@TestOnly
  public ConsumerGroupMeta getExistingConsumerGroupMeta() {
    return this.existingConsumerGroupMeta;
  }
This is only used when the subscription info lock is held by another procedure.
iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/procedure/impl/subscription/consumer/AlterConsumerGroupProcedure.java