text: const ONE_MINUTE = 60 * 1000
  const ONE_HOUR = 60 * ONE_MINUTE
  const ONE_DAY = 24 * ONE_HOUR
  const ONE_WEEK = 7 * ONE_DAY
  
  const CRAWL_INTERVAL = ONE_HOUR * 10
  const REMOVE_DEAD_NODE = CRAWL_INTERVAL * 2 + 60 * 1000
  
  module.exports = {
  	throttle: {
  		concurrency: 20,
  		perTimeSpan: 10,
  		timeSpanMs: 1000
  	},
  	MIN_CONTACT_INTERVAL: ONE_MINUTE,
  	CRAWL_INTERVAL,
  	REMOVE_DEAD_NODE,
  	CONTINUOUS_FAILURE_BEFORE_REMOVAL: 10,
  	NODE_CAPACITY: 100,
  	RECHECK_UNREACHABLE_INTERVAL: ONE_WEEK,
  }