[galaxy-user] Fetch Taxonomic Representation on dataset is blank

Hello All I ran a metagenomic analysis on a large dataset, larger than any of the others that I have run successfully. Joining two megablast queries resulted in 370, 163, 941 lines in tabular format. I then ran Fetch taxonomic representation on the data It ran with no error messages however when it was done approximately 3 days later, it was a empty file. Why does this happen? The previous dataset with 16,017,326 lines ran successfully If I redo it, how do I know that three days from now, it will not come back empty again? any suggestions? thanks Ameena