[jira] [Created] (KAFKA-5535) Transformations - tranformations for value broken on tombsone events

["Yelei Wu (JIRA)" <ji...@apache.org>]

Yelei Wu created KAFKA-5535:
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             Summary: Transformations - tranformations for value broken on tombsone events
                 Key: KAFKA-5535
                 URL: https://issues.apache.org/jira/browse/KAFKA-5535
             Project: Kafka
          Issue Type: Bug
          Components: KafkaConnect
    Affects Versions: 0.10.2.1
         Environment: Unbuntu 14.04
Java 8
            Reporter: Yelei Wu
             Fix For: 0.10.2.2


I'm trying to use the transformation for Kafka Connect and running into issues.

The tranformation configuration is:
-----------------
"transforms": "GetAfter",
"transforms.GetAfter.type": "org.apache.kafka.connect.transforms.ExtractField$Value",
"transforms.GetAfter.field": "after",
-----------------
And I got the following errors occasionally：
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org.apache.kafka.connect.errors.DataException: Only Map objects supported in absence of schema for [field extraction], found: null
	at org.apache.kafka.connect.transforms.util.Requirements.requireMap(Requirements.java:38)
	at org.apache.kafka.connect.transforms.ExtractField.apply(ExtractField.java:57)
	at org.apache.kafka.connect.runtime.TransformationChain.apply(TransformationChain.java:39)
	at org.apache.kafka.connect.runtime.WorkerSinkTask.convertMessages(WorkerSinkTask.java:408)
	at org.apache.kafka.connect.runtime.WorkerSinkTask.poll(WorkerSinkTask.java:249)
	at org.apache.kafka.connect.runtime.WorkerSinkTask.iteration(WorkerSinkTask.java:179)
	at org.apache.kafka.connect.runtime.WorkerSinkTask.execute(WorkerSinkTask.java:148)
	at org.apache.kafka.connect.runtime.WorkerTask.doRun(WorkerTask.java:139)
	at org.apache.kafka.connect.runtime.WorkerTask.run(WorkerTask.java:182)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
----------------- 
Seems that tombstone events break the transformation, but after checking the source code for Transformations on Value (ExtractField$Value, ValueToKey, MaskField$Value, ReplaceField$Value), none of them handles tombstone events explicitly, none of them work through Tombstone events neither.
Null check in those transformations may be nessesary.



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