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https://issues.apache.org/jira/browse/KAFKA-5535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16095737#comment-16095737
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ASF GitHub Bot commented on KAFKA-5535:
---------------------------------------
GitHub user ewencp opened a pull request:
https://github.com/apache/kafka/pull/3559
KAFKA-5535: Handle null values in ExtractField
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ewencp/kafka kafka-5535-extract-field-null
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/kafka/pull/3559.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #3559
----
commit d8ffc8b4300cc2a0ee047af941dd4eb3bfcfd58f
Author: Ewen Cheslack-Postava <m...@ewencp.org>
Date: 2017-07-21T03:55:26Z
KAFKA-5535: Handle null values in ExtractField
----
> Transformations - tranformations for value broken on tombstone 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
> Labels: newbie
>
> 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$Value",
> "transforms.GetAfter.field": "after",
> -----------------
> And I got the following errors occasionally：
> -----------------
> org.apache.kafka.connect.errors.DataException: Only Map objects supported in
> absence of schema for [field extraction], found: null
> at
> org.apache.kafka.connect.transforms.util.Requirements.requireMap(Requirements.java:38)
> at
> org.apache.kafka.connect.transforms.ExtractField.apply(ExtractField.java:57)
> at
> org.apache.kafka.connect.runtime.TransformationChain.apply(TransformationChain.java:39)
> at
> org.apache.kafka.connect.runtime.WorkerSinkTask.convertMessages(WorkerSinkTask.java:408)
> at
> org.apache.kafka.connect.runtime.WorkerSinkTask.poll(WorkerSinkTask.java:249)
> at
> org.apache.kafka.connect.runtime.WorkerSinkTask.iteration(WorkerSinkTask.java:179)
> at
> org.apache.kafka.connect.runtime.WorkerSinkTask.execute(WorkerSinkTask.java:148)
> at
> org.apache.kafka.connect.runtime.WorkerTask.doRun(WorkerTask.java:139)
> at org.apache.kafka.connect.runtime.WorkerTask.run(WorkerTask.java:182)
> at
> java.util.concurrent.Executors$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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