Rollup - Error in readListPart()

The cluster was created 15d ago. Here are the p directory sizes of each peer:

323G   
298G
252G    
41G     
41G     
42G     
33G     
33G     
33G     
75G     
74G     
75G     

(you can see I have one group that is hit extremely often with updates, but they compact down much further than that)