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Re:Cloud Spanner is now production-ready by philipcristiano on Tuesday May 16, 2017 @02:11PM (#14351870)
CockroachDB is inspired by Spanner and available now. Github page says "CockroachDB is production-ready"

https://github.com/cockroachdb/cockroach

Re:Cloud Spanner is now production-ready by manigandham on Tuesday May 16, 2017 @06:04PM (#14353735)
Also take a look at https://www.pingcap.com/