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Questions tagged [apache-iotdb]

Questions related to the Apache IoTDB Project (https://iotdb.apache.org/). Apache IoTDB (Database for Internet of Things) is an IoT native database with high performance for data management and analysis, deployable on the edge and the cloud.

The Project itself states (see https://iotdb.apache.org/)

Apache IoTDB (Database for Internet of Things) is an IoT native database with high performance for data management and analysis, deployable on the edge and the cloud. Due to its light-weight architecture, high performance and rich feature set together with its deep integration with Apache Hadoop, Spark and Flink, Apache IoTDB can meet the requirements of massive data storage, high-speed data ingestion and complex data analysis in the IoT industrial fields.

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How to troubleshoot aggregation data results returning null values for indefinite time periods in Apache IoTDB Version 0.13.3?

I currently use Apache IoTDB Version 0.13.3. When I tried to query the first and last value of data using group by, the aggregated data result returned is null, but I know that the data should not be null. I checked the same device, the aggregation…
Phil Li
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How can I successfully connect to an Apache IoTDB cluster version using code commands?

After I installed the cluster version (1C1D) of Apache IoTDB, I can't connect through coding in the server. I have checked the port and the parameter settings and they all seem to be normal. However, when I use start-cli.sh in the sbin folder on…
yana shen
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How do I calculate the mean value of time series data for two measuring points in Apache IoTDB Version 0.12?

I currently use Apache IoTDB Version 0.12 and I have a question that needs advice. How to find the mean data value of two measuring points according to certain time series? I checked the official user guide of V0.12 and did not find any related…
Ian Wen
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How to change timestamp precision from ms to us or ns when timestamp_precision settings reported error in Apache IoTDB?

I read the user guide and startup process of Apache IoTDB, and they both stated that timestamp_precision parameter can be used to set timestamp precision as "ms", "us" or "ns". However, when I tried to switch the timestamp precision from "ms" to…
ごまめとにまめ
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How can I query out six-digit decimals full data in Apache IoTDB?

When I query data using Apache IoTDB, it seems like by only two-digit decimals of data are queried out by default. The original data is in six-digit decimals. Anyone know how can I reset the default settings and query and retrieve the stored full…
aleina.48
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How should Apache IoTDB both merge and page data values of different time periods in multiple devices?

I am still a newbie to Apache IoTDB and I have a question when reading the official user guide --- Can Apache IoTDB generate merging and paging the data result of different time periods from multiple physical quantities of multiple devices? In the…
Johnston Guan
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How should Apache IoTDB be started after changing the IP number setting of data node properties?

I have a question to ask about Apache IoTDB: I changed the 127.0.0.1 in iotdb-datanode.properties to my actual ip. However, when I tried to start IoTDB, an error occured. I checked the log of IoTDB, and the log prompts that "cannot register datanode…
Miao Ge
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apache iotdb 1.0 install in Windows

How to set the maximum file number to 65535 in a Windows system before installing IoTDB 1.0? Is it necessary to meet this requirement? If ture,can't find a way to install in winodws
Thoreau I
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How to query data values align by device with certain number of equipment result be removed using Apache IoTDB?

According to the query result align by device, can the query results of some devices be removed according to certain condition in Apache IoTDB? For example, I only want to query the data of fans 1-20 from hundreds of fans in total, and I cannot…
Haolong Mu
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How to query latest value of large amount of devices that are all aligned in Apache IoTDB?

IoTDB> select last * from root.station01.cell.bms01.bunch01.** limit 10 align by device; Msg: 701: Last query doesn't support align by device. I tried this statement in Apache IoTDB: select last * from root.station01.cell.bms01.bunch01.** limit…
Alex Zhou
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How can Apache IoTDB query measurement point value without spelling out all layers of equipment name?

If Apache IoTDB wants to query the data value of one measuring point, the name of each layer of equipment must be spelled in the query statement (for example root.vehicle.electric.speed.sensor1). I wonder if there is a way to simplify this query…
Fanshu Ma
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How should Apache IoTDB query latest values when inserting multiple fields?

I currently use Version 1.0 of Apache IoTDB. After inserting 40 fields in IoTDB, why can only 3 fields be queried each time? I want to check the latest value of these fields, but all fields can only be queried without adding "last". Should I use a…
Ava Kim
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When are "deleted" tsfiles droppen in IoTDB?

when I delete a timeseries in IoTDB (0.13.0) with DELETE TIMESERIES xxx I cant query it anymore but I realized that the tsfiles are still stored and also a call to MERGE or FLUSH didnt clean them up. So my question is, when are these tsfiles cleaned…
Julian
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Why not using a HashMap to get the exact enum instead of compare it one by one?

When I was reading the source code of IoTDB, I found that maybe we can add a HashMap in lots of enum class like TSEncoding to imrpove the time complexity of looking up from O(n) to O(1), like: private static final Map map = new…
Yuan Tian
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How to handle "Current system mode is read-only" when using IoTDB?

When I inserted data to Apache IoTDB, the server log show that "Current system mode is read-only". And I found no data was inserted successfully, how to handle this?
Xiangwei Wei
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