The dancing balloon-like lights moving in time to the backing track of Michael Jackson’s Thriller was merely the entrée for the entertainment that was to follow. The stage at Dublin’s convention centre, a largely glass structure adjacent to the newish, harp-like Samuel Beckett bridge over the Liffey, was soon swamped with Bodhran players and the impressively fast clicking heels of traditional Irish dancers. All good local stuff. Slightly less impressive were the keynotes at this year’s Hadoop Summit. Too salesy and too egocentric, it was easy to forget this was an open source event celebrating the future of connected data.