reuvenlax commented on code in PR #38058:
URL: https://github.com/apache/beam/pull/38058#discussion_r3126100928


##########
sdks/java/io/google-cloud-platform/src/test/java/org/apache/beam/sdk/io/gcp/bigquery/StorageApiDataTriggeredSchemaUpdateIT.java:
##########
@@ -0,0 +1,338 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.sdk.io.gcp.bigquery;
+
+import static 
org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.MoreObjects.firstNonNull;
+import static org.junit.Assert.assertEquals;
+
+import com.google.api.services.bigquery.model.Table;
+import com.google.api.services.bigquery.model.TableFieldSchema;
+import com.google.api.services.bigquery.model.TableReference;
+import com.google.api.services.bigquery.model.TableRow;
+import com.google.api.services.bigquery.model.TableSchema;
+import com.google.auto.value.AutoValue;
+import java.io.IOException;
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+import org.apache.beam.sdk.Pipeline;
+import org.apache.beam.sdk.extensions.gcp.options.GcpOptions;
+import org.apache.beam.sdk.io.gcp.bigquery.BigQueryIO.Write;
+import org.apache.beam.sdk.io.gcp.bigquery.BigQueryIO.Write.CreateDisposition;
+import org.apache.beam.sdk.io.gcp.bigquery.BigQueryIO.Write.WriteDisposition;
+import org.apache.beam.sdk.io.gcp.testing.BigqueryClient;
+import org.apache.beam.sdk.state.StateSpec;
+import org.apache.beam.sdk.state.StateSpecs;
+import org.apache.beam.sdk.state.ValueState;
+import org.apache.beam.sdk.testing.TestPipeline;
+import org.apache.beam.sdk.transforms.Create;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.ParDo;
+import org.apache.beam.sdk.transforms.WithKeys;
+import org.apache.beam.sdk.values.KV;
+import org.apache.beam.sdk.values.PCollection;
+import 
org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableList;
+import 
org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableSet;
+import 
org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.Iterables;
+import org.joda.time.Duration;
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TestName;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Integration test for BigQueryIO Storage Write API auto schema upgrade 
triggered by data.
+ *
+ * <p>Uses a Stateful DoFn to sequence elements ensuring base schema elements 
are written before
+ * evolved schema elements, avoiding race conditions in distributed execution.
+ */
+@RunWith(JUnit4.class)
+public class StorageApiDataTriggeredSchemaUpdateIT {
+  private static final Logger LOG =
+      LoggerFactory.getLogger(StorageApiDataTriggeredSchemaUpdateIT.class);
+
+  private static final BigqueryClient BQ_CLIENT =
+      new BigqueryClient("StorageApiDataTriggeredSchemaUpdateIT");
+  private static final String PROJECT =
+      TestPipeline.testingPipelineOptions().as(GcpOptions.class).getProject();
+  private static final String BIG_QUERY_DATASET_ID =
+      "storage_api_data_triggered_schema_update_" + System.nanoTime();
+
+  private static String bigQueryLocation;
+
+  @Rule public TestName testName = new TestName();
+
+  @BeforeClass
+  public static void setUpTestEnvironment() throws IOException, 
InterruptedException {
+    bigQueryLocation =
+        
TestPipeline.testingPipelineOptions().as(TestBigQueryOptions.class).getBigQueryLocation();
+    BQ_CLIENT.createNewDataset(PROJECT, BIG_QUERY_DATASET_ID, null, 
bigQueryLocation);
+  }
+
+  @AfterClass
+  public static void cleanUp() {
+    LOG.info("Cleaning up dataset {} and tables.", BIG_QUERY_DATASET_ID);
+    BQ_CLIENT.deleteDataset(PROJECT, BIG_QUERY_DATASET_ID);
+  }
+
+  private String createTable(TableSchema tableSchema) throws IOException, 
InterruptedException {
+    String tableId = testName.getMethodName().replace("[", "_").replace("]", 
"_");
+    BQ_CLIENT.deleteTable(PROJECT, BIG_QUERY_DATASET_ID, tableId);
+    BQ_CLIENT.createNewTable(
+        PROJECT,
+        BIG_QUERY_DATASET_ID,
+        new Table()
+            .setSchema(tableSchema)
+            .setTableReference(
+                new TableReference()
+                    .setTableId(tableId)
+                    .setDatasetId(BIG_QUERY_DATASET_ID)
+                    .setProjectId(PROJECT)));
+    return tableId;
+  }
+
+  static class SequenceRowsDoFn extends DoFn<KV<Integer, Integer>, TableRow> {
+    private static final String COUNTER = "counter";
+
+    @StateId(COUNTER)
+    @SuppressWarnings("unused")
+    private final StateSpec<ValueState<Integer>> counterSpec = 
StateSpecs.value();
+
+    private final int stride;
+
+    public SequenceRowsDoFn(int stride) {
+      this.stride = stride;
+    }
+
+    @ProcessElement
+    public void processElement(ProcessContext c, @StateId(COUNTER) 
ValueState<Integer> counter) {
+      int current = firstNonNull(counter.read(), 0);
+      c.output(getRow(current));
+      counter.write(++current);
+    }
+
+    TableRow getRow(int i) {
+      TableRow row = new TableRow().set("name", "name" + i).set("number", 
Long.toString(i));
+      if (i < stride) {
+        row = row.set("req", "foo");
+      } else {
+        row = row.set("new1", "blah" + i);
+        row = row.set("new2", "baz" + i);
+
+        if (i >= 2 * stride) {
+          TableRow nested =
+              new TableRow()
+                  .set("nested_field1", "nested1" + i)
+                  .set("nested_field2", "nested2" + i);
+
+          if (i >= 3 * stride) {
+            TableRow doubleNested =
+                new TableRow().set("double_nested_field1", "double_nested1" + 
i);
+            nested = nested.set("double_nested", doubleNested);
+
+            // Add a repeated struct to ensure that we capture this code path 
as well.
+            TableRow repeatedNested1 =
+                new TableRow().set("repeated_nested_field1", 
"repeated_nested1" + i);
+            TableRow repeatedNested2 =
+                new TableRow().set("repeated_nested_field2", 
"repeated_nested2" + i);
+            nested =
+                nested.set("repeated_nested", 
ImmutableList.of(repeatedNested1, repeatedNested2));
+          }
+          row.set("nested", nested);
+        }
+      }
+      return row;
+    };
+  }
+
+  @Test
+  public void testDataTriggeredSchemaUpgradeExactlyOnce() throws Exception {
+    runTest(Write.Method.STORAGE_WRITE_API);
+  }
+
+  @Test
+  public void testDataTriggeredSchemaUpgradeAtLeastOnce() throws Exception {
+    runTest(Write.Method.STORAGE_API_AT_LEAST_ONCE);
+  }
+
+  private void runTest(Write.Method method) throws Exception {
+    Pipeline p = Pipeline.create(TestPipeline.testingPipelineOptions());
+    
p.getOptions().as(BigQueryOptions.class).setSchemaUpgradeBufferingShards(1);
+
+    TableSchema baseSchema =
+        new TableSchema()
+            .setFields(
+                ImmutableList.of(
+                    new TableFieldSchema().setName("number").setType("INT64"),
+                    new TableFieldSchema().setName("name").setType("STRING"),
+                    new 
TableFieldSchema().setName("req").setType("STRING").setMode("REQUIRED")));
+    TableSchema evolvedSchema =
+        new TableSchema()
+            .setFields(
+                ImmutableList.of(
+                    new 
TableFieldSchema().setName("number").setType("INT64").setMode("NULLABLE"),
+                    new 
TableFieldSchema().setName("name").setType("STRING").setMode("NULLABLE"),
+                    new 
TableFieldSchema().setName("req").setType("STRING").setMode("NULLABLE"),
+                    new 
TableFieldSchema().setName("new1").setType("STRING").setMode("NULLABLE"),
+                    new 
TableFieldSchema().setName("new2").setType("STRING").setMode("NULLABLE"),
+                    new TableFieldSchema()
+                        .setName("nested")
+                        .setType("STRUCT")
+                        .setMode("NULLABLE")
+                        .setFields(
+                            ImmutableList.of(
+                                new TableFieldSchema()
+                                    .setName("nested_field1")
+                                    .setType("STRING")
+                                    .setMode("NULLABLE"),
+                                new TableFieldSchema()
+                                    .setName("nested_field2")
+                                    .setType("STRING")
+                                    .setMode("NULLABLE"),
+                                new TableFieldSchema()
+                                    .setName("double_nested")
+                                    .setType("STRUCT")
+                                    .setMode("NULLABLE")
+                                    .setFields(
+                                        ImmutableList.of(
+                                            new TableFieldSchema()
+                                                
.setName("double_nested_field1")
+                                                .setType("STRING")
+                                                .setMode("NULLABLE"))),
+                                new TableFieldSchema()
+                                    .setName("repeated_nested")
+                                    .setType("STRUCT")
+                                    .setMode("REPEATED")
+                                    .setFields(
+                                        ImmutableList.of(
+                                            new TableFieldSchema()
+                                                
.setName("repeated_nested_field1")
+                                                .setType("STRING")
+                                                .setMode("NULLABLE"),
+                                            new TableFieldSchema()
+                                                
.setName("repeated_nested_field2")
+                                                .setType("STRING")
+                                                .setMode("NULLABLE")))))));
+
+    String tableId = createTable(baseSchema);
+    String tableSpec = PROJECT + ":" + BIG_QUERY_DATASET_ID + "." + tableId;
+
+    List<Integer> dummyInputs = IntStream.range(0, 
20).boxed().collect(Collectors.toList());
+
+    BigQueryIO.Write<TableRow> write =
+        BigQueryIO.writeTableRows()
+            .to(tableSpec)
+            .withMethod(method)
+            .withSchemaUpdateOptions(
+                ImmutableSet.of(
+                    Write.SchemaUpdateOption.ALLOW_FIELD_ADDITION,
+                    Write.SchemaUpdateOption.ALLOW_FIELD_RELAXATION))
+            .withCreateDisposition(CreateDisposition.CREATE_NEVER)
+            .withWriteDisposition(WriteDisposition.WRITE_APPEND);
+    if (method == Write.Method.STORAGE_WRITE_API) {
+      write =
+          write
+              .withTriggeringFrequency(Duration.standardSeconds(1))
+              .withNumStorageWriteApiStreams(2);
+    }
+
+    p.apply("Create Dummy Inputs", Create.of(dummyInputs))
+        .setIsBoundedInternal(PCollection.IsBounded.UNBOUNDED)
+        .apply("Add a dummy key", WithKeys.of(1))
+        .apply("Sequence Rows", ParDo.of(new SequenceRowsDoFn(5)))
+        .apply("Stream to BigQuery", write);
+
+    p.run().waitUntilFinish();
+
+    List<TableRow> response =
+        BQ_CLIENT.queryUnflattened(
+            String.format("SELECT * FROM [%s] ORDER BY number", tableSpec),
+            PROJECT,
+            true,
+            false,
+            bigQueryLocation);
+    System.err.println("FULL RESULT " + response);
+
+    // Verification
+    verifyTableSchemaUpdated(tableSpec, evolvedSchema);
+    List<VerificationInfo> verifications =
+        ImmutableList.of(
+            new 
AutoValue_StorageApiDataTriggeredSchemaUpdateIT_VerificationInfo("", 20),
+            new 
AutoValue_StorageApiDataTriggeredSchemaUpdateIT_VerificationInfo("req IS NULL", 
15),
+            new 
AutoValue_StorageApiDataTriggeredