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  1. Whenever a split is added or removed from the SourceOperator, the "Assigner" needs to build a new mapping of the new split to unused KeyGroup or delete the corresponding mapping for the removed split.
  2. Giving a Key, firstly computing the splitID it belongs to with the function provided by the user. Then returning the KeyGroup the splitID mappedmaps to.

After all, the functions users need to provide are,

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