public boolean isLocked() {
    return coordinatorLock.isLocked();
  }
Lock the {@link SubscriptionInfo} coordinator.

@return the {@link SubscriptionInfo} holder, which can be used to get the {@link
    SubscriptionInfo}. Wait until lock is acquired
iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/manager/subscription/SubscriptionCoordinator.java