 
       # Calculate blocked and pending tasks:
       # 
-      #   1. Set `blocked.groups` of result.
-      #   2. Initiate another transaction to count all `BLOCKED` tasks. Blocked
+      #   1. Initiate another transaction to count all `BLOCKED` tasks. Blocked
       #   tasks are tasks in the `QUEUED` lists whose group identifiers are in
       #   the `BLOCKED` set. **Note:** The leftmost task of each `QUEUED` list
       #   will not be counted, since that's the causing (failed) task.
-      #   3. Calculate pending tasks.
+      #   2. Calculate pending tasks.
       #
       # The equation used to calculate pending tasks is:
       #
       #      pending = total - finished - processing - failed - blocked
-      result.blocked.groups = multi_res[4].length
       multi2 = @redis.multi()
       multi2.llen "#{@key('QUEUED')}:#{group}" for group in multi_res[4]
       multi2.exec (multi2_err, multi2_res) ->

  #         pending_tasks: 0 }
  #
  # If there're no finished tasks, `average_pending_time` and
  # `average_processing_time` will both be string `-`.
  #
  # **Usage:**
  #


      # Process the result of the transaction.
      #
      # + Assign multi results to result object, and:
      # + Convert:
      #   - `total_pending_time` into `average_pending_time`, and:
      #   - `total_process_time` into `average_process_time`
      # + Calibrate initial condition (in case of no task is finished).
      statistics = multi_res[1] or {}
      result =
        name: @name
