When Replicate encounters changes that it can not immediately process it writes them to sorter files on the QLIK server. QIK has said they are essentially memory dumps. The problem is that they are huge in comparison to the same changes being stored as LogStream files. Thus, they can very rapidly fill up the storage space on the QLIK server and cause all tasks to be stopped due to critical disk storage space threshold being reached.
These files should instead be compressed and stored in a more space efficient manner similar to how LogStream files are stored.