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https://issues.apache.org/jira/browse/KAFKA-10865?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18038822#comment-18038822
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Barry Evans commented on KAFKA-10865:
-------------------------------------
May I ask if this ticket is still a priority and can be worked on [~rhauch] /
[~upsidedownsmile] ?
I have some free time as I am between jobs, and I would like to contribute to
the Kafka Connect codebase.
> Improve trace-logging for Transformations (including Predicates)
> ----------------------------------------------------------------
>
> Key: KAFKA-10865
> URL: https://issues.apache.org/jira/browse/KAFKA-10865
> Project: Kafka
> Issue Type: Improvement
> Components: connect
> Reporter: Robin Moffatt
> Assignee: Tiago Martins
> Priority: Major
> Labels: newbie
>
> I've been spending [a bunch of time poking around
> SMTs|https://rmoff.net/categories/twelvedaysofsmt/] recently, and one common
> challenge I've had is being able to debug when things don't behave as I
> expect.
>
> I know that there is the {{TransformationChain}} logger, but this only gives
> (IIUC) the input record
> {code:java}
> [2020-12-17 09:38:58,057] TRACE [sink-simulator-day12-00|task-0] Applying
> transformation io.confluent.connect.transforms.Filter$Value to
> SinkRecord{kafkaOffset=10551, timestampType=CreateTime}
> ConnectRecord{topic='day12-sys01', kafkaPartition=0,
> key=2c2ceb9b-8b31-4ade-a757-886ebfb7a398, keySchema=Schema{STRING},
> value=Struct{units=16,product=Founders Breakfast
> Stout,amount=30.41,txn_date=Sat Dec 12 18:21:18 GMT 2020,source=SYS01},
> valueSchema=Schema{io.mdrogalis.Gen0:STRUCT}, timestamp=1608197938054,
> headers=ConnectHeaders(headers=)}
> (org.apache.kafka.connect.runtime.TransformationChain:47)
> {code}
>
> I think it would be really useful to also have trace level logging that
> included:
> - the _output_ of *each* transform
> - the evaluation and result of any `predicate`s
> I have been using
> {{com.github.jcustenborder.kafka.connect.simulator.SimulatorSinkConnector}}
> which is really useful for seeing the final record:
> {code:java}
> [2020-12-17 09:38:58,057] INFO [sink-simulator-day12-00|task-0]
> record.value=Struct{units=16,product=Founders Breakfast
> Stout,amount=30.41,txn_date=Sat Dec 12 18:21:18 GMT 2020,source=SYS01}
> (com.github.jcustenborder.kafka.connect.simulator.SimulatorSinkTask:50)
> {code}
>
> But doesn't include things like topic name (which is often changed by common
> SMTs)
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