Upgrade Multi-Node MariaDB Enterprise ColumnStore from 5.5.2 to 5.6.1

Set Replicas to Maintenance Mode

This action is performed for each replica server on the MaxScale node.

Prior to upgrading, the replica servers must be set to maintenance mode in MaxScale. The replicas can be set to maintenance mode in MaxScale using MaxScale's REST API. If you are using MaxCtrl, the replicas can be set to maintenance mode using the set server command:

$ maxctrl set server \
   mcs2 \
   maintenance

• As the first argument, provide the name for the server

• As the second argument, provide maintenance as the state

Confirm Maintenance Mode is Set for Replicas

This action is performed on the MaxScale node.

Confirm that the replicas are set to maintenance mode in MaxScale using MaxScale's REST API. If you are using MaxCtrl, the state of the replicas can be viewed using the list servers command:

$ maxctrl list servers

┌────────┬───────────────┬──────┬─────────────┬──────────────────────┬────────┐
│ Server │ Address       │ Port │ Connections │ State                │ GTID   │
├────────┼───────────────┼──────┼─────────────┼──────────────────────┼────────┤
│ mcs3   │ 192.0.2.3     │ 3306 │ 0           │ Maintenance, Running │ 0-1-17 │
├────────┼───────────────┼──────┼─────────────┼──────────────────────┼────────┤
│ mcs2   │ 192.0.2.2     │ 3306 │ 0           │ Maintenance, Running │ 0-1-17 │
├────────┼───────────────┼──────┼─────────────┼──────────────────────┼────────┤
│ mcs1   │ 192.0.2.1     │ 3306 │ 0           │ Master, Running      │ 0-1-17 │
└────────┴───────────────┴──────┴─────────────┴──────────────────────┴────────┘

If the node is properly in maintenance mode, then the State column will show Maintenance as one of the states.

Disable GTID Strict Mode

This action is performed on each replica server.

The gtid_strict_mode system variable must be disabled for this upgrade procedure. If the gtid_strict_mode system variable is enabled in any configuration files, disable it temporarily until the upgrade procedure is complete.

You can check if the gtid_strict_mode system variable is set in a configuration file by executing my_print_defaults command with the mysqld option:

$ my_print_defaults --mysqld \
   | grep "gtid[-_]strict[-_]mode"

--gtid_strict_mode=1

If the gtid_strict_mode system variable is set, you can temporarily disable it by adding # in front of it in the configuration file, so that it will be treated as a comment and ignored:

[mariadb]
...
# temporarily commented out for upgrade
# gtid_strict_mode=1

Shutdown ColumnStore

This action is performed on the primary server.

Prior to upgrading, MariaDB Enterprise ColumnStore must be shutdown. MariaDB Enterprise ColumnStore can be shutdown using CMAPI with the shutdown endpoint.

If you are calling CMAPI on the primary server from a local shell, the mcsShutdown alias can be used to call the shutdown endpoint:

$ mcsShutdown

If you are calling CMAPI on the primary server from a remote node, you can call the shutdown endpoint using curl or another REST client:

$ curl -k -s -X PUT https://mcs1:8640/cmapi/0.4.0/cluster/shutdown \
   --header 'Content-Type:application/json' \
   --header 'x-api-key:CMAPI_API_KEY' \
   --data '{"timeout":60}' \
   | jq

• Replace CMAPI_API_KEY with your CMAPI API key

Stop Services

This action is performed on each ColumnStore node.

Prior to upgrading, several services must be stopped on each ColumnStore node:

1. Stop the CMAPI service:

   $ sudo systemctl stop mariadb-columnstore-cmapi
   

2. Stop the MariaDB Enterprise ColumnStore service:

   $ sudo systemctl stop mariadb-columnstore
   

3. Stop the MariaDB Enterprise Server service:

   $ sudo systemctl stop mariadb
   

Update Packages

This action is performed on each ColumnStore node.

MariaDB Enterprise ColumnStore and its dependencies must be upgraded.

To upgrade on CentOS and RHEL:

$ sudo yum update "MariaDB-*" "mariadb-*"

To upgrade on Debian and Ubuntu:

$ sudo apt update
$ sudo apt install --only-upgrade "mariadb-*"

Disable ColumnStore Service

This action is performed on each ColumnStore node.

