The Ultimate Guide to High Availability with MariaDB
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MaxScale 24.02 Changelog

Changelog

MariaDB MaxScale 24.02

  • The default values of some readwritesplit parameters have been updated. The new default values are:

    • master_reconnection=true
    • master_failure_mode=fail_on_write
    • strict_tmp_tables=true
    • transaction_replay_timeout=30s

  • MariaDB-Monitor now requires MariaDB Server 10.4 or newer for failover/ switchover. Server 10.3 is end of life.

  • Server setting private_address added. Used for detecting and setting up replication. See MariaDB Monitor documentation for more information.

  • MariaDB-Monitor allows customization of some Mariabackup settings. See mariabackup_use_memory and mariabackup_parallel for more information.

  • Pam authentication now always checks account status. Previously, this check was not performed if MaxScale was configured for username mapping (authenticator_options=pam_backend_mapping=mariadb). This means that if username mapping is configured in the OS pam service config, the final username must be a valid user. This is similar to MariaDB Server behavior.

  • Support for the legacy SysV and Upstart system managers has been removed. In practice this change will not affect anything as all supported operating systems use SystemD as the system manager and MaxScale has long preferred it over the legacy systems.

  • The output of maxctrl show service now includes the statistics for the services.

  • The max_sescmd_history_length and avg_sescmd_history_length statistics in readwritesplit were moved into the core as service statistics. The session command history was moved into the MaxScale core in MaxScale 6 but the statistics were not updated to match this.

  • Several redundant schemarouter statistics have been either replaced by statistics that are found in the general service statistics output or have been removed if they were irrelevant.

    • longest_sescmd_chain replaced by max_sescmd_history_length.
    • queries replaced with routed_packets.
    • times_sescmd_limit_exceeded has been removed.
    • sescmd_percentage has been removed.
    • longest_session replaced with max_session_lifetime.
    • average_session replaced with avg_session_lifetime.
    • shortest_session has been removed.

  • admin_readwrite_hosts and admin_readonly_hosts added. These settings limit the allowed source addresses for admin (REST-API) connections. See here for more information.

  • The alter commands in MaxCtrl now allow modifications to the targets, servers, filters and cluster parameters for monitors and services. This makes it easier to define the exact set of servers that is to be used by a monitor or a service.

  • The causal_reads feature no longer requires modifying session_track_system_variables on the server. MaxScale adds last_gtid to the variable automatically for each session. Clients should not modify it manually.

  • The qlafilter now logs the execution of the binary protocol statements as text. This makes it so that for all execution of SQL, the query value in log_data will produce output.

  • The auth_all_servers parameter has been deprecated as it is now obsolete: the functionality that it enabled is automatically enabled by the schemarouter whenever it is used.

For more details, please refer to:

MariaDB MaxScale 23.08

  • The global setting skip_permission_checks has been deprecated and is ignored. Monitors start regardless of monitor user permissions.

  • The uppercase versions of the slave_selection_criteria parameter in readwritesplit have been deprecated. All runtime modifications to the parameters are now saved using the lowercase versions.

  • By default, readwritesplit will not replay transactions that are about to commit when transaction_replay is enabled. To retain the old behavior where transactions were always replayed, disable transaction_replay_safe_commit.

  • Readwritesplit will now retry queries with partially returned results if they are done inside a transaction and transaction_replay is enabled.

  • prune_sescmd_history now also performs history simplification by removing redundant executions of the same statement. This will reduce memory usage in the case when history repeats a small cycle of commands. One example of this is connection pools that prepare the connection with a small set of commands like SET NAMES and SET SQL_MODE.

  • Common configuration settings can now be specified in a separate section, to be included by other sections.

  • When changing the service password, the previous password will be retained and continue to be used if the new does not work.

  • Embedded newlines are removed from logged messages.

  • Schemarouter database map caches can be cleared with maxctrl call command schemarouter clear <service> where <service> is a service that uses the schemarouter.

  • Schemarouter now allows stale cache entries to be used while the database map cache is being updated. By default the entries are usable for 150 seconds after they have gone stale. This limit can be configured with the max_staleness parameter.

  • Added switchover-force command to MariaDB Monitor. This command performs a switchover even if primary server is unresponsive.

