Hi, This is a quite good topic!
1. maybe we should hear more users opinions. For me, I think emphasize the concept of "device" is good. We can even expose the concept in our APIs. 2. > A more efficient way is > root.sg.device1.measurement1_int0 > root.sg.device1.measurement1_int1 > root.sg.device1.measurement1_int2 > root.sg.device1.measurement2_long I think the more efficient way is: root.sg.device1.measurement1.0 root.sg.device1.measurement1.1 root.sg.device1.measurement1.2 root.sg.device1.measurement2 And, as you said "a device has a sensor that collects some data in array format (int[3]) and some in long type", will the user query just one element from the int[3]? If not, a better schema is: root.sg.device1.measurement1 (the dataType is int[]) root.sg.device1.measurement2 (the dataType is long) Best, ----------------------------------- Xiangdong Huang School of Software, Tsinghua University 黄向东 清华大学 软件学院 Jialin Qiao <[email protected]> 于2020年7月20日周一 下午3:28写道： > Hi > > Recently, I find that some users create timeseries do not following the > real world semantic of device > > > E.g., a device has a sensor that collects some data in array format > (int[3]) and some in long type. > > > Many users will create timeseries like this: > > > root.sg.device1.measurement1.int0 > root.sg.device1.measurement1.int1 > root.sg.device1.measurement1.int2 > root.sg.device1.measurement2.long > > > As a consequence, there will be two devices instead of one device. This > will cause the real number of devices is much bigger than the real devices > they thought. The drawback is: more devices leads to more memory > consumption. > > > A more efficient way is > > > root.sg.device1.measurement1_int0 > root.sg.device1.measurement1_int1 > root.sg.device1.measurement1_int2 > root.sg.device1.measurement2_long > > > In this schema, there will be only one device and 4 measurements. > > > The problem is we extract the device id automatically. Users usually do > not have a clear concept about "device". Should we emphasize the concept of > device by letting users create device manually? > > > What do you think? > > Thanks, > -- > Jialin Qiao > School of Software, Tsinghua University > > 乔嘉林 > 清华大学 软件学院
