[jira] [Updated] (FLINK-3514) Add support for slowly changing streaming broadcast variables

["Aljoscha Krettek (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-3514?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aljoscha Krettek updated FLINK-3514:
------------------------------------
    Component/s:     (was: Streaming)
                 DataStream API

> Add support for slowly changing streaming broadcast variables
> -------------------------------------------------------------
>
>                 Key: FLINK-3514
>                 URL: https://issues.apache.org/jira/browse/FLINK-3514
>             Project: Flink
>          Issue Type: New Feature
>          Components: DataStream API
>            Reporter: Stephan Ewen
>
> With "slow changing inputs", I mean auxiliary data sets that change over time. Think about dictionaries, set of rules, etc that are updates at slow rates and then applied onto another stream.
> They are a bit like broadcast variables in the DataSet API, but not constant over the entire lifetime of the job.
> One can currently approximate this via connected streams:
> {code}
> DataStream<Rule> rules = ...
> DataStream<Event> events = ...
> rules.broadcast().connect(events).flatMap(...);
> {code}
> The disadvantage is that one has no control that the broadcasted "rules" input is materialized in the function before the "events" are delivered.



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