无法将组中的 kafka 主题重置为 1

问题描述

我有一个有两个主题的小组.我正在尝试将其中一个的偏移量重置为 1，但收到一条消息，指出偏移量 (1) 低于主题分区的最早偏移量.

I have a group with two topics. I am trying to reset the offset of one of them to 1 but getting a message that offset (1) is lower than earliest offset for topic partition.

➜  local-kafka_2.12-2.0.0 bin/kafka-consumer-groups.sh --bootstrap-server myserver:1025 --group mygroup --topic mytopic --reset-offsets --to-offset 1 --dry-run
[2019-01-31 21:41:35,664] WARN New offset (1) is lower than earliest offset for topic partition mytopic-0. Value will be set to 121 (kafka.admin.ConsumerGroupCommand$)

TOPIC                          PARTITION  NEW-OFFSET
mytopic                      0          121

当我尝试不同的分区时收到相同的消息:

I get the same message when I try different partitions:

➜  local-kafka_2.12-2.0.0 bin/kafka-consumer-groups.sh --bootstrap-server myserver:1025 --group mygroup --topic mytopic:0,1,2 --reset-offsets --to-offset 1 --dry-run
[2019-01-31 21:43:16,526] WARN New offset (1) is lower than earliest offset for topic partition mytopic-0. Value will be set to 121 (kafka.admin.ConsumerGroupCommand$)
[2019-01-31 21:43:16,528] WARN New offset (1) is higher than latest offset for topic partition mytopic-1. Value will be set to 0 (kafka.admin.ConsumerGroupCommand$)
[2019-01-31 21:43:16,528] WARN New offset (1) is higher than latest offset for topic partition mytopic-2. Value will be set to 0 (kafka.admin.ConsumerGroupCommand$)

TOPIC                      PARTITION  NEW-OFFSET
mytopic                      0          121
mytopic                      1          0
mytopic                      2          0

有没有办法将偏移量设置为 1?或者更好的是，为什么我无法将 kafka 主题重置为 1?

Is there a way I can set the offset to 1? or better yet why am I not able to reset the kafka topic to 1?

推荐答案

这意味着mytopic-2的结束偏移为零，主要是因为这个分区中没有存储记录，所以你不能设置更大的-比零偏移.

This means the end offset for mytopic-2 is zero, largely due to the fact there is no record stored in this partition, so you cannot set a greater-than-zero offset.

新偏移量 (1) 低于主题分区 mytopic-0 的最早偏移量.值将设置为 121

这意味着mytopic-0的起始偏移量是121，这是允许暴露给客户端的最早偏移量，所以你不能为这个分区.可能会更新起始偏移量的情况包括: 1. 日志保留；2.日志截断；3. 发出kafka-delete-records脚本或DeleteRecordsRequest.

This means the start offset for mytopic-0 is 121, which is the earliest offset allowed to be exposed to the client, so you cannot set a lower offset for this partition. Possible situations where start offset will be updated includes: 1. log retention; 2.log truncation; 3. issuing kafka-delete-records script or DeleteRecordsRequest.

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