Just an enumeration of who is using HBase. As regards the title, here’re the relevant quotes from the article:
HBase can’t replace all MySQL installations, says HBase project chair Michael Stack, but unlike MySQL, it’s specifically designed to operate at ginormous scale.
“I don’t foresee StumbleUpon ever giving up on all of its MySQL instances. RDBMSs are just too useful,” [Michael] Stack1 tells The Reg.
Original title and link: HBase: Shops swap MySQL for open source Google mimic (NoSQL databases © myNoSQL)