code: def validate_plan(
      new_plan,
      base_plan=None,
      is_partition_subset=True,
      allow_rf_change=False,
  ):
      
      if not _validate_plan(new_plan):
          _log.error('Invalid proposed-plan.')
          return False
  
      # Validate given plan in reference to base-plan
      if base_plan:
          if not _validate_plan(base_plan):
              _log.error('Invalid assignment from cluster.')
              return False
          if not _validate_plan_base(
              new_plan,
              base_plan,
              is_partition_subset,
              allow_rf_change
          ):
              return False
      # Plan validation successful
      return True
docs: Verify that the new plan is valid for execution.
  
      Given kafka-reassignment plan should affirm with following rules:
      - Plan should have at least one partition for re-assignment
      - Partition-name list should be subset of base-plan partition-list
      - Replication-factor for each partition of same topic is same
      - Replication-factor for each partition remains unchanged
      - No duplicate broker-ids in each replicas