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  Specifies reservations via (1) number of the executors to be reserved,
  (2) the cron syntax to specify the start time of reservations, and
  (3) duration of the reservation

  
    Specifically, each line consists of 7 fields separated by TAB or whitespace:
  
  SIZE : MINUTE HOUR DOM MONTH DOW : DURATION
  
    
      SIZE
      Number of executors to be reserved.
    
    
      MINUTE HOUR DOM MONTH DOW
      
          See this for the details of the cron syntax
          This specifies the starting point of the reservation.
      
    
    
      DURATION
      The length of the reservation in terms of minutes.
    
  
  
    Size can be negative, which is useful for cancelling out other reservations. For example,
    you might have "2 : 0 8 * * * : 480" to indicate 8hr reservation from 8am for 2 executors,
    then you can have "-1 : 0 12 * * * : 60" to indicate that from noon to 1pm, the reservation goes down to 1 executor from 2.
  
  
    
      Examples
      
# during weekday 8am-5pm, free up 2 executors for interactive use
# 5pm-8am = 9hr = 540mins
2 : 0 8 * * 1-5 : 540

SIZE	Number of executors to be reserved.
MINUTE HOUR DOM MONTH DOW	See this for the details of the cron syntax This specifies the starting point of the reservation.
DURATION	The length of the reservation in terms of minutes.