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1A client gets a dimension-mismatch error when inserting a point. What are the most common root causes?ExpertHigh 2A filter query that should return results returns an empty list. What would you check first?ExpertHigh 3Why might a collection created without specifying a distance metric or vector size fail immediately, and what does that tell you about how Qdrant treats collection configuration?ExpertHigh 4What causes a 'collection not found' error immediately after a collection was reportedly created successfully in a distributed cluster?ExpertHigh 5Search results seem semantically wrong even though the embedding model is known to work well. What layers would you check to isolate the problem?ExpertHigh 6Recall dropped noticeably after enabling quantization. How would you determine whether the quantization configuration or the rescoring settings are the cause?ExpertHigh 7A previously fast query has become slow after months of continuous upserts and deletes, with no configuration changes. What's the most likely explanation?ExpertHigh 8How would you distinguish a latency problem caused by disk I/O from one caused by CPU-bound distance computation?ExpertHigh 9One node in a three-node Qdrant cluster crashes. What happens to reads and writes for shards that had a replica on that node?ExpertHigh 10After a crashed node recovers and rejoins the cluster, how does it catch up on writes it missed?ExpertHigh 11What symptoms would indicate a 'split-brain' style problem in a distributed Qdrant cluster, and how does the Raft-based consensus layer prevent it?ExpertHigh 12What's your recovery plan if an entire Qdrant cluster is lost (e.g., all nodes' disks fail) and you only have periodic snapshots?ExpertHigh

All Topics

1

Setup and Basic Use

2

Named Vectors and Multitenancy

Sparse Vectors and Hybrid Search

3

Snapshots and Backups

Indexing Internals

Internal Architecture

4

Performance and Optimisation

System Design and Scalability

5

Error Handling and Debugging

Design Patterns

Implementation Scenarios