TLDR: Uber is using MySQL as part of their "Schemalass" key-value store (https://eng.uber.com/schemaless-part-one/), a somewhat unusual use case in which it may be a better choice than PostgreSQL. It's not really an evaluation of MySQL vs. PostgreSQL as relational databases.
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[ 146 ms ] story [ 3414 ms ] threadTLDR: Uber is using MySQL as part of their "Schemalass" key-value store (https://eng.uber.com/schemaless-part-one/), a somewhat unusual use case in which it may be a better choice than PostgreSQL. It's not really an evaluation of MySQL vs. PostgreSQL as relational databases.