Node Operation

UHadoop provides various node operations, which can be chosen according to different scenarios.

Adding Nodes

Adding of Core and Task nodes are supported, you can click the “Add Node” button to enter the addition page:

On the add node page, you can configure node type, disk type, node specifications, disk information, number of nodes, and other information to complete the addition of nodes. After node creation is completed, you can use the new node.

Note: The addition of new Core nodes requires data balancing operations, see Data Balancing for specifics.

Node Upgrade

Master Node Upgrade

Master node upgrade will operate on all Master nodes in the cluster. You can click “Upgrade Master Node” to enter the upgrade page:

Master upgrade supports upgrade specifications and modify disk size two operations, explanation are as follows:

• Upgrade specifications: change all Master node CPU/memory configurations, the server will be restarted during the upgrade period, it is recommended to operate during off-peak hours of the business, downgrade is not supported yet.

• Modify disk size: modify the disk size of all Master nodes, no need to restart the node during the upgrade, only new machines support this operation, see front-end operation restrictions for specifics.

Core/Task Node Upgrade

Core and Task nodes support single node dimension upgrade, you can select the corresponding node and click “Edit Node” to enter the upgrade page:

Core/Task upgrade supports upgrade specifications and modify disk size two operations, explanation are as follows:

• Upgrade specifications: change operation node CPU/memory configuration, the server will be restarted during the upgrade period, it is recommended to operate during off-peak hours of the business, downgrade is not supported yet.

• Modify disk size: modify the disk size of operation node, no need to restart the node during the upgrade, only new machines support this operation, see front-end operation restrictions for specifics.

Note: Core node expansion requires data balancing operations, see Data Balancing for specifics.

Component Management

Selecting a specific node and clicking “Component Management” can view the component information deployed on the node:

Each component can be stopped, started, and restarted:

EIP Binding

You can perform EIP binding/unbinding operations on nodes to enable or disable node external network access permissions, only Master node supports this operation.

Firewall Binding

You can perform firewall binding on nodes to set node access strategy, only Master node supports this operation.

Node Deletion

Only Core nodes and Task nodes deletion are supported, Master node is not.

Deletion of Core Nodes

The minimum number of Core nodes is 3, deletion operation is only supported when the number of Core nodes is more than 3, among which Core1 node is a special node and deletion is not allowed.

• Node off-line: Core node deletion requires first offlining the node, syncing the data on the node to other nodes, you can select a specific node, click the “Offline” button:

• Node deletion: After the off-line operation, the node will be in the “off-line” state, when the node becomes “unavailable” it means that data synchronization has been completed, you can click the corresponding “Delete” button to delete the node.

Deletion of Task Nodes

If remaining computing resources are sufficient, you can select a corresponding task node and click the corresponding “Delete” button to delete this node.