Fix for idempotent producer fatal errors, triggered after a possibly persisted message state #4438
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pranavrth
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* upstream/master: librdkafka v2.3.0 (confluentinc#4455) Fix for idempotent producer fatal errors, triggered after a possibly persisted message state (confluentinc#4438) Move can_q_contain_fetched_msgs inside q_serve (confluentinc#4431) [KIP-580] Exponential Backoff with Mock Broker Changes to Automate Testing. (confluentinc#4422) Update only the mklove version of OpenSSL to 3.0.11 (confluentinc#4454) Permanent errors during offset validation should be retried (confluentinc#4447) Increased flexver request size for Metadata request to include topic_id size (confluentinc#4453) Fix loop of OffsetForLeaderEpoch requests on quick leader changes (confluentinc#4433) Fix for stored offsets not being committed if they lacked the leader epoch (confluentinc#4442) Add leader epoch to control messages (confluentinc#4434) Refactored tmpabuf and fixed an insufficient buffer allocation (confluentinc#4449) Work around KIP-700 restrictions for DescribeCluster [KIP-430] [admin] KIP-430: Add authorized operations to describe API Fix segfault if assignor state is NULL, (confluentinc#4381)
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After a possibly persisted error, such as a disconnection or a timeout, next expected sequence was increased, leading to a fatal error if the message wasn't persisted and the second one in queue failed with an
OUT_OF_ORDER_SEQUENCE_NUMBER.The error could contain the message "sequence desynchronization" with just one possibly persisted error or "rewound sequence number" in case of multiple errored messages.
Solved by treating the possible persisted message as not persisted, and expecting a
DUPLICATE_SEQUENCE_NUMBERerror in case it was orNO_ERRORin case it wasn't, in both cases the message will be considered delivered.