auto.offset.reset
时间: 2023-11-01 15:45:57 浏览: 40
Auto.offset.reset is a configuration parameter in Apache Kafka that determines what happens when a consumer joins a consumer group or when it has no previously committed offsets. The parameter specifies where the consumer should start reading messages from the topic partition it's assigned to.
The three possible values for auto.offset.reset are:
- latest: the consumer will read only new messages that are produced after it joins the group.
- earliest: the consumer will read all messages from the beginning of the topic partition, including messages that were produced before the consumer joined the group.
- none: if there are no committed offsets for the consumer, an error will be raised when it tries to read messages.
The default value for auto.offset.reset is latest. It's important to carefully choose the appropriate value for this parameter, as it can affect the behavior of the consumer and the accuracy of the data it reads.