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With the incremental approach this would not happen. Here, a configuration can be viewed as a set of changes. The initial configuration is (+A, +B, +C) then in the scenario above the next configuration is (+A, +B, +C, -B) and last one is (+A, +B, +C, -B, +D). This allows all reconfiguration requests to complete without aborting (a wait-free algorithm), as each change can be applied to the current configuration, whether this configuration remained the same or changed.

The non-incremental approach might be preferable for two main reasons:

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