable this feature, there are 2 methods available for MySQL databases.

Method 1: Enable GTID (Recommended)

🚧

GTID mode is only available in MySQL version ≥ 5.6.5

Global transaction identifiers (GTIDs) uniquely identify transactions that occur on a server within a cluster. Though not required, using GTIDs simplifies replication and enables you to more easily confirm if primary and replica servers are consistent as well as carry out incremental snapshots.

Set up following these instructions. Ensure you follow the guide for your version Read replicas in Azure Database for MySQL | Global transaction identifiers (GTID)

👍

This method is recommended if you cannot create and grant Streamkap read/write privileges on a 'signal' table (method 2) for any reason. It's the equivalent of a 'read only' connection.

Method 2: Create a table in the source database

If you cannot enable GTID mode, you will need to create the table and give permissions to the streamkap_user. Streamkap will use this collection for managing snapshots.

❗️

Please create the signal table with the name streamkap_signal in a new schema called streamkap. It will not be recognised if given another name.

-- Create the schema
CREATE SCHEMA streamkap;

CREATE TABLE streamkap_signal (
  id VARCHAR(255) PRIMARY KEY, 
  type VARCHAR(32) NOT NULL, 
  data VARCHAR(2000) NULL
);

GRANT SELECT, UPDATE, INSERT ON streamkap.streamkap_signal TO streamkap_user;

Enable binary logging / history mode for read reply

If you are connecting to a read replica, you need to enable binary logging / history mode.

1. Connect to your read replica with SUPER privileges.
2. If the slave_parallel_workers value is 0, you can skip further steps here.
3. If the slave_parallel_workers value is not 0, run the following:

SET GLOBAL slave_parallel_type = 'LOGICAL_CLOCK';  
SET GLOBAL slave_preserve_commit_order = 1;

Connect to your master instance with SUPER privileges

SET GLOBAL binlog_order_commits = 1;

Consider Access Restrictions

• Visit Connection Options to ensure Streamkap can reach your database

Setup MySQL Connector in Streamkap

• Go to Sources and click Create New
• Input
  • Name for your Connector
  • Hostname
  • Port (Default 3306)
  • Username (Username you chose earlier, our scripts use streamkap_user)
  • Password
  • Heartbeat - Required for low volume connectors. See MySQL Heartbeats
  • Connection Timezone - The timezone of your database

  • 📘

    Timezone conversion

    MySQL converts TIMESTAMP values from the current time zone to UTC for storage, and back from UTC to the current time zone for retrieval. By default, the current time zone for each connection is the database server's time zone but this option allows you to override that.

    As long as the time zones remain the same, you get back the same value you store.

    We recommend using the default SERVER option which attempts to detect the session time zone from the values configured on the MySQL server session variables 'time_zone' or 'system_time_zone'. It also reduces the chance of problems with daylight savings adjustment 'fall back' and 'spring forward'.

    If either time zones change, an ad-hoc snapshot is recommended so your source and destination timestamps are consistent.

  • Use GTID
    • If your database is using GTID, leave this as 'Yes'. See Enable GTID for more information.
    • If 'No', please ensure you create the signal table as described here
      • Signal Table Database: Streamkap will use a table in this database to manage snapshots e.g. public. See Enable Snapshots for more information
• Connect via SSH Tunnel. See SSH Tunnel
• Advanced Parameters
  • Snapshot Mode (Default When Needed) See MySQL Snapshot Modes for more information
  • Represent Binary Data As (Default bytes)
  • Snapshot Chunk Size (Default 1024) - This is the number of rows read at a time when snapshotting. This is a low safe value. As a guide, if you have 100m + rows of data you may want to move this to 5120. If you have 1bn then a higher number still will allow you to backfill faster.
  • Max Batch Size (Default 2048) - A value that specifies the maximum size of each batch of events that the connector processes. Only increase if experiencing lag
• Add Schemas/Tables. Can also bulk upload here. The format is a simple list of each schema or table per row saved in csv format without a header.
• Click Save
  The connector will take approximately 1 minute to start processing data.