Joblib worker error

[sawtooth500]

Output:
b_index: 265 Finished backtesting 2024-01-24 @ 05-03-2024 01:32:15 PM - Execution time (HH:MM:SS.xx) : 00:00:08.69
b_index: 266 Finished backtesting 2024-01-25 @ 05-03-2024 01:32:16 PM - Execution time (HH:MM:SS.xx) : 00:00:08.86
b_index: 267 Finished backtesting 2024-01-26 @ 05-03-2024 01:32:17 PM - Execution time (HH:MM:SS.xx) : 00:00:08.69
b_index: 268 Finished backtesting 2024-01-29 @ 05-03-2024 01:32:17 PM - Execution time (HH:MM:SS.xx) : 00:00:08.65
b_index: 269 Finished backtesting 2024-01-30 @ 05-03-2024 01:32:18 PM - Execution time (HH:MM:SS.xx) : 00:00:08.47
b_index: 270 Finished backtesting 2024-01-31 @ 05-03-2024 01:32:19 PM - Execution time (HH:MM:SS.xx) : 00:00:08.49
b_index: 271 Finished backtesting 2024-02-01 @ 05-03-2024 01:32:20 PM - Execution time (HH:MM:SS.xx) : 00:00:08.53
b_index: 272 Finished backtesting 2024-02-02 @ 05-03-2024 01:32:21 PM - Execution time (HH:MM:SS.xx) : 00:00:08.81
b_index: 273 Finished backtesting 2024-02-05 @ 05-03-2024 01:32:21 PM - Execution time (HH:MM:SS.xx) : 00:00:08.62
b_index: 274 Finished backtesting 2024-02-06 @ 05-03-2024 01:32:22 PM - Execution time (HH:MM:SS.xx) : 00:00:08.73
b_index: 275 Finished backtesting 2024-02-07 @ 05-03-2024 01:32:23 PM - Execution time (HH:MM:SS.xx) : 00:00:08.41
b_index: 276 Finished backtesting 2024-02-08 @ 05-03-2024 01:32:24 PM - Execution time (HH:MM:SS.xx) : 00:00:08.65
b_index: 277 Finished backtesting 2024-02-09 @ 05-03-2024 01:32:24 PM - Execution time (HH:MM:SS.xx) : 00:00:08.47
b_index: 278 Finished backtesting 2024-02-12 @ 05-03-2024 01:32:25 PM - Execution time (HH:MM:SS.xx) : 00:00:08.31
b_index: 279 Finished backtesting 2024-02-13 @ 05-03-2024 01:32:26 PM - Execution time (HH:MM:SS.xx) : 00:00:08.42
b_index: 280 Finished backtesting 2024-02-14 @ 05-03-2024 01:32:26 PM - Execution time (HH:MM:SS.xx) : 00:00:08.26
/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/joblib/externals/loky/process_executor.py:752: UserWarning: A worker stopped while some jobs were given to the executor. This can be caused by a too short worker timeout or by a memory leak.
  warnings.warn(
b_index: 281 Finished backtesting 2024-02-15 @ 05-03-2024 01:32:27 PM - Execution time (HH:MM:SS.xx) : 00:00:08.55
b_index: 282 Finished backtesting 2024-02-16 @ 05-03-2024 01:32:28 PM - Execution time (HH:MM:SS.xx) : 00:00:08.50
b_index: 283 Finished backtesting 2024-02-20 @ 05-03-2024 01:32:29 PM - Execution time (HH:MM:SS.xx) : 00:00:08.59
b_index: 284 Finished backtesting 2024-02-21 @ 05-03-2024 01:32:30 PM - Execution time (HH:MM:SS.xx) : 00:00:08.61
b_index: 285 Finished backtesting 2024-02-22 @ 05-03-2024 01:32:31 PM - Execution time (HH:MM:SS.xx) : 00:00:08.51
b_index: 286 Finished backtesting 2024-02-23 @ 05-03-2024 01:32:32 PM - Execution time (HH:MM:SS.xx) : 00:00:08.94
b_index: 287 Finished backtesting 2024-02-26 @ 05-03-2024 01:32:33 PM - Execution time (HH:MM:SS.xx) : 00:00:08.99
b_index: 288 Finished backtesting 2024-02-27 @ 05-03-2024 01:32:33 PM - Execution time (HH:MM:SS.xx) : 00:00:08.96
b_index: 289 Finished backtesting 2024-02-28 @ 05-03-2024 01:32:34 PM - Execution time (HH:MM:SS.xx) : 00:00:08.83
b_index: 290 Finished backtesting 2024-02-29 @ 05-03-2024 01:32:35 PM - Execution time (HH:MM:SS.xx) : 00:00:08.77
b_index: 291 Finished backtesting 2024-03-01 @ 05-03-2024 01:32:35 PM - Execution time (HH:MM:SS.xx) : 00:00:08.75
b_index: 292 Finished backtesting 2024-03-04 @ 05-03-2024 01:32:36 PM - Execution time (HH:MM:SS.xx) : 00:00:08.88
b_index: 293 Finished backtesting 2024-03-05 @ 05-03-2024 01:32:38 PM - Execution time (HH:MM:SS.xx) : 00:00:08.89

So above is another run of joblib. I inserted a variable b_index to be shown in the output - as a reminder my joblib calls function do_backtest() which returns a dataframe - and b_index is inserted into one of the columns of the dataframe. So I thought that if a joblib worker fails, then it does not re-execute and you lose the data - but I guess I was wrong? Every b_index value in the vicinity is executed, and in the resultant dataframe b_index 280 has all the required values. I know that joblib sometimes does not execute all the items in order, my machine has 16 threads and I checked all the b_indexes from 260-300 just to be safe in my resultant dataframe and all the data is there... so even though I got the message, it processed all the data...

But I still don't know what triggers this message, or does it always still process and give me all the data or sometimes not...