I've tried to import some LevelDB files and it looks like it is working until it reaches 99% and it has been there for the last 30 minutes.
['Data View', 'Importing Data', u'ILSVRC2012_img_train_1452859123.16', 2, u'Importing of Data has started for data ILSVRC2012_img_train from location /media/data1/ImageNet/ILSVRC2012_img_train_ldb', 99, False]
['Data View', 'Importing Data', u'ILSVRC2012_img_val_1452859206.24', 2, u'Importing of Data has started for data ILSVRC2012_img_val from location /media/data1/ImageNet/ILSVRC2012_img_val_ldb', 99, False]
['Data View', 'Importing Data', u'ILSVRC2012_img_test_1452859636.01', 2, u'Importing of Data has started for data ILSVRC2012_img_test from location /media/data1/ImageNet/ILSVRC2012_img_test_ldb', 99, False]
I generated the LevelDB using the convert_imageset tool compiled with caffe.