add check if the file is effectively uploaded
add check if the file is effectively uploaded

madhurihn/YCSB_ToyDB,zyguan/ycsb,jaemyoun/YCSB,cricket007/YCSB,madhurihn/YCSB_ToyDB,cricket007/YCSB,zyguan/ycsb,ChristianNavolskyi/YCSB,zyguan/ycsb,cricket007/YCSB,jaemyoun/YCSB,madhurihn/YCSB_ToyDB,brianfrankcooper/YCSB,leschekhomann/YCSB,jaemyoun/YCSB,brianfrankcooper/YCSB,ChristianNavolskyi/YCSB,manolama/YCSB,manolama/YCSB,madhurihn/YCSB_ToyDB,cricket007/YCSB,brianfrankcooper/YCSB,manolama/YCSB,manolama/YCSB,leschekhomann/YCSB,leschekhomann/YCSB,leschekhomann/YCSB,jaemyoun/YCSB,ChristianNavolskyi/YCSB,ChristianNavolskyi/YCSB,zyguan/ycsb,brianfrankcooper/YCSB