kafka怎么保存消费端的消费位置

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在kafka 中，提供了一个 ___consumer_ offsets_* 的一个内置topic

• __consumer_offsets 默认分区50

• 创建consumer_offsets_group 消费组ID 稍后会用到

• Math.abs("consumer_offsets_group".hashCode()) % 50

• 结果放在了11分区上

• 通过如下公式即可获取：

• 查看该消费群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

• 结果：

• [consumer_offsets_group/*消费组ID*/,consumer_offsets_test/*topic*/,1/*partition*/]::OffsetAndMetadata(offset=4/*提交的消费位移信息*/, 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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