MariaDB MaxScale 6.0 Release Notes -- 2021-06-30
MariaDB MaxScale 6.0.0 Release Notes -- 2021-06-30
The versioning scheme has changed; the major number will be increased at the yearly major release, the minor number will be increased at intermediate scheduled releases and the patch number whenever a maintenance release is made. Each major release is separately maintained.
According to the old scheme, this MaxScale release would have been called 2.6 and the version number would have been 2.6.0.
Release 6.0.0 is a Beta release.
This document describes the changes in release 6, when compared to release 2.5.
For any problems you encounter, please consider submitting a bug report on our Jira.
MXS-3107 Columnstore monitor
The Columnstore monitor that in this release only supports Columnstore version 1.5, is now capable of adjusting itself automatically to any changes in the the cluster. In the configuration it is only specified a node using which the monitor get in contact with the cluster, but after that the monitor autonomously figures out the cluster configuration and automatically adapts to any changes in the configuration. For more details, please consult the monitor documentation.
causal_reads and Prepared Statements
causal_reads feature now supports binary protocol prepared statements. For
more information, refer to the
MXS-2838 Hintfilter and Prepared Statements
The hintfilter now supports routing hints in binary protocol prepared statements. For more information, refer to the hintfilter documentation.
MXS-3219 Galera Server States
The servers monitored by a galeramon will now also display extra status
information in the REST API output regarding the server state. MaxCtrl will
automatically combine this for the output of
maxctrl list servers.
MXS-1245 Readwritesplit Statement Pipelining
Readwritesplit now supports "pipelined" execution of write statements. This significantly improves the performance of batch data loading with connectors that use it (e.g. the MariaDB JDBC and Node.JS connectors).
MXS-3128 Runtime Alteration of TLS Parameters
The TLS parameters for listeners and servers can now be modified at runtime. Previously the parameters were only modifiable when the object was being created.
MXS-3537 Default Value of
The default value of
threads was changed from 1 to
disabled values for the
ssl parameter have been
removed. Replace them with
Database Firewall filter
The filter is deprecated in MaxScale 6 and will be removed in MaxScale 7.
Multi-line Configuration Parameters
The ability to define a single configuration parameter on multiple lines is deprecated and will be removed in MaxScale 7.
nosqlprotocol protocol module
This module implements a subset of the MongoDB® wire protocol and
transparently converts MongoDB commands into the equivalent SQL
statements that subsequently are executed on a MariaDB server. This
allows client applications utilizing some MongoDB client library to
use a MariaDB server as backend. As the conversion is performed in
the protocol module, this functionality can be used together with
all MaxScale routers and filters. Please see the
documentation for more information.
MXS-3482 Defaults can be specified for
If the file
~/.maxctrl.cnf exists, maxctrl will use any values in the section
[maxctrl] as defaults for command line arguments. Please see the
documentation for details.
MXS-3411 TLS and Authentication for Kafka
The KafkaCDC as well as the new KafkaImporter both new support TLS and basic SASL authentication for Kafka.
For more information, refer to the KafkaCDC and KafkaImporter documentation.
MXS-3178 REST API Log Interface
The REST API is now able to deliver the MaxScale logs both as a normal HTTP resource as well as WebSocket stream. For more information, refer to the REST API documentation.
MXS-3108 Session Alteration
The logging options for filters can be changed at runtime with
filter and the filters of a session can be modified with
session-filters. For more information, refer to the MaxCtrl
documentation as well as the REST API
MXS-2806 Stopping of Individual Listeners
Individual listeners can now be stopped with the
maxctrl stop listener
command. The new
--force option added to the
stop commands can be used to
force all open connections to be closed when the associated object is stopped.
MXS-2808 Configuration Synchronization
A new configuration synchronization feature has been added to MaxScale. This
feature allows multiple MaxScale instances to share a configuration file that is
synchronized via the database cluster monitored by MaxScale. For more
information, refer to the
MXS-2588 Data Ingestion From Kafka
The KafkaImporter module can be used to import JSON data from Kafka into MariaDB. For more information, refer to the KafkaImporter documentation.
MXS-2351 Prepared Statement Caching
Readwritesplit is now capable of caching prepared statements for individual
sessions. For more information, refer to the
documentation for the
MXS-1687 KafkaCDC and Avrorouter Failover
The KafkaCDC and Avrorouter modules now support automated failover of the replication stream when configured to replicate from servers or from a cluster. For more information, refer to the KafkaCDC and Avrorouter documentation.
MXS-2748 Session command history to RWS
Readwritesplit statistics now has two new entries:
These are helpful when tuning
max_sescmd_history to avoid session command history
to be too short, leading to potential inconsistencies, or to become too large,
leading to wasted memory.
MXS-3091 Restrict RCR reads to slaves
Readconnroute has a new option
master_accept_reads similar to the one in Readwritesplit.
master_accept_reads=false RCR will not route reads to the current master.
MXS-3257 SQL queries tool
A graphical user interface tool to write, run SQL queries and visualize the results. For more information, refer to the MAXGUI documentation.
MXS-3154 Logs viewer
A graphical user interface for reading and filtering MaxScale's log. For more information, refer to the MAXGUI documentation.
MXS-2723 Can launch monitor script when slave server exceeds replication lag limit. See documentation for more information.
MXS-3268 Can disable read_only on master if it's set. See documentation for more information.
MXS-3475 PAM user mapping
PAM-Authenticator supports mapping incoming PAM users to MariaDB users. See documentation for more information.
- MXS-3592 MaxCtrl object creation doesn't convert values to JSON
- MXS-3537 Default value of threads is not optimal
- MXS-3515 COM_STMT_EXECUTE with ID -1 isn't handled correctly
- MXS-3443 Query performance degradation in 2.5
- MXS-3184 COM_STMT_EXECUTE with FOUND_ROWS not routed to previous target
- MXS-3028 Node wrongly in Maintenance, Running when the node is actually Down
- MXS-2915 TLS version not used by mxq::MariaDB
Known Issues and Limitations
There are some limitations and known issues within this version of MaxScale. For more information, please refer to the Limitations document.
RPM and Debian packages are provided for the supported Linux distributions.
Packages can be downloaded here.
The source code of MaxScale is tagged at GitHub with a tag, which is identical
with the version of MaxScale. For instance, the tag of version X.Y.Z of MaxScale
maxscale-X.Y.Z. Further, the default branch is always the latest GA version
The source code is available here.