Node Migration

CnosDB can MOVE data from one node to another by using SQL 'MOVE VNODE'.

Syntax

Move Vnode

MOVE VNODE [vnode_id] TO NODE [node_id]

Copy Vnode

COPY VNODE [vnode_id] TO NODE [node_id]

Drop Vnode

DROP VNODE <vnode_id>

Compact Vnode

COMPACT VNODE <vnode_id>[ <vnode_id>[ ...]]

Check Group Consistency
To be released

CHECKSUM GROUP <replication_set_id>

Example

• Move Vnode

MOVE VNODE 6 TO NODE 1001; /*the specific vnode id and node id vary according to the actual environment*/

• Copy Vnode

COPY VNODE 7 TO NODE 2001;

• Drop Vnode

DROP VNODE 13;

• Compact Vnode

COMPACT VNODE  7 10 11 12;