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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 unify the time reported by server and docker of Apache IoTDB?

I realized that the time of Apache IoTDB server is not correct, right know it reported: 2023-02-07 08:29:56, 997. However, I checked the time of the docker, and the docker time is correct, which reported: 2023-02-07 04:52:04 PM CST. Anyone know what…
Hester Tso
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Why Apache IoTDB deleted all time series when using "drop" command in Version 1.0.1?

I have encountered a problem in Apache IoTDB V1.0.1-standalone: when there are 3 time series in IoTDB, and I use "drop timeseries root.In.k2", then all 3 time series are gone while I only need to delete one time series. Wonder if this is a bug or I…
shuww
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How should I recover service of Apache IoTDB when reporting "Fetch Schema failed" error after restarting?

After Apache IoTDB's service is restarted, an error will be reported both in inserting data and querying data. The error message is: "java. lang.RuntimeExpception: Fetch Schema failed." Now I use IoTDB Version 1.0.0, wonder how to deal with this…
NKZ
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How should Apache IoTDB save json type of data?

I was checking the datatype that can be stored in Apache IoTDB, and have a question for this. How to save json type data in IoTDB, which means the event-type data? Seems like IoTDB does not directly support storing this type, so what type do I need…
Anita
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Why Apache IoTDB reported "cannot be cast to class" error and how to solve it?

I used "createAlignedTimeseries" in Apache IoTDB, and this error was reported: org.apache.iotdb.rpc.StatementExecutionException: 305: class org.apache.ratis.protocol.Message$1 cannot be cast to class org.apache.iotdb.consensus.ratis.ResponseMessage…
Mandy Lin
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How to know the number of time series counts in Apache IoTDB?

I am still new to IoTDB and am currently inserting my data into it from the old database. However I am not sure how many time series are there now. Want to know how to query the total number of time series amount under the database of Apache IoTDB?
Thoreau I
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What is the efficiency difference between using last and last_value query in Apache IoTDB?

I am currently learning query functions in Apache IoTDB, and I found that for querying the latest value of certain time series, seems like last and last_value can both query the last data. Is there any difference in query efficiency between last and…
Hester Tso
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How to write sql query statement to find the maximum value of certain column in time series of Apache IoTDB?

When monitoring power consumption, I often need to find the peak load. I would like to know how to write sql to find the maximum value of a certain column in Apache IoTDB. I tried SELECT MAX_VALUE(s02), s03, s01 FROM root.s1899.s119.s001 , but it…
NKZ
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Why needed to increase dn_max_connection_for_internal_service when adding confignode in Apache IoTDB?

Has anyone seen this error report in Apache IoTDB? When adding ConfigNode in IoTDB, seed_confignode field showed this error. you need to increase dn_max_connection_for_internal_service. I don't know why I need to increase this parameter and how…
Jackie Du
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When other servers are normal, why one server kept reporting "data is not ready" in Apache IoTDB?

I would like to ask you guys a question about Apache IoTDB. An error was reported when using "select", saying that the data is not ready. I think it may be because that the server has just started, but other databases already can query data. Also I…
shuww
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How to query metadata information other than using show syntax of Apache IoTDB?

Is there a way to query the metadata information of Apache IoTDB other than using the "show" syntax? I know that for mqsql's query table information, it can use statement like "select * from information.column" to check metadata. Wonder if IoTDB has…
zx shen
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Why the same statement with long device name cannot query data when can successfully insert data in Apache IoTDB?

Why the same statement with long device name cannot query data when can successfully insert data in Apache IoTDB? I am now using stand-alone Version 0.13.3 of Apache IoTDB, and tried to query data of special device name: "select last js_data from…
Weicheng Pan
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Why original query reported 301 error after data migration to Apache IoTDB Version 1.0.0?

I just migrated my data from Apache IoTDB Version 0.13.2 to Version 1.0.0. When I tried to execute the original sql query, it failed and reported this 301 error: Declared positions (811) does not match column 0's number of entries (735). I am doing…
Hester Tso
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How to get remote access of datanodes in Apache IoTDB when local access is fine

Has anyone encountered the problem that there is no problem with local access, but cannot successfully execute remote access of data nodes in Apache IoTDB? I checked the server's firewalls are all turned off, and the network to this data node is…
NKZ
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How to change the parameters of configuration files for different confignodes and datanodes of Apache IoTDB?

Should the iotdb-common.properties configuration files of the configNode and dataNode nodes in the cluster of Apache IoTDB be consistent for every node? When it is necessary to adjust general parameters of the nodes, which node's configuration files…
Thoreau I
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