  • Switchover now uses a longer command timeout on the old master. This should remove the need for adjusting monitor setting backend_read_timeout to get switchover to work.

  • The NoSQL protocol now provides internal caching.

  • Additional metadata is sent in the connection handshake. For more information, refer to the parameter documentation.

  • The connection_timeout parameter was renamed to wait_timeout to make the naming of the parameters the same in MaxScale and MariaDB server. The old connection_timeout parameter is now an alias to wait_timeout and its use has been deprecated. If used, a warning will be logged that the parameter is deprecated.

  • The strip_db_esc parameter has been deprecated. The default behavior of stripping the escape characters is in all known cases the correct thing to do. Only broken legacy versions where the grants would be returned without backslash escaping would require this parameter to work.

  • The Xpand monitor is now region aware.

  • Passthrough authentication mode added to MariaDBAuth-module. See authenticator documentation for more information.

  • Added pam_mode=suid option to PamAuth module. This option separates the pam system library calls to a separate executable. See authenticator documentation for more information. test_pam_login tool updated to support this mode.

  • Added disk_space_ok option to MariaDB Monitor settings master_conditions and slave_conditions. Enabled by default in master_conditions. See monitor documentation for more information. Only available in MaxScale 23.08.5, 24.02.1 and later.

For more details, please refer to:

MariaDB MaxScale 23.02

  • A transition from the traditional master/slave terminology to the primary/replica terminology has been started. In the documentation and in the logging the transition has been made, but in configuration settings and command output the traditional terminology is still used. Conceptually, master/slave and primary/replica are completely interchangeable.

  • MariaDB Monitor now preserves the MASTER_USE_GTID-setting of a replica when redirecting one during switchover and failover. When starting a new replication connection on a previous replica, Slave_Pos is used. When starting a new replication connection on a previous primary, Current_Pos is used.

  • Added replication_custom_options-setting to both MariaDB Monitor and server. This setting enables e.g. setting SSL certificates for replication connections. See MariaDB Monitor documentation for more information.

  • Create-Backup and Restore-From-Backup commands added to MariaDBMonitor.

  • The csmon and auroramon monitors that were deprecated in 22.08.2 have been removed.

  • The obsolete maxctrl drain command has been removed. Use maxctrl set server <name> drain to use the built-in draining mechanism.

  • The maxctrl cluster commands have been removed. Use the built-in configuration synchronization to synchronize the configurations of multiple MaxScale instances.

  • The REST-API is now supports ODBC-type connections in the /sql endpoints. For more information, refer to the SQL resource documentation.

  • The REST-API query endpoint now supports asynchronous query execution using the async=true option.

  • The new /sql/:id/etl endpoints allow ETL operations to be done from ODBC data sources into MariaDB servers. For more information on the new API functions, refer to the SQL resource documentation.

  • The number of routing threads MaxScale uses can now be changed at runtime.

  • The Audit-Log allows all REST-API calls to be logged.

  • MaxScale now supports Xpand parallel replication streams that go through MaxScale.

  • Authentication can now be enabled when Redis is used as the cache storage.

  • SSL/TLS can now be used in the communication between MaxScale and Redis when Redis is used as the storage for the cache.
  • Some Cache configuration parameters, most notable the rules, can now be changed at runtime.
  • Support for inbound proxy protocol added.
  • Ed25519Auth-plugin added. The plugin enables authentication with the MariaDB Server ed25519 authentication plugin.

  • MaxGUI Query Editor has been renamed to "Workspace," and its internal storage key has been modified. As a result, the query history, snippets, and user preferences settings are restored to their default values.

  • The redundant options for create server and create listener that were deprecated in 22.08 have been removed in MaxScale 23.02. The use of explicit options has been superseded by the use of key=value parameters in all create commands.

