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1. Producer idempotence could be done automatically and much more cheaply by optionally integrating support for this on the server.
2. The existing high-level consumer doesn't expose a lot of the more fine grained control of offsets (e.g. to reset your position). We will be working on that soon

Why can't I specify the number of streams parallelism per topic map using wildcard stream as I use static stream handler?

The reason we do not have per-topic parallelism specification in wildcard is that with the wildcard topicFilter, we will not know exactly which topics to consume at the construction time, hence no way to specify per-topic specs.

Brokers

How does Kafka depend on Zookeeper?

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