frankvicky opened a new pull request, #23176:
URL: https://github.com/apache/kafka/pull/23176
JIRA: KAFKA-20939
KIP-909 changed DNS bootstrap resolution from synchronous (in the client
constructor) to asynchronous (deferred to the first `poll()`). This introduced
a silent breaking change: callers that previously relied on "constructor throws
=> no instance created" would now receive a permanently-broken client instance
that raises `BootstrapResolutionException` from every subsequent API call,
requiring new error-handling paths and an explicit close-and-recreate cycle.
Reuse the existing `bootstrap.resolve.timeout.ms` config to make the mode
selectable:
* `= 0` (new default) — resolve DNS synchronously in the constructor,
surface any failure as `ConfigException` (wrapped in `KafkaException` by the
constructor's outer try/catch); no client instance is created.
* `> 0` — resolve DNS asynchronously; failures surface as
`BootstrapResolutionException` from subsequent API calls, after which
the client must be closed and re-created.
This preserves the pre-KIP-909 behavior for every user who does not
explicitly opt in to the async model, while keeping the async model available
for those who need it.
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