For more details, please refer to:

MariaDB MaxScale 22.08

  • Sessions can now be restarted so that added server are taken into use.
  • Sessions can now be killed using maxctrl.
  • MariaDBMonitor can use Mariabackup to clone the contents of a server.
  • MariaDBMonitor can issue ColumnStore commands similar to CSMon
  • MariaDBMonitor settings ignore_external_masters, detect_replication_lag detect_standalone_master, detect_stale_master and detect_stale_slave have been removed. The first two were ineffective, the latter three are replaced by master_conditions and slave_conditions.
  • A new Query Rewrite filter, using which queries can be rewritten based upon a template, has been added.
  • MaxScale no longer logs to both the SystemD journal and MaxScale log by default: the default value of syslog was changed from true to false to reduce the amount of redundant log messages that are logged. To retain the old behavior of logging to both MaxScale's own files and to the SystemD journal, add syslog=true under the [maxscale] section.
  • The dbfwfilter module that was deprecated in version 6 has now been removed.
  • MaxGUI Query Editor has changed the type of browser storage from local storage to IndexedDB. As the result, query history, favorite, and configuration are reset. Apart from that, query favorite was renamed to query snippets allowing to quickly insert the query to the editor by typing its prefix. See MaxGUI tutorial Using-MaxGUI-Tutorial
  • The Xpand monitor now handles group change explicitly.
  • The Maintenance|Drain state of a server is now synchronized between multiple MaxScale instances if configuration synchronization is enabled.
  • Causal reads now supported in a multi-MaxScale setup.
  • The csmon and auroramon monitors are deprecated in 22.08.2 and will be removed in 23.02.0.

For more details, please refer to:

MariaDB MaxScale 21.06

NOTE MaxScale 6.4 was renamed to 21.06 in May 2024. Thus, what would have been released as 6.4.16 in June, was released as 21.06.16. The purpose of this change is to make the versioning scheme used by all MaxScale series identical. 21.06 denotes the year and month when the first 6 release was made.

  • Added multiplex_timeout. It sets the time a session can wait for a backend connection to become available when using connection sharing (i.e. idle_session_pool_time).

For more details, please refer to:

MariaDB MaxScale 6.3

  • Nosqlprotocol now supports both SSL and authentication.
  • A large number of client connections can now share a smaller number of backend connections.
  • MaxGUI now shows which MaxScale node is in control when cooperative monitoring is enabled.
  • Filtering can now be used in the KafkaCDC router.
  • The user is now informed if runtime changes are made to configuration objects that are defined in static configuration files.

For more details, please refer to:

MariaDB MaxScale 6.2

  • Significant improvements and feature additions to MaxGUI
  • Significant improvements to nosqlprotocol
  • Transaction Performance Monitoring Filter functionality moved to Qlafilter
  • Most filters can now be reconfigured at runtime
  • Synchronous mode for the Tee filter
  • New list queries command for MaxCtrl that lists all active queries
  • MaxScale can read client user accounts from a file and map them to backend users. See service setting user_accounts_file and listener setting user_mapping_file for more information.

For more details, please refer to:

MariaDB MaxScale 6.1

  • The versioning scheme has changed; earlier this would have been version 2.6.
  • A nosqlprotocol protocol module that implements the MongoDB® wire protocol has been introduced.
  • The Columnstore monitor is now exclusively intended for Columnstore version 1.5.
  • The Columnstore monitor can now automatically adapt to changes in the cluster configuration.
  • The Database Firewall filter has been deprecated.
  • If extra_port is defined for a server, it's used by default for monitor and user account manager connections. Normal port is used if the extra-port connection fails due to too low extra_max_connections-setting on the backend.
  • The deprecated required and disabled values for the ssl parameter have been removed.
  • Backend connection multiplexing added. See idle_session_pool_time for more information.
  • Defaults for maxctrl can now be specified in the file ~/maxctrl.cnf
  • PAM Authenticator can map PAM users to MariaDB users.
  • MariaDB-Monitor can launch monitor script when slave server exceeds replication lag limit (script_max_replication_lag).
  • MariaDB-Monitor can disable read_only on master server (enforce_writable_master).
  • A graphical user interface SQL queries tool for writing, running SQL queries and visualizing the results has been introduced.

