Matthias J. Sax created KAFKA-6687:
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Summary: Allow to read a topic multiple times
Key: KAFKA-6687
URL: https://issues.apache.org/jira/browse/KAFKA-6687
Project: Kafka
Issue Type: Improvement
Components: streams
Reporter: Matthias J. Sax
Users often want to read topic multiple times. However, this is not possible
because there is a single consumer and thus a topic can only be consumed once.
Users get an exception
{quote}Exception in thread “main”
org.apache.kafka.streams.errors.TopologyException: Invalid topology: Topic
source has already been registered by another source.
{quote}
If they use a topic name in multiple `stream()`, `table()`, `globalTable()`
calls.
However, with KAFKA-6034 in place, we could allow adding a topic multiple times
and rewrite the topology internally to only read the topic once. This would
simplify application code as users don't need to put workaround in place to get
the same behavior.
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