Grokking Kafka and Event-Driven Architecture
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When Brokers Fail

These two lines come from one test run of the insurance claims topic. They were printed a few seconds apart, with two of its three brokers stopped, and they describe the same kind of write failing for the same reason:

mode=all FAILED TimeoutException: Expiring 1 record(s) for insurance-claims-0:NNNN ms has passed since batch creation. The request has not been sent, or no server response has been received yet.
mode=all-noretry FAILED NotEnoughReplicasException: Messages are rejected since there are fewer in-sync replicas than required.

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