For more details, please refer to:

MariaDB MaxScale 2.5

  • MaxAdmin has been removed.
  • MaxGUI, a new browser based tool for configuring and managing MaxScale is introduced.
  • MaxInfo-router and the related httpd-protocol have been removed.
  • Server weights have been removed.
  • Services can now directly route to other services with the help of the target parameter.
  • Server parameters protocol and authenticator have been deprecated. Any definitions are ignored.
  • Listeners support multiple authenticators.
  • The replication lag of a slave server must now be less than max_slave_replication_lag whereas in older versions the replication lag had to be less than or equal to the configured limit.
  • The global settings auth_read_timeout and auth_write_timeout have been deprecated. Any definitions are ignored.
  • The Columnstore monitor is now capable of monitoring Columnstore 1.5 in addition to 1.0 and 1.2.
  • MariaDB-Monitor supports cooperative monitoring. See cooperative monitoring for more information.
  • The MaxScale cache can now be shared between two MaxScale instances, in which case either memcached or Redis can be used as cache storage. Further, the cache can now also perform table level invalidations and be specific to a particular user.
  • A completely new binlog router implementation.
  • New routers, mirror and kafkacdc.
  • Service-to-service routing is now possible with the targets parameter.
  • TLS CRL and peer host verification support.
  • Multiple modes of operation for causal_reads.

For more details, please refer to:

MariaDB MaxScale 2.4

  • A Clustrix specific monitor has been added.
  • A new router, Smart Router, capable of routing a query to different backends depending on the characteristics of the query has been added.
  • Transaction replaying is now performed also in conjunction with server initiated transaction rollbacks.
  • Names starting with @@ are reserved for use by MaxScale.
  • Names can no longer contain whitespace.
  • Servers can now be drained.
  • The servers of a service can now be defined using a monitor.
  • Durations can now be specified as hours, minutes, seconds or milliseconds.
  • MaxCtrl commands list sessions, show sessions and show session <id> support reverse DNS lookup of client addresses. The conversion is activated by adding the --rdns-option to the command.
  • The following MariaDB-Monitor settings have been removed and cause a startup error if defined: mysql51_replication, multimaster and allow_cluster_recovery. The setting detect_replication_lag is deprecated and ignored.
  • enforce_simple_topology-setting added to MariaDB-Monitor.
  • The mqfilter has been deprecated.

For more details, please refer to:

MariaDB MaxScale 2.3

  • Runtime Configuration of the Cache
  • User Specified Syslog Facility and Level for Authentication Errors
  • config reload removed from MaxAdmin (was deprecated in 2.2)
  • MariaDBMonitor features added, modified and removed
  • A Comment filter has been added.
  • Services and filters can be created at runtime via the REST API
  • Runtime router reconfiguration is now possible
  • New Throttle filter that replaces and extends on the limit_queries functionality
  • MaxCtrl
  • The create monitor command now accepts a list of key-value parameters
  • The new drain server drains the server of connections
  • A new interactive input mode was added
  • Readwritesplit
  • Automatic transaction replay allows transactions to be migrated between servers
  • Master connections can now be re-opened
  • Writes with autocommit enabled can be automatically retried
  • Consistent reads on slaves via MASTER_GTID_WAIT
  • Transaction load balancing for normal transactions
  • Support for runtime router reconfiguration
  • A new load balancing method: ADAPTIVE_ROUTING
  • Experimental resultset concatenation router, cat
  • The schema router is now capable of table family sharding.
  • The binlog router can now automatically switch to secondary masters when replicating from a Galera cluster in case the primary master goes down.
  • MaxScale now has a systemd compatible watchdog.
  • Server setting authenticator_options is no longer used and any value is ignored.

For more details, please refer to:

MariaDB MaxScale 2.2

  • Limited support from Pluggable Authentication Modules (PAM).
  • Proxy protocol support for backend connections.
  • REST-API for obtaining information about and for manipulating the resources of MaxScale.
  • MaxCtrl, a new command line client for administering MaxScale implemented in terms of the REST-API.
  • Firewall can now prevent the use of functions in conjunction with certain columns.
  • Parser of MaxScale extended to support window functions and CTEs.
  • Parser of MaxScale extended to support PL/SQL compatibility features of upcoming 10.3 release.
  • Prepared statements are now parsed and the execution of read only ones will be routed to slaves.
  • Server states are persisted, so in case of crash and restart MaxScale has the correct server state quicker.
  • Monitor scripts are executed synchronously, so they can safely perform actions that change the server states.
  • The Masking filter can now both obfuscate and partially mask columns.
  • Binlog router supports MariaDB 10 GTID at both ends.
  • KILL CONNECTION can now be used through MaxScale.
  • Environment variables can now be used in the MaxScale configuration file.
  • By default, MaxScale can no longer be run as root.
  • The MySQL Monitor is now capable of performing failover and switchover of the master. There is also limited capability for rejoining nodes.

