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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 query schema and all time series in Apache IoTDB?

How do I query the schema of Apache IoTDB? Does Java currently have such an API open? Also, does Java have an API to check all the time series stored in IoTDB. Also, I want to check the schema and all time series both in the console of IoTDB and in…
Thoreau I
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How to check the data in Apache IoTDB when transferring the results into JSONObject?

I used the JDBC method to query data in Apache IoTDB, the sql statement is successfully executed, but when I tried to transfer the result into JSONObject, the response does not have the three fields: max, min, and count. Is this a bug or how can I…
Hester Tso
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How to query the aligned and unaligned time series separately in Apache IoTDB?

I realized that in Apache IoTDB, time series can set to be aligned or unaligned, and two types of time series can simultaneously be stored. I wonder if I set these two types of time series at the same time, and I want to check the aligned and…
zlyf
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After updating to Version 1.0.1, how can I successfully use "fill(previous)" to fill blank values in Apache IoTDB?

Does anyone know that why the fill(previous) statement is not working for Version 1.0.1 of Apache IoTDB? I updated from Version 0.12, and when I tried the same statement, there is no effect and no blank value are filled. I need to filled this time…
shuww
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How to set the number of ports for ConfigNode and DataNode in cluster of Apache IoTDB Version 1.0.1?

When I tried to upgrade Apache IoTDB to Version 1.0.1, seems like for dn_target_config_node_list only one IP port can be filled, so I cannot set dn_target_config_node_list = 172.27.22.157:10710,172.27.22.158:10710 in V1.0.1? If only one port can be…
zai
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How to import data and automatically create time series from csv files to Apache IoTDB?

Is there a tool for importing time series into Apache IoTDB? I checked and know that IoTDB has "import-csv" function, but looks like it can only import data into IoTDB. What I expect is that I can write all data in csv, and can directly import data…
NKZ
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Get the data from eclipse ditto to apache IoTDB/ InfluxDB

I'm currently working on a project that involves integrating Eclipse Ditto with Apache IoTDB or InfluxDB (or any other suitable DB if not possible in these two). I need to transfer data from Eclipse Ditto to DB to leverage its time-series data…
Utkarsh Kumar
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After upgraded from V0.13.4 to V1.0.1, why Apache IoTDB cannot query data while can successfully run?

I refer to the steps on the official website to upgrade the version of Apache IoTDB from V0.13.4 to V1.0.1, and change all the data directories in the settings of V1.0.1 configuration files to the data directory of V0.13.4. After this upgrade…
Sihan Liu
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Why Apache IoTDB Version 1.0.1 cannot use ip number to connect server?

Apache IoTDB Version 1.0.1 can only be accessed by host 127.0.0.1, but cannot be accessed by ip number. What may be the reason for this problem? I checked and made sure that firewall was turned off, and I also tried but could not connect IoTDB with…
Hester Tso
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How to deal with "statistics classes mismatched" error when imported tsfile to different server in Apache IoTDB?

ERROR o.a.i.d.e.c.l.LevelCompactionTsFileManagement:696 - Error occurred in Compaction Merge thread org.apache.iotdb.tsfile.exception.filter.StatisticsClassException: Statistics classes mismatched:…
zlyf
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How to query average value of data and round it to be two decimal points in Apache IoTDB?

I am learning the UDF calculation functions supported in Apache IoTDB, and I realized that when querying average values using "avg", seems like the whole average value will be queried out. I wonder can the average value be queried out, and to keep,…
zai
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Why did Apache IoTDB filled data in aligned time series but reported "timeseries not aligned" error?

What is the reason for judging whether the time series is aligned when the data is written to Apache IoTDB? My empty data is filled with null as aligned data, and a timeseries under this device are not aligned error is reported when I used…
Hester Tso
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How to transfer batches of data from one database to the other database of Apache IoTDB?

I am now thinking if I can set up a temporary Apache IoTDB database to transfer large amount of data. May I ask how to import data from one IoTDB server to another IoTDB server in batches (such as the data of a database)? I currently use Version 1.2…
Thoreau I
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How to deal with "getFloat() is not supported for current sub-class" error in Apache IoTDB?

Does anyone know how to deal with "getFloat() is not supported for current sub-class" error in Apache IoTDB? I created a test IoTDB in Version 1.1.1, and then copied the data folder of the official IoTDB V1.1.1 to the server where the test IoTDB is…
shuww
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Other than SessionPool interface, how to create aligned time series in Apache IoTDB?

I am still learning how to use Apache IoTDB, and I am corresponding the official guide with the actual practice. Seems like there is no interface for creating aligned time series in "SessionPool". I wonder do the aligned time series only can be…
Monster Zhang
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