The Insatiable Postgres Replication Slot
Read OriginalA technical deep dive into diagnosing unexpected Write-Ahead Log (WAL) growth and rapid disk space consumption in an idle Amazon RDS Postgres database. The article details how an inactive logical replication slot, created for a CDC demo with Apache Flink, caused ~18 GB/day of WAL retention. It includes steps to reproduce the issue, analyze relevant Postgres metrics, and identify the root cause.
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