After upgrading, the MariaDB Enterprise ColumnStore service should be stopped and disabled, since it will be controlled by CMAPI:

$ sudo systemctl stop mariadb-columnstore
$ sudo systemctl disable mariadb-columnstore

Start Services

This action is performed on each ColumnStore node.

After upgrading, the CMAPI service and the MariaDB Enterprise Server service must be started on each ColumnStore node:

1. Start the CMAPI service:

   $ sudo systemctl start mariadb-columnstore-cmapi
   

2. Start the MariaDB Enterprise Server service:

   $ sudo systemctl start mariadb
   

Start ColumnStore

This action is performed on the primary server.

After upgrading, MariaDB Enterprise ColumnStore must be started. MariaDB Enterprise ColumnStore can be started using CMAPI with the start endpoint.

If you are calling CMAPI on the primary server from a local shell, the mcsStart alias can be used to call the start endpoint:

$ mcsStart

If you are calling CMAPI on the primary server from a remote node, you can call the start endpoint using curl or another REST client:

$ curl -k -s -X PUT https://mcs1:8640/cmapi/0.4.0/cluster/start \
   --header 'Content-Type:application/json' \
   --header 'x-api-key:CMAPI_API_KEY' \
   --data '{"timeout":60}' \
   | jq .

• Replace CMAPI_API_KEY with your CMAPI API key

Enable GTID Strict Mode

This action is performed on each replica server.

If you temporarily disabled the gtid_strict_mode system variable in the Disable GTID Strict Mode step, it can be re-enabled. If the gtid_strict_mode system variable was temporarily disabled in any configuration files, re-enable it.

Confirm ColumnStore Version

This action is performed on each ColumnStore node.

After upgrading, it is recommended to confirm the Enterprise ColumnStore version on each ColumnStore node. Connect to the node using MariaDB Client and query the Columnstore_version status variable with SHOW GLOBAL STATUS:

SHOW GLOBAL STATUS
   LIKE 'Columnstore_version';

+---------------------+-------+
| Variable_name       | Value |
+---------------------+-------+
| Columnstore_version | 5.6.1 |
+---------------------+-------+

Confirm ES Version

This action is performed on each ColumnStore node.

After upgrading, it is recommended to confirm the ES version on each ColumnStore node. Connect to the node using MariaDB Client and query the version system variable with SHOW GLOBAL VARIABLES:

SHOW GLOBAL VARIABLES
   LIKE 'version';

+---------------+----------------------------------+
| Variable_name | Value                            |
+---------------+----------------------------------+
| version       | 10.5.10-7-MariaDB-enterprise-log |
+---------------+----------------------------------+

Clear Maintenance Mode for Replicas

This action is performed for each replica server on the MaxScale node.

After the upgrade, maintenance mode for each replica has been cleared in MaxScale using MaxScale's REST API. If you are using MaxCtrl, maintenance mode can be cleared using the clear server command:

$ maxctrl clear server \
   mcs2 \
   maintenance

• As the first argument, provide the name for the server

• As the second argument, provide maintenance as the state

Confirm Maintenance Mode is Cleared for Replicas

This action is performed for each replica server on the MaxScale node.

Confirm that maintenance mode in MaxScale has been cleared for each replica using MaxScale's REST API. If you are using MaxCtrl, the state of the replicas can be viewed using the list servers command:

$ maxctrl list servers

┌────────┬───────────────┬──────┬─────────────┬─────────────────┬─────────┐
│ Server │ Address       │ Port │ Connections │ State           │ GTID    │
├────────┼───────────────┼──────┼─────────────┼─────────────────┼─────────┤
│ mcs3   │ 192.0.2.3     │ 3306 │ 0           │ Slave, Running  │ 0-3-159 │
├────────┼───────────────┼──────┼─────────────┼─────────────────┼─────────┤
│ mcs2   │ 192.0.2.2     │ 3306 │ 0           │ Slave, Running  │ 0-1-88  │
├────────┼───────────────┼──────┼─────────────┼─────────────────┼─────────┤
│ mcs1   │ 192.0.2.1     │ 3306 │ 0           │ Master, Running │ 0-1-88  │
└────────┴───────────────┴──────┴─────────────┴─────────────────┴─────────┘

If the node is no longer in maintenance mode, then the State column will no longer show Maintenance as one of the states.