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template, use ByteBuffer[] for performance?
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change gradle to kotlin? (it's worse if not use plugins block)
refer to https://docs.gradle.org/current/userguide/kotlin_dsl.html#sec:kotlin_using_standard_api)
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impl own json bind by referring https://github.com/json-iterator/java and https://github.com/ngs-doo/dsl-json with annotation processor?
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framework error (queue listener, background task error, custom scheduler trigger) forward to kafka?
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redis using ping/pong to validate connection? for zero downtime upgrading e.g. with gcloud memory store
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websocket, replace AbstractReceiveListener, so it can include IO/error handling within action lifecycle?
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use adminClient to check kafka ready? or retry sending message?
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mongo: monitor thru mongo command, db.stats()?
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db: support json column (syntax sugar of String<->JSON)