Silent CDC Failures and Timeout Detection: Building Durable Alerting | Streamkap Blog

In an exploration of Change Data Capture (CDC) failure detection and alerting, the text emphasizes the importance of monitoring latency creep and recovery strategies to prevent silent data losses that can occur without clear logs or alerts. It advocates for tracking Write-Ahead Logging (WAL) slot lag and consumer group lag, rather than simply the connector state, as subtle latency increases can be more costly than outright crashes. The piece outlines the need for durable log-position recovery to avoid re-snapshots during connector restarts, provided the replication slot is intact. Additionally, it stresses the importance of routing alerts by severity to enable actionable notifications across platforms like Slack, Datadog, and PagerDuty, thus preventing alert desensitization and ensuring that critical issues are promptly addressed while maintaining a record for future diagnostics.

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