Kafka Streams 101: Joins (2023)

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Kafka Streams offers three types of joins: stream-stream, stream-table, and table-table.

Follow along as we explain which available join methods are suitable for each type.

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Комментарии
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Does the key need to be partition key?

vermoidvermoid
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I have just one question about the stream-stream join. When we have 1 record on the left and 2 on the right (which both fit within the window given), how does this get handled. Would it produce 2 records? One for either record on the right. Or would it produce just one (which it then would have to do at the end of the window I guess)?

Also when we have 2 records on the left, and just a bit later two on the right come in (all with the same key and within the window), would it then produce 4 records, or just 2 (or 1) as it just takes the latest on the left.

TheThijsieBoy
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Are foreign key joins possible in a stream-stream join scenario?
So foreign key of the left table is primary key of the right table. Is this at all possible to handle in kafka?

ankitm
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I want to use Kafka Stream with Async operations like Future, can I do that, currently I see kafka context is getting null if I try to send Kafka message in Async calls.Is there a way to send kafka message without having a blocking call?

raghavsaxena