Why doesn't Bulk API v1 Parallel Mode create batches asynchronously?

Question

I am using the "concurrencyMode": "Parallel" setting in my export.json, but I notice that batches are created sequentially, not in parallel:

1st batch created @ 15:33:20. Completed 15:33:39
2nd batch created @ 15:33:40. Completed 15:33:57
3rd batch created @ 15:33:58. Completed 15:34:15

I expected SFDMU to create batches simultaneously with "concurrencyMode": "Parallel".

Answer

In the current implementation, SFDMU does not create and send bulk batches in parallel threads. The "concurrencyMode": "Parallel" setting instructs Salesforce Bulk API to execute operations in parallel once SFDMU has sent them sequentially. Therefore, batches are always sent sequentially, regardless of the concurrencyMode setting.

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