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MySQL Metadata Store
Make sure to include mysql-metadata-storage as an extension.
Installing the MySQL connector library
This extension uses Oracle's MySQL JDBC driver which is not included in the Druid distribution and must be installed separately. There are a few ways to obtain this library:
- It can be downloaded from the MySQL site at: https://dev.mysql.com/downloads/connector/j/
- It can be fetched from Maven Central at: http://central.maven.org/maven2/mysql/mysql-connector-java/5.1.38/mysql-connector-java-5.1.38.jar
- It may be available through your package manager, e.g. as
libmysql-javaon APT for a Debian-based OS
This should fetch a JAR file named similar to 'mysql-connector-java-x.x.xx.jar'.
Copy or symlink this file to extensions/mysql-metadata-storage under the distribution root directory.
Setting up MySQL
- Install MySQL
Use your favorite package manager to install mysql, e.g.:
- on Ubuntu/Debian using apt
apt-get install mysql-server - on OS X, using Homebrew
brew install mysql
Alternatively, download and follow installation instructions for MySQL Community Server here: http://dev.mysql.com/downloads/mysql/
- Create a druid database and user
Connect to MySQL from the machine where it is installed.
> mysql -u root
Paste the following snippet into the mysql prompt:
-- create a druid database, make sure to use utf8mb4 as encoding
CREATE DATABASE druid DEFAULT CHARACTER SET utf8mb4;
-- create a druid user, and grant it all permission on the database we just created
GRANT ALL ON druid.* TO 'druid'@'localhost' IDENTIFIED BY 'diurd';
- Configure your Druid metadata storage extension:
Add the following parameters to your Druid configuration, replacing <host>
with the location (host name and port) of the database.
druid.extensions.loadList=["mysql-metadata-storage"]
druid.metadata.storage.type=mysql
druid.metadata.storage.connector.connectURI=jdbc:mysql://<host>/druid
druid.metadata.storage.connector.user=druid
druid.metadata.storage.connector.password=diurd
Note: the metadata storage extension is not packaged within the main Druid tarball; it is packaged in a separate tarball that can be downloaded from here. You can also get it using pull-deps, or you can build it from source code; see Build from Source.
Encrypting MySQL connections
This extension provides support for encrypting MySQL connections. To get more information about encrypting MySQL connections using TLS/SSL in general, please refer to this guide.
Configuration
| Property | Description | Default | Required |
|---|---|---|---|
druid.metadata.mysql.ssl.useSSL |
Enable SSL | false |
no |
druid.metadata.mysql.ssl.clientCertificateKeyStoreUrl |
The file path URL to the client certificate key store. | none | no |
druid.metadata.mysql.ssl.clientCertificateKeyStoreType |
The type of the key store where the client certificate is stored. | none | no |
druid.metadata.mysql.ssl.clientCertificateKeyStorePassword |
The Password Provider or String password for the client key store. | none | no |
druid.metadata.mysql.ssl.verifyServerCertificate |
Enables server certificate verification. | false | no |
druid.metadata.mysql.ssl.trustCertificateKeyStoreUrl |
The file path to the trusted root certificate key store. | Default trust store provided by MySQL | yes if verifyServerCertificate is set to true and a custom trust store is used |
druid.metadata.mysql.ssl.trustCertificateKeyStoreType |
The type of the key store where trusted root certificates are stored. | JKS | yes if verifyServerCertificate is set to true and keystore type is not JKS |
druid.metadata.mysql.ssl.trustCertificateKeyStorePassword |
The Password Provider or String password for the trust store. | none | yes if verifyServerCertificate is set to true and password is not null |
druid.metadata.mysql.ssl.enabledSSLCipherSuites |
Overrides the existing cipher suites with these cipher suites. | none | no |
druid.metadata.mysql.ssl.enabledTLSProtocols |
Overrides the TLS protocols with these protocols. | none | no |