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Aljoscha Krettek commented on FLINK-20491: ------------------------------------------ release-1.12: 32f07395a86554ceb079a34f0c96356b73e67b99 and previous commits > Support Broadcast Operation in BATCH execution mode > --------------------------------------------------- > > Key: FLINK-20491 > URL: https://issues.apache.org/jira/browse/FLINK-20491 > Project: Flink > Issue Type: Improvement > Components: API / DataStream > Reporter: Aljoscha Krettek > Assignee: Aljoscha Krettek > Priority: Major > Labels: pull-request-available > Fix For: 1.13.0, 1.12.2 > > > Right now, we don't support {{DataStream.connect(BroadcastStream)}} in > {{BATCH}} execution mode. I believe we can add support for this with not too > much work. > The key insight is that we can process the broadcast side before the > non-broadcast side. Initially, we were shying away from this because of > concerns about {{ctx.applyToKeyedState()}} which allows the broadcast side of > the user function to access/iterate over state from the keyed side. We > thought that we couldn't support this. However, since we know that we process > the broadcast side first we know that the keyed side will always be empty > when doing so. We can thus just make this "keyed iteration" call a no-op, > instead of throwing an exception as we do now. -- This message was sent by Atlassian Jira (v8.3.4#803005)