How does kafka save the consumption location on the consumer side?
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In kafka, a built-in topic for _ _ consumer_ offsets_* is provided
_ _ consumer_offsets default partition 50
Create a consumer_offsets_group consumer group that ID will use later
Math.abs ("consumer_offsets_group" .hashCode ()) 50
As a result, it was put on section 11.
It can be obtained by the following formula:
View the consumer group offsets:
Bin/kafka-console-consumer.sh-topic _ consumer_offsets-partition 11-bootstrap-server localhost:9092-formatter "kafka.coordinator.group.GroupMetadataManager\ $OffsetsMessageFormatter"-consumer.config config/consumer.properties-from-beginning
Results:
[consumer_offsets_group/* consumer group ID*/,consumer_offsets_test/*topic*/,1/*partition*/]:: OffsetAndMetadata (consumption shift information submitted by offset=4/* * /, leaderEpoch=Optional.empty, metadata=, commitTimestamp=1543567461031, expireTimestamp=None)
[consumer_offsets_group,consumer_offsets_test,0]: OffsetAndMetadata (offset=3, leaderEpoch=Optional.empty, metadata=, commitTimestamp=1543567461031, expireTimestamp=None)
[consumer_offsets_group,consumer_offsets_test,2]: OffsetAndMetadata (offset=4, leaderEpoch=Optional.empty, metadata=, commitTimestamp=1543567461031, expireTimestamp=None)
[consumer_offsets_group,consumer_offsets_test,1]: OffsetAndMetadata (offset=4, leaderEpoch=Optional.empty, metadata=, commitTimestamp=1543567466027, expireTimestamp=None)
[consumer_offsets_group,consumer_offsets_test,0]: OffsetAndMetadata (offset=3, leaderEpoch=Optional.empty, metadata=, commitTimestamp=1543567466027, expireTimestamp=None)
[consumer_offsets_group,consumer_offsets_test,2]: OffsetAndMetadata (offset=4, leaderEpoch=Optional.empty, metadata=, commitTimestamp=1543567466027, expireTimestamp=None)
[consumer_offsets_group,consumer_offsets_test,1]: OffsetAndMetadata (offset=4, leaderEpoch=Optional.empty, metadata=, commitTimestamp=1543567468638, expireTimestamp=None)
[consumer_offsets_group,consumer_offsets_test,0]: OffsetAndMetadata (offset=3, leaderEpoch=Optional.empty, metadata=, commitTimestamp=1543567468638, expireTimestamp=None)
[consumer_offsets_group,consumer_offsets_test,2]: OffsetAndMetadata (offset=4, leaderEpoch=Optional.empty, metadata=, commitTimestamp=1543567468638, expireTimestamp=None)
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