For more details, please refer to:

MariaDB MaxScale 2.1

  • MariaDB MaxScale is licensed under MariaDB BSL 1.1.
  • Hierarchical configuration files are now supported.
  • Logging is now performed in a way compatible with logrotate(8).
  • Persistent connections are reset upon reuse.
  • Galera monitor now consistently chooses the same node as master.
  • Galera Monitor can set the preferred donor nodes list.
  • The configuration can now be altered dynamically and the changes are persisted.
  • There is now a monitor for Amazon Aurora clusters.
  • MySQL Monitor now has a multi-master mode.
  • MySQL Monitor now has a failover mode.
  • Named Server Filter now supports wildcards for source option.
  • Binlog Server can now be configured to encrypt binlog files.
  • New filters, cache, ccrfilter, insertstream, masking, and maxrows are introduced.
  • GSSAPI based authentication can be used
  • Prepared statements are now in the database firewall filtered exactly like non-prepared statements.
  • The firewall filter can now filter based on function usage.
  • MaxScale now supports IPv6

For more details, please refer to:

MariaDB MaxScale 2.0

  • MariaDB MaxScale is licensed under MariaDB BSL.
  • SSL can be used in the communication between MariaDB MaxScale and the backend servers.
  • The number of allowed connections can explicitly be throttled.
  • MariaDB MaxScale can continue serving read request even if the master has gone down.
  • The security of MaxAdmin has been improved; Unix domain sockets can be used in the communication with MariaDB MaxScale and the Linux identity can be used for authorization.
  • MariaDB MaxScale can in real time make binlog events available as raw AVRO or as JSON objects (beta level functionality).

For more details, please refer to:

MariaDB MaxScale 1.4

  • Authentication now allows table level resolution of grants. MaxScale service users will now need SELECT privileges on mysql.tables_priv to be able to authenticate users at the database and table level.
  • Firewall filter allows whitelisting.
  • Client side SSL works.

For more details, please refer to

MariaDB MaxScale 1.3

  • Added support for persistent backend connections
  • The binlog server is now an integral component of MariaDB MaxScale.
  • The logging has been changed; instead of different log files there is one log file and different message priorities.

For more details, please refer to MariaDB MaxScale 1.3 Release Notes

MariaDB MaxScale 1.2

  • Logfiles have been renamed. The log names are now named error.log, messages.log, trace.log and debug.log.

MariaDB MaxScale 1.1.1

  • Schemarouter now also allows for an upper limit to session commands.
  • Schemarouter correctly handles SHOW DATABASES responses that span multiple buffers.
  • Readwritesplit and Schemarouter now allow disabling of the session command history.

MariaDB MaxScale 1.1

NOTE: MariaDB MaxScale default installation directory has changed to /usr/local/mariadb-maxscale and the default password for MaxAdmin is now ´mariadb´.

  • New modules added
    • Binlog router
    • Firewall filter
    • Multi-Master monitor
    • RabbitMQ logging filter
    • Schema Sharding router
  • Added option to use high precision timestamps in logging.
  • Readwritesplit router now returns the master server's response.
  • New readwritesplit router option added. It is now possible to control the amount of memory readwritesplit sessions will consume by limiting the amount of session modifying statements they can execute.
  • Minimum required CMake version is now 2.8.12 for package building.
  • Session idle timeout added for services. More details can be found in the configuration guide.
  • Monitor API is updated to 2.0.0. Monitors with earlier versions of the API no longer work with this version of MariaDB MaxScale.
  • MariaDB MaxScale now requires libcurl and libcurl development headers.
  • Nagios plugins added.
  • Notification service added.
  • Readconnrouter has a new "running" router_option. This allows it to use any running server as a valid backend server.
  • Database names can be stripped of escape characters with the strip_db_esc service parameter.
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