Automated Continuous AlloyDB Replication to Apache Cassandra

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CData Sync



Use CData Sync for automated, continuous, customizable AlloyDB replication to Apache Cassandra.

Always-on applications rely on automatic failover capabilities and real-time data access. CData Sync integrates live AlloyDB data into your Apache Cassandra instance, allowing you to consolidate all of your data into a single location for archiving, reporting, analytics, machine learning, artificial intelligence and more.

Configure Cassandra as a Replication Destination

Using CData Sync, you can replicate AlloyDB data to Apache Cassandra. To add a replication destination, navigate to the Connections tab.

  1. Click Add Connection.
  2. Select Apache Cassandra as a destination.
  3. Enter the necessary connection properties. CData Sync supports Basic authentication with login credentials and the additional authentication features of DataStax Enterprise (DSE) Cassandra. The following sections detail connection properties your authentication method may require.

    You need to set AuthScheme to the value corresponding to the authenticator configured for your system. You specify the authenticator in the authenticator property in the cassandra.yaml file. This file is typically found in /etc/dse/cassandra or through the DSE Unified Authenticator on DSE Cassandra.

    Basic Authentication

    Basic authentication is supported through Cassandra's built-in default PasswordAuthenticator.

    • Set the AuthScheme property to 'BASIC' and set the User and Password properties.
    • In the cassandra.yaml file, set the authenticator property to 'PasswordAuthenticator.'

    Kerberos Authentication

    Kerberos authentication is supported through DataStax Enterprise Unified Authentication.

    • Set the AuthScheme property to 'KERBEROS' and set the User and Password properties.
    • Set the KerberosKDC, KerberosRealm, and KerberosSPN properties.
    • In the cassandra.yaml file, set the authenticator property to "com.datastax.bdp.cassandra.auth.DseAuthenticator."
    • Modify the authentication_options section in the dse.yaml file, specifying the default_schema and other_schemas properties as 'kerberos.'
    • Modify the kerberos_options section in the dse.yaml file, specifying the keytab, service_principle, http_principle and qop properties.

    LDAP Authentication

    LDAP authentication is supported through DataStax Enterprise Unified Authentication.

    • Set the AuthScheme property to 'LDAP' and set the User and Password properties.
    • In the cassandra.yaml file, set the authenticator property to "com.datastax.bdp.cassandra.auth.DseAuthenticator."
    • Modify the authentication_options section in the dse.yaml file, specifying the default_schema and other_schemas properties as 'ldap.'
    • Modify the ldap_options section in the dse.yaml file, specifying the server_host, server_port, search_dn, search_password, user_search_base, and user_search_filter properties.

    Using PKI

    You can specify a client certificate to authenticate CData Sync with SSLClientCert, SSLClientCertType, SSLClientCertSubject, and SSLClientCertPassword.

  4. Click Test Connection to ensure that the connection is configured properly.
  5. Click Save Changes.

Configure the AlloyDB Connection

You can configure a connection to AlloyDB from the Connections tab. To add a connection to your AlloyDB account, navigate to the Connections tab.

  1. Click Add Connection.
  2. Select a source (AlloyDB).
  3. Configure the connection properties.

    The following connection properties are usually required in order to connect to AlloyDB.

    • Server: The host name or IP of the server hosting the AlloyDB database.
    • User: The user which will be used to authenticate with the AlloyDB server.
    • Password: The password which will be used to authenticate with the AlloyDB server.

    You can also optionally set the following:

    • Database: The database to connect to when connecting to the AlloyDB Server. If this is not set, the user's default database will be used.
    • Port: The port of the server hosting the AlloyDB database. This property is set to 5432 by default.

    Authenticating with Standard Authentication

    Standard authentication (using the user/password combination supplied earlier) is the default form of authentication.

    No further action is required to leverage Standard Authentication to connect.

    Authenticating with pg_hba.conf Auth Schemes

    There are additional methods of authentication available which must be enabled in the pg_hba.conf file on the AlloyDB server.

    Find instructions about authentication setup on the AlloyDB Server here.

    Authenticating with MD5 Authentication

    This authentication method must be enabled by setting the auth-method in the pg_hba.conf file to md5.

    Authenticating with SASL Authentication

    This authentication method must be enabled by setting the auth-method in the pg_hba.conf file to scram-sha-256.

    Authenticating with Kerberos

    The authentication with Kerberos is initiated by AlloyDB Server when the ∏ is trying to connect to it. You should set up Kerberos on the AlloyDB Server to activate this authentication method. Once you have Kerberos authentication set up on the AlloyDB Server, see the Kerberos section of the help documentation for details on how to authenticate with Kerberos.

  4. Click Connect to ensure that the connection is configured properly.
  5. Click Save Changes.

Configure Replication Queries

CData Sync enables you to control replication with a point-and-click interface and with SQL queries. For each replication you wish to configure, navigate to the Jobs tab and click Add Job. Select the Source and Destination for your replication.

Replicate Entire Tables

To replicate an entire table, click Add Tables in the Tables section, choose the table(s) you wish to replicate, and click Add Selected Tables.

Customize Your Replication

You can use the Columns and Query tabs of a task to customize your replication. The Columns tab allows you to specify which columns to replicate, rename the columns at the destination, and even perform operations on the source data before replicating. The Query tab allows you to add filters, grouping, and sorting to the replication.

Schedule Your Replication

In the Schedule section, you can schedule a job to run automatically, configuring the job to run after specified intervals ranging from once every 10 minutes to once every month.

Once you have configured the replication job, click Save Changes. You can configure any number of jobs to manage the replication of your AlloyDB data to Apache Cassandra.