File_is_ready -

Data warehouses wait for this flag before starting "Extract, Transform, Load" jobs to avoid reading truncated data.

In asynchronous programming and distributed systems, operations involving files (like downloading, uploading, or processing large datasets) rarely happen instantaneously. The file_is_ready flag serves as a synchronization mechanism, signaling to dependent processes that a file is complete, validated, and safe to access. file_is_ready

Systems often use "atomic renames." A file is written to a temporary name (e.g., temp_file.part ) and only renamed to the final filename when complete. The existence of the final filename acts as the file_is_ready signal. Conclusion Data warehouses wait for this flag before starting

Producers send a message to a queue (like RabbitMQ) only after the file is successfully written to storage. Systems often use "atomic renames

Data is being streamed or written; the file is "locked."