A. Sophie Blee-Goldman created KAFKA-15215:
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Summary: The default.dsl.store config is not compatible with
custom state stores
Key: KAFKA-15215
URL: https://issues.apache.org/jira/browse/KAFKA-15215
Project: Kafka
Issue Type: New Feature
Components: streams
Reporter: A. Sophie Blee-Goldman
Assignee: Almog Gavra
Sort of a bug, sort of a new/missing feature. When we added the long-awaited
default.dsl.store config, it was decided to scope the initial KIP to just the
two out-of-the-box state stores types offered by Streams, rocksdb and
in-memory. The reason being that this would address a large number of the
relevant use cases, and could always be followed up with another KIP for custom
state stores if/when the demand arose.
Of course, since rocksdb is the default anyways, the only beneficiaries of this
KIP right now are the people who specifically want only in-memory stores – yet
custom state stores users are probably by far the ones with the greatest need
for an easier way to configure the store type across an entire application. And
unfortunately, because the config currently relies on enum definitions for the
known OOTB store types, there's not really any way to extend this feature as it
is to work with custom implementations.
I think this is a great feature, which is why I hope to see it extended to the
broader user base. Most likely we'll want to introduce a new config for this,
though whether it replaces the old default.dsl.store config or complements it
will have to be decided during the KIP discussion
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