Version End of Life. 31 October 2018
Release Notes 4.0 is a major release which is designed to provide integration between Release Notes 4.0 and Tungsten Replicator 4.0. Providing MySQL clustering support, while providing replication for MySQL, Oracle, and out to datawarehouses such as HP Vertica, Amazon Redshift and Hadoop.
For more information on replicating data out of a cluster, see Replicating Data from a Cluster into MySQL (in [Continuent Tungsten 4.0 Manual]).
The following issues may affect the operation of Continuent Tungsten and should be taken into account when deploying or updating to this release.
For security purposes you should ensure that you secure the following areas of your deployment:
Ensure that you create a unique installation and deployment user, such as tungsten, and set the correct file permissions on installed directories. See Directory Locations and Configuration (in [Continuent Tungsten 4.0 Manual]).
When using ssh and/or SSL, ensure that the ssh key or certificates are suitably protected. See SSH Configuration (in [Continuent Tungsten 4.0 Manual]).
Use a firewall, such as iptables to protect the network ports that you need to use. The best solution is to ensure that only known hosts can connect to the required ports for Continuent Tungsten. For more information on the network ports required for Continuent Tungsten operation, see Network Ports (in [Continuent Tungsten 4.0 Manual]).
If possible, use authentication and SSL connectivity between hosts to protext your data and authorisation for the tools used in your deployment. See Deploying SSL Secured Replication and Administration (in [Continuent Tungsten 4.0 Manual]) for more information.
When using read-only connectors, and making use of explicit transactions (i.e. with autocommit disabled), queries may be routed to the master, rather than a slave.
Under certain circumstances, the rsync process can randomly fail during the installation/ deployment process when using the staging method of deployment. The error code returned by rsync may be 12 or 23.
The error is transient and non-specific and deployment should be retried.
tpm (in [Continuent Tungsten 4.0 Manual]) now correctly checks the functionality of the 'echo' protocol to validate 'echo'.
Force a new directory under /opt/continuent/releases during tpm update (in [Continuent Tungsten 4.0 Manual]) if components are being added/removed.
Add manager status command to cctrl (in [Continuent Tungsten 4.0 Manual]).
Update tpm (in [Continuent Tungsten 4.0 Manual]) to force the replication timezone to GMT.
In certain situations the Manager is left in an unreliable state and gets confused about which driver to indicate to the Connector to use. For more information, please see FAQ: How do I fix the mysql-connectorj to drizzle MySQL driver bug which prevents my application from connecting through the Connector? (in [Continuent Tungsten 4.0 Manual]).
Attempting concurrent operations in cctrl (in [Continuent Tungsten 4.0 Manual]) generates an exception.
Using the recover (in [Continuent Tungsten 4.0 Manual]) command does a gratuitous change of policy.