Troubleshooting
For troubleshooting articles. Predominantly problem / error, and workaround / solution.
- Unable to access VDS even with the granted Privileges (v21+)
- Error when uploading to files to home space when fs.s3a.buffer.dir is inaccessible
- StringIndexOutOfBoundsException: Not enough space to pivot single record
- Using wildcards in query paths
- Sources missing post Dremio upgrade
- ERROR: "IllegalStateException: Record count not set for this vector container"
- Dremio UI can report "not found" when a non-admin user accesses a folder or dataset that they have inherited SELECT privileges on
- CTE fails with NullPointerException but Individual Queries from the CTE Run
- Hostname errors in Dremio Cloud
- Engines fail to start executors with "Execution nodes didn't start within the start timeout" in v25.x
- HANDSHAKE_COMMUNICATION error when using JayDeBeApi library to connect to Dremio
- Job failing with the error "List field 'value' exceeded the maximum number of elements 4196, actual number of elements is 4457"
- Algebraic reflection matching can cause excessive heap usage on queries with many joins
- Column limitation - Error: At most 800 columns including leaf level fields of complex type are allowed to be scanned
- Drop tables on object storage sources is not deleting the folder path
- SYSTEM ERROR: GandivaException - Failed to cast the string <string value> to int64_t
- October PowerBuilder release of the Connector for Dremio causing queries to fail with "String value resulted in invalid numeric."
- ERROR: "TypeError: MessageToJson() received an unexpected keyword argument 'including_default_value_fields'" while executing DBT Models to generate views in Dremio.
- ReflectionManager reports "DATA_READ ERROR: Failed to load results for job" for completed REFRESH REFLECTION job
- Query fails with: "Job was canceled because the query is too complex. Please simplify the query."
- Dremio error - Failed to decode column application::varchar - component - version: Dremio 25.0.x
- Dremio UI Session timeout change
- Kerberized source fails on Executors with "KrbException: krb5.conf loading failed."
- java.security.GeneralSecurityException: Directory /opt/dremio/data/security is not accessible to owner only
- Logging changes after upgrading Kubernetes based installs to version 20 and beyond
- Oracle Data Source Shows Invalid “v$session.osuser” Property
- Metadata file errors after upgrading and enabling Apache Iceberg features
- VDS column change can cause unexpected error pop-up for reflections
- Conflicting functions with similar signatures error seen when upgrading
- Null Pointer Exception seen when promoting Delta Lake datasets