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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 do I connect to Apache IoTDB Standalone Version 1.0 from a different computer?

I deployed IoTDB on a server and start it in standalone mode, then connect my laptop to IoTDB on the server, but I cannot connect to IoTDB. The error reported that the server port is not open. Does anyone know how to successfully connect to the…
Roland Xi
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How to avoid the Runtime Exception error when multiple device ids are inserted at the same time in Apache IoTDB?

During the process of batch storage into Apache IoTDB, the following error is occasionally reported, and there is no abnormality in the data inserted. I have verified the data, and found that if two device ids are put together and submitted, this…
Cecilia Wong
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How to set the query timeout period of Apache IoTDB?

I seems to encounter query timeout problem when this error appears in Apache IoTDB Version 0.13.0: org.apache.iotdb.db.exception.query.QueryTimeoutRuntimeException: Current query is time out, please check your statement or modify timeout…
Hsin-Yuan Huang
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Why did Apache IoTDB report 301 type error when exporting tsfile?

When I use "export-tsfile.sh" in Apache IoTDB, an error popped out when exporting tsfile. I tried to execute 230 SQL statements in total. When executing the second line, the error reported: "Cannot dump result because: 301: DriverTask…
NKZ
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How to switch an unempty time series data type from FLOAT to DOUBLE in Apache IoTDB?

If a time series was created before in Apache IoTDB, and the data type was FLOAT. Also, part of the data has already been inserted in the time series. Now I want to change the data type of time series to DOUBLE. I wonder if IoTDB can change the data…
guhdgrtyh
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How can I manually merge out-of-order data into a sequential format in Apache IoTDB?

Are there any way to trigger the merging of out-of-order data into sequential data besides restarting Apache IoTDB? I think flush can only flush data and write it to disk, but it cannot let out-of-order data be written into sequential data. I know…
Hao Yue
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What's the underlying storage engine in Apache IoTDB?

Does the underlying storage engine in Apache IoTDB use other mature storage engine, like RocksDB, LevelDB or Cassandra? Or it implements its own storage engine from sratch?
Yuan Tian
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How to deal with the stucked query tasks when one statement is executed by mistake in Apache IoTDB?

I would like to ask, if a relatively large query SQL is executed by mistake in Apache IoTDB, and no data result is returned yet. This query task caused all other select statement to be blocked and stucked. How can I deal with this in IoTDB? (for…
Monster Zhang
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How to balance the data tasks in Apache IoTDB Version 1.0 when a new datanode is created?

When I adds a new datanode in Apache IoTDB Version 1.0, will the previous data tasks be automaticaaly balanced to this datanode? If IoTDB does not balance the tasks automatically, can I manually order it to be balance to this node, and how to do…
Thoreau I
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What may be the appropriate encoding method when I want to save the sensor data with two decimals in Apache IoTDB?

I currently saved the sensor data in Apache IoTDB with two decimal places, so is it suitable to use the encoding method run-length encoding (RLE) to compress the data? Also, if neither the encoding method (ENCODING field) nor the compression method…
NKZ
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How to mount and activate the template created in Apache IoTDB?

How many templates can be created in Apache IoTDB? Without the same physical quantity, are there no relationship between the template mounted on the lower layer node and the upper layer node? How can I mounted and activate the templates in IoTDB?
zlyf
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How to get access of the client side mqtt service in Apache IoTDB?

I checked the built-in mqtt service of Apache IoTDB, and seems like it only contains service on the server side. I want to know why there is no client side service of mqtt and how should I get access of this service in IoTDB?
Hester Tso
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How to set up template and update node if all fields are in one time series of Apache IoTDB?

We now have multiple sensors for each device, and their data are uploaded together, such as temperature, humidity, pressure, etc. These data are uploaded every minute, and they are all in one piece of data. I wonder if we use Apache IoTDB to write…
shuww
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How to set multiple data directories when storing data in 3 copies of cluster version of Apache IoTDB?

May I ask if I use 3 copies to store data in the cluster version of Apache IoTDB, is it still possible for me to configure multiple data directories? If I can still set multiple data directories, then how should I set them in cluster version of…
Monster Zhang
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After restarting Apache IoTDB, why the system still prompted 6667 configuration port is occupied?

I have just restarted my computer to try to startup Apache IoTDB, and seems like the error information still prompted that the 6667 port, that I configured the Cli tool of Apache IoTDB, is already occupied. I thought the cli should be run alone, so…
Thoreau I
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