zhangyue19921010 commented on pull request #10551:
URL: https://github.com/apache/druid/pull/10551#issuecomment-736260071
@himanshug Thanks for your review.
> does the problem happen if `isolation.level=read_uncommitted` ?
No problem will happen . When set `isolation.level` `read_uncommitted`,
Druid can consume higher version Kafka un-transactionally and Druid also can
consume lower version Kafka.
I just change the strategy for setting `isolation.level` in
`KafkaConsumerConfigs.getConsumerProperties()`.
`props.put("isolation.level",
customerConsumerProperties.getOrDefault("isolation.level", "read_committed"));`
If users ignore this parameter, Druid will set `isolation.level`
`read_committed` by default.
If users set `isolation.level` `read_committed` or set `isolation.level`
`read_uncommitted` in `ConsumerProperties`, Druid will set this parameter as
required by the user. In other words, user-property has a higher priority.
**This solution makes code changes lighter and safer. And this solution also
don't change current behavior of Kafka consumption and provide a way to make
Druid has the ability to consume lower versions of Kafka.**
PTAL :)
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