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datafusion-max-parquet-fanout
| Default | 1000 |
| Allowed Values | Integer: 1 – 1,000,000 |
| Category | Query Execution |
Detailed Explanation:
Controls the maximum number of Parquet files that can be read in parallel during a single query operation. A high fanout value does not mean all files are read simultaneously — the thread pool still controls actual parallelism. The fanout value controls how the query plan is structured.
Recommendations by Instance Size:
| Instance Type | vCPUs | Memory (GiB) | Recommended Value |
|---|---|---|---|
| db.influx.medium | 1 | 8 | 250–500 |
| db.influx.large | 2 | 16 | 500 |
| db.influx.xlarge | 4 | 32 | 500–1000 |
| db.influx.2xlarge | 8 | 64 | 1000 |
| db.influx.4xlarge | 16 | 128 | 1000–2000 |
| db.influx.8xlarge | 32 | 256 | 2000–5000 |
| db.influx.12xlarge+ | 48+ | 384+ | 5000–10000 |
