@Override
  public void start(String opName) {
    activeOperations.put(opName, new ActiveOperation());
    maxThroughputPerOperation = getMaxThroughput() / activeOperations.size();
  }
Stores the information of one controlled compaction.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/throttle/PressureAwareThroughputController.java