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Re:The New HAProxy Data Plane API: Two Examples of Programma... by bndw on Monday July 01, 2019 @02:30PM (#20328279)
Envoy's xDS APIs work with snapshots of configuration data that are compiled externally and sent to Envoy.

HAProxy's API looks like more of a transactional RPC API and HAProxy manages the configuration internally.

Re:The New HAProxy Data Plane API: Two Examples of Programma... by aiharos on Tuesday July 02, 2019 @06:07AM (#20333666)
Transactions are an optional part of the API to allow change over multiple API resources atomically.

Getting an entire snapshot of configuration data is quite compatible with this, since then the explicit use of transactions is not necessary and the dataplane can take care of it on its own.