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num-io-threads
| Default | System logical core count (number of vCPUs) |
| Allowed Values | Integer: 1 – 2,048 |
| Category | Query Execution / I/O |
Detailed Explanation:
Sets the number of threads in the I/O runtime, which handles network I/O, object store operations, and other async I/O tasks. This is separate from the DataFusion query threads.
Recommendation: Set to the number of vCPUs on your instance.
