infoverload commented on code in PR #19107: URL: https://github.com/apache/flink/pull/19107#discussion_r859991881
########## docs/content/docs/concepts/glossary.md: ########## @@ -25,182 +25,646 @@ under the License. # Glossary +#### Aggregation + +Aggregation is an operation that takes multiple [records](#record) and aggregates them into a single +record using a user-provided aggregation logic (i.e. counting the number of records). When working with +[DataStreams](#datastream), it generally makes more sense to think in terms of aggregations over finite +[windows](#window), rather than over the entire DataStream, since records availability cannot be assumed +over time, like with traditional database systems. + +#### (Flink) Application + +A Flink application is any user program that submits one or multiple [Flink Jobs](#flink-job) from its +`main()` method. The execution of these jobs can happen in a local JVM or on a remote setup of clusters +with multiple machines. + +The jobs of an application can either be submitted to a long-running [Session Cluster](#session-cluster), +to a dedicated [Application Cluster](#application-cluster), or to a [Job Cluster](#job-cluster). + +#### Application Cluster + +A Flink application cluster is a dedicated [Flink cluster](#(flink)-cluster) that only executes +[Flink jobs](#flink-job) from one [Flink application](#flink-application). The lifetime of the Flink +cluster is bound to the lifetime of the Flink application. + +#### Asynchronous Snapshotting + +A form of [snapshotting](#snapshot) that doesn't impede the ongoing stream processing by allowing an +operator to continue processing while it stores its state snapshot, effectively letting the state +snapshots happen asynchronously in the background. + +#### At-least-once Delivery Guarantee + +A fault-tolerance guarantee and data delivery approach where multiple attempts are made at delivering +an event such that at least one succeeds. This guarantees that nothing is lost, but you may experience +duplicated (correct) results. Review Comment: I think this definition is more about the general concept of At-least-once Delivery Guarantee. Would it be okay to keep like this, you think? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
