private void validateTrackerType() {
    String trackerType = routerConfig.routerGetOperationTrackerType;
    if (!trackerType.equals(SimpleOperationTracker.class.getSimpleName()) && !trackerType.equals(
        AdaptiveOperationTracker.class.getSimpleName())) {
      throw new IllegalArgumentException("Unrecognized tracker type: " + trackerType);
    }
  }
Validates the tracker type in config.
ambry-router/src/main/java/com/github/ambry/router/GetOperation.java