rafaelsms opened a new issue, #28034: URL: https://github.com/apache/beam/issues/28034
### What happened? Hello! Sorry if this is a duplicate. To be honest, I don't know much about Apache Beam and Dataflow, so I am still learning and might be doing something wrong, let me know :) I attempted to create a somewhat minimal example below. The exception is thrown by a pipeline that just reads an entry from Datastore when running on `DataflowRunner`. It works and succeeds when using `DirectRunner`. The validation code was added in the PR #26675, throwing at [this line](https://github.com/apache/beam/blob/a434a31507895ecfef3be94bdc1729cf376ebf56/runners/core-construction-java/src/main/java/org/apache/beam/runners/core/construction/graph/PipelineValidator.java#L221). Example code: ```java private static Read buildQueryTransform(Options options, String kind, String column3Value) { Query.Builder queryBuilder = Query.newBuilder(); queryBuilder.addKindBuilder().setName(kind); queryBuilder.addProjection(makeProjection(COLUMN_NAME_1)); queryBuilder.addProjection(makeProjection(COLUMN_NAME_2)); queryBuilder.setFilter(makeFilter(COLUMN_NAME_3, Operator.EQUAL, makeValue(column3Value))); Query query = queryBuilder.build(); return DatastoreIO.v1().read().withProjectId(options.getDataset()).withQuery(query); } private static Projection.Builder makeProjection(String propertyName) { Projection.Builder prjBuilder = Projection.newBuilder(); prjBuilder.setProperty(makePropertyReference(propertyName)); return prjBuilder; } public static void main(String[] args) { // ... Pipeline pipeline = Pipeline.create(options); // ... Read reader = buildQueryTransform(options, sourceKind, value); pipeline.apply("Read " + value + " from " + sourceKind, reader); // ... PipelineResult result = pipeline.run(); // throws IllegalArgumentException // ... } ``` Exception thrown: ``` SEVERE: Unexpected error in Dataflow job java.lang.IllegalArgumentException: Transform Read-[column 3 value]-from-[datastore kind name]-Create-Values-Read-CreateSource--Impulse is not a composite transform but does not have a specified URN. outputs { key: "org.apache.beam.sdk.values.PCollection.<init>:397#bb20b45fd4d95138" value: "Read [column 3 value] from [datastore kind name]/Create.Values/Read(CreateSource)/Impulse.out" } unique_name: "Read [column 3 value] from [datastore kind name]/Create.Values/Read(CreateSource)/Impulse" at org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkArgument(Preconditions.java:440) at org.apache.beam.runners.core.construction.graph.PipelineValidator.validateTransform(PipelineValidator.java:219) at org.apache.beam.runners.core.construction.graph.PipelineValidator.validateComponents(PipelineValidator.java:121) at org.apache.beam.runners.core.construction.graph.PipelineValidator.validate(PipelineValidator.java:101) at org.apache.beam.runners.core.construction.PipelineTranslation.toProto(PipelineTranslation.java:106) at org.apache.beam.runners.dataflow.DataflowRunner.run(DataflowRunner.java:1122) at org.apache.beam.runners.dataflow.DataflowRunner.run(DataflowRunner.java:198) at org.apache.beam.sdk.Pipeline.run(Pipeline.java:321) at org.apache.beam.sdk.Pipeline.run(Pipeline.java:307) at [our main class].main(MainDataflowJob.java:120) ``` Other log related to this unique name: ```xml <record> <date>2023-08-16T13:56:55</date> <millis>1692205015473</millis> <sequence>278</sequence> <logger>org.apache.beam.sdk.runners.TransformHierarchy</logger> <level>FINE</level> <class>org.apache.beam.sdk.runners.TransformHierarchy$Node</class> <method>visit</method> <thread>1</thread> <message>Visiting primitive node Node{fullName=Read [column 3 value] from [datastore kind name]/Create.Values/Read(CreateSource)/Impulse, transform=Impulse}</message> </record> <record> <date>2023-08-16T13:56:55</date> <millis>1692205015473</millis> <sequence>279</sequence> <logger>org.apache.beam.sdk.runners.TransformHierarchy</logger> <level>FINE</level> <class>org.apache.beam.sdk.runners.TransformHierarchy$Node</class> <method>visit</method> <thread>1</thread> <message>Visiting output value Read [column 3 value] from [datastore kind name]/Create.Values/Read(CreateSource)/Impulse.out [PCollection@1917161212]</message> </record> ``` ### Issue Priority Priority: 2 (default / most bugs should be filed as P2) ### Issue Components - [ ] Component: Python SDK - [X] Component: Java SDK - [ ] Component: Go SDK - [ ] Component: Typescript SDK - [ ] Component: IO connector - [ ] Component: Beam examples - [ ] Component: Beam playground - [ ] Component: Beam katas - [ ] Component: Website - [ ] Component: Spark Runner - [ ] Component: Flink Runner - [ ] Component: Samza Runner - [ ] Component: Twister2 Runner - [ ] Component: Hazelcast Jet Runner - [X] Component: Google Cloud Dataflow Runner -- This is an automated message from the Apache Git Service. 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