Sharing one article about the difference between hive.mapjoin.smalltable.filesize and hive.auto.convert.join.noconditionaltask.size. Although both of them can control the behavior of map join.
http://www.openkb.info/2016/01/difference-between-hivemapjoinsmalltabl.html -- Thanks, www.openkb.info (Open KnowledgeBase for Hadoop/Database/OS/Network/Tool)
