chuang-wang-pre opened a new pull request, #68:
URL: https://github.com/apache/doris-kafka-connector/pull/68
Currentlly, if using `io.confluent.connect.transforms.ExtractTopic` or
`org.apache.kafka.connect.transforms.RegexRouter` or other Transformers have
changed the topic of the record, according to the current implementation,
**`doris-kafka-connector` will not successfully submit the consumer offset.**
because in `org.apache.kafka.connect.sink.SinkTask#preCommit`, the topic
corresponds to the original topic before applying any transformations. If the
connector is restarted, it will be consumed repeatedly.
More seriously, by default, **`two_phase_commit` is enabled, data will not
be written to doris** because transactions were not successfully committed in
`org.apache.kafka.connect.sink.SinkTask#preCommit`. But at this point, both the
connector and task are in a normal RUNNING state, and the user is not aware of
this abnormal situation.
Although after version 3.6, Kafka supports originalTopic and can maintain
the mapping between the original topic and offset, lower versions of Kafka do
not support it. So personally, I think it would be better to throw an exception
directly in this situation
For example, for the following configured connector:
> {
> "name":"test_connector",
> "config":{
>
"connector.class":"org.apache.doris.kafka.connector.DorisSinkConnector",
> "topics":"original_topic",
> "tasks.max":"1",
> "doris.topic2table.map":
"original_topic:test_table,transformed_original_topic:test_table",
> "buffer.count.records":"2",
> "buffer.flush.time":"11",
> "buffer.size.bytes":"10000000",
> "doris.urls":"127.0.0.1",
> "doris.user":"root",
> "doris.password":"",
> "doris.http.port":"8030",
> "doris.query.port":"9030",
> "doris.database":"transforms_msg",
> "load.model":"stream_load",
> "transforms": "renameTopic",
> "transforms": "AddPrefix",
> "transforms.AddPrefix.type":
"org.apache.kafka.connect.transforms.RegexRouter",
> "transforms.AddPrefix.regex": ".*",
> "transforms.AddPrefix.replacement": "transformed_$0"
> }
> }
errors will occur when consuming dataļ¼
`Unexpected topic: [transformed_original_topic] in SinkRecord. This may be
caused by a Single Message Transform (SMT) modifying the topic. Please check
your connector configuration.`
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