spark-3.0.0-preview-bin-without-hadoop.tgz: 
BF40C068 48E90CB5 84CEAA03 6A753FDA 7AADE8D0 F1F5475D 665F2F70 6568CB57 E9CDA1D2
 7133A3E5 BA0FE87B ECDF0C2C 9F45C83F 3515F2B4 DBEF6520 BC1795AD