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One a week, from production practice: TiDB, and the Prometheus, VictoriaMetrics and Grafana stack around it.
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TiDB EngineeringA TiDB backup nobody has restored is an assumption, not a recovery plan
The usual TiDB backup failure is not a missing backup. It is one that has never been restored, so nobody knows whether it works or how long it takes.
TiDB EngineeringFast yesterday, slow today: when a TiDB plan flips without a code change
A TiDB query that was fast yesterday is slow today, and nobody touched the code. Before rewriting the SQL, check the statistics the optimizer planned from.
TiDB EngineeringTiDB looks like MySQL until you ask where the query runs
A MySQL client connects to TiDB and nothing looks different. Behind that connection are TiDB servers, TiKV nodes and PD, and the surprises come from how they interact.