Troubleshooting
For troubleshooting articles. Predominantly problem / error, and workaround / solution.
- Dremio failure with error "org.rocksdb.RocksDBException: While open a file for random read"
- Dremio generates the .tds file for Tableau with the wrong port
- Testing Arrow Flight ODBC with SSL Connection to Dremio using Python
- Error message 'securityProfile.encryptionAtHost' observed when scaling an engine or executing a query
- Slow query planning on scale-out coordinators vs master-coordinator.
- Query fails with OutOfMemoryException "Buffer count exceeds maximum"
- New install of Dremio startup fails on a kubernetes deployment with "Could not create the Java Virtual Machine."
- PowerBi Navigator only shows 10,000 spaces and subfolders from Dremio
- Dremio Cloud - Engine scaling fails due to instance capacity issues
- 502 error when adding a source
- Conversion to relational algebra failed to preserve datatypes
- Dremio process exits with java.lang.OutOfMemoryError: unable to create new native thread
- Iceberg table shows NULL values for all columns
- Slow startup after upgrade to Dremio v25
- KB: Enforcing IMDSv2 Interrupts Dremio Service
- UnknownFormatConversionException seen when creating reflections
- Coordinator spawning multiple threads and becoming unresponsive
- DDC collection fails with "failed: 'exit status 1') Error: unknown flag: --retries"
- PowerBi Navigator only shows 10,000 spaces and subfolders
- Troubleshooting: Query error: release version 8 not supported
- Changes to AzureAD permissions in 24.3
- Java 11 GC logging options
- Ranger - failed to refresh policies. Will continue to use last known version of policies (-1)
- Verify Ranger Policies on Dremio Coordinator
- Unable to format any PDS on a specific Source: "Unexpected Error occured"
- Failure while attempting to run instances. There are not enough free addresses in subnet <subnet-id> to satisfy the requested number of instances.
- AWSE Engine Launch failed: not have sufficient <instance type> capacity in the Availability Zone you requested
- Create database, schema, table then grant permission to Snowflake user role for client (Dremio) to access. - Snowflake - All version
- Why does my Rest API SQL query return only 100 rows?
- Troubleshooting "Query was rejected based on a rule that did not specify a rejection reason."