Add a resourse for threads, and make it FixedInteger, Then restart record, And click on " Thread Number " on the left upper corner, Then add your threads resourse inside it.
If I am running a script and one thread fails, the data used for it will disappear from the source and I cannot see which one has to be reused.
There is no way to know which data was taken, 'cause the thread had deleted all things used before. But u could log data used before the thread will be crashed.