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Merged
stankiewicz merged 2 commits into from
Sep 25, 2026
Merged

Tag the Kafka write error output with the schema it actually emits #39760

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5764db9
Tag the Kafka write error output with the schema it actually emits
PDGGK Aug 15, 2026
325730a
Add CHANGES.md entry for the Kafka write error schema fix
PDGGK Sep 23, 2026
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1 change: 1 addition & 0 deletions CHANGES.md
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Expand Up @@ -81,6 +81,7 @@
## Bugfixes

* (Go) Fixed a data race on the Prism runner's artifact cache map in JobServices ([#32656](https://github.com/apache/beam/issues/32656)).
* (Java) Fixed the declared schema of the error output of the Kafka write SchemaTransform, which wrapped the error schema a second time and did not match the rows it emits ([#39760](https://github.com/apache/beam/issues/39760)).
* Fixed X (Java/Python) ([#X](https://github.com/apache/beam/issues/X)).

## Security Fixes
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3 changes: 1 addition & 2 deletions ...o/kafka/src/main/java/org/apache/beam/sdk/io/kafka/KafkaWriteSchemaTransformProvider.java
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Expand Up @@ -294,8 +294,7 @@ public PCollectionRowTuple expand(PCollectionRowTuple input) {
}

// TODO: include output from KafkaIO Write once updated from PDone
PCollection<Row> errorOutput =
outputTuple.get(ERROR_TAG).setRowSchema(ErrorHandling.errorSchema(errorSchema));
PCollection<Row> errorOutput = outputTuple.get(ERROR_TAG).setRowSchema(errorSchema);
return PCollectionRowTuple.of(
handleErrors ? configuration.getErrorHandling().getOutput() : "errors", errorOutput);
}
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24 changes: 24 additions & 0 deletions ...fka/src/test/java/org/apache/beam/sdk/io/kafka/KafkaWriteSchemaTransformProviderTest.java
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Expand Up @@ -50,6 +50,7 @@
import org.apache.beam.sdk.transforms.SerializableFunction;
import org.apache.beam.sdk.values.KV;
import org.apache.beam.sdk.values.PCollection;
import org.apache.beam.sdk.values.PCollectionRowTuple;
import org.apache.beam.sdk.values.PCollectionTuple;
import org.apache.beam.sdk.values.Row;
import org.apache.beam.sdk.values.TupleTag;
Expand Down Expand Up @@ -280,6 +281,29 @@ public void testBuildTransformWithManaged() {
}
}

@Test
public void testErrorOutputCarriesTheSchemaErrorCounterFnEmits() {
// The output schema is fixed while the graph is built, so this needs no runner.
p.enableAbandonedNodeEnforcement(false);

Schema inputSchema = Schema.builder().addByteArrayField("bytes").build();
KafkaWriteSchemaTransformProvider.KafkaWriteSchemaTransformConfiguration configuration =
KafkaWriteSchemaTransformProvider.KafkaWriteSchemaTransformConfiguration.builder()
.setFormat("RAW")
.setTopic("test-topic")
.setBootstrapServers("host:9092")
.setErrorHandling(ErrorHandling.builder().setOutput("errors").build())
.build();

PCollectionRowTuple output =
PCollectionRowTuple.of("input", p.apply(Create.empty(inputSchema)))
.apply(new KafkaWriteSchemaTransformProvider().from(configuration));

// ErrorCounterFn emits ErrorHandling.errorRecord(errorSchema, ...), where errorSchema is
// already ErrorHandling.errorSchema(inputSchema).
assertEquals(ErrorHandling.errorSchema(inputSchema), output.get("errors").getSchema());
}

@Test
public void testKafkaWriteSchemaTransformConfigurationSchema() throws NoSuchSchemaException {
Schema schema =
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