About Rebalance Mode (SYNC & NONE)

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Hi Community,

For partition mode cache(without persistence enabled),If rebalanceMode 
is configured as NONE, rebalancing will actually occur when a new node 
is added,This does not match the function definition,i think this is a bug.

But,for persistent cache, rebalancing is controlled by the baseline 
topology,For disabling persistent cache, it seems that rebalanceMode 
config to (SYNC & NONE) has no practical significance, so what is the 
value of this parameter design? Is this a legacy of history that is 
about to be abandoned?