Alibaba Cloud continuously optimizes the kernel of Tair to provide more features or fix known issues to enhance service stability. You can update the kernel version (minor version) of a Tair instance with a few clicks in the Tair console.
|Instance minor version|
|Proxy minor version||Proxy nodes support hot updates. A proxy node of a new version can restore a connection based on the client connection information of the proxy node of the earlier version. This ensures uninterrupted connections. However, a millisecond-level latency or jitter may occur during the update.|
|Instance minor version|
|Proxy minor version|
Canary release of later minor versions may be available only in specific regions. The system checks the minor version of your instance. If your instance is of the latest minor version, the Minor Version Upgrade or Upgrade Proxy button in the Tair console cannot be found or clicked.
- Log on to the Tair console and go to the Instances page. In the top navigation bar, select the region in which the instance that you want to manage resides. Then, find the instance and click its ID.
- In the Basic information section, move the pointer over the icon to the right of Minor Version Upgrade or Upgrade Proxy to view the minor version of the current instance, the minor version to which you can update, and the release notes of minor versions.
The icon changes colors based on the minor version update level. The update level is displayed in green, yellow, or red to represent the regular, recommended, or critical update.
Update level Color Description LOW Green Regular update. This level includes routine feature updates, such as adding a feature. MEDIUM Yellow Recommended update. This level includes optimization of features and modules. LOW-level updates are also included in MEDIUM-level updates. HIGH Red Critical update. This level includes major updates that ensure stability or security, such as fixing a vulnerability or defect. LOW-level and MEDIUM-level updates are also included in HIGH-level updates.
- After you view the release notes of minor versions, click Minor Version Upgrade or Upgrade Proxy.
- In the panel that appears, select the time when you want to perform the update. Warning The state of an instance changes to read-only within 60 seconds and transient connections within seconds occur when you update the minor version of the instance or a master-replica switchover is executed on the instance. To minimize impacts, we recommend you select Update During Maintenance. This way, the system performs the operation during the maintenance window. For more information about how to modify the maintenance window, see Set a maintenance window.
- Click OK.
Q: Why does an instance change to the Upgrading Minor Version state after I select Update During Maintenance to update the minor version?
A: This is because the instance is preparing for the update. When the system prepares for updates, such as applying for resources and synchronizing data, instances or master and replica nodes are not switched over, and instances that provide services are not affected.
Related API operations
|DescribeEngineVersion||Queries the minor version and minor version release notes of a Tair instance.|
|ModifyInstanceMinorVersion||Updates the minor version of a Tair instance.|