ClickHouse/docs/en/introduction/use_case.rst

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Usage in Yandex.Metrica and other Yandex services
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ClickHouse is used for multiple purposes in Yandex.Metrica. Its main task is to build reports in online mode using non-aggregated data. It uses a cluster of 374 servers, which store over 20.3 trillion rows in the database. The volume of compressed data, without counting duplication and replication, is about 2 PB. The volume of uncompressed data (in TSV format) would be approximately 17 PB.
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ClickHouse is also used for:
* Storing WebVisor data.
* Processing intermediate data.
* Building global reports with Analytics.
* Running queries for debugging the Metrica engine.
* Analyzing logs from the API and the user interface.
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ClickHouse has at least a dozen installations in other Yandex services: in search verticals, Market, Direct, business analytics, mobile development, AdFox, personal services, and others.