Redis rebalance - slot migration process
1. source node
cluster setslot {slot} importing {sourceNodeId}
2. target node
cluster setslot {slot} migrating {targetNodeId}
3. source node
cluster getkeysinslot {slot} {count}
4. source node
migrate {targetIp} {targetPort} "" 0 {timeout} keys {keys...}
5. repeat 3 and 4
repeat 3 and 4 until get nothing from getkeysinslot
6. all master nodes
cluster setslot {slot} node {targetNodeId}
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