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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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