01.11.2024 Problem:
The client faced an issue with Apache Cassandra where an error occurred while building indexes. The error message was: Unexpected error while building indexes: Could not find type for id: 12297. The client had also partially configured dual data centers, which added complexity to the problem.
Process:
Initial Identification:
The expert determined that the issue was related to JanusGraph and not a direct problem with Cassandra. The expert consulted relevant resources, including JanusGraph GitHub issues and Stack Overflow discussions, to understand similar problems and potential solutions.
Configuration Review:
The expert reviewed the client’s Cassandra configuration parameters and noted the lack of dual data center settings, which were pending in a new version of the client’s application.
Recommendations Provided:
- Complete Dual Data Center Setup: Advised the client to follow the official documentation to complete the dual data center configuration and ensure the client driver was correctly set up.
- Involve a Java Expert: Suggested engaging a Java expert.
Additional Information Request:
- The query being used.
- Whether an index was created on the field being queried.
- If using the same field and query for different data retrieval worked as expected.
- The Gremlin query being executed.
- All field names and their types for the specific value, including a schema of the entity and query.
- Planned testing of the query with different parameters to determine if the issue was specific to a particular record or if it was more widespread.
Solution:
Completion of Dual Data Center Setup:
The client followed the official documentation to complete the dual data center setup. The configuration was finalized, and the client driver was correctly set up for dual data center functionality, which resolved issues related to incomplete setup.
Java Expert Involvement:
The client engaged a Java expert. Expert guidance helped address specific issues with JanusGraph integration and configuration, facilitating the resolution of the indexing problem.
Provision of Additional Information:
The client provided the requested details, including query information, index usage, and schema. With the complete set of information, the expert team conducted a detailed analysis and identified that the issue was indeed related to index configuration.
Conclusion:
By implementing the recommendations provided, the client successfully resolved the indexing error in Apache Cassandra. Completing the dual data center setup, engaging a Java expert, and providing detailed information allowed for a thorough investigation and resolution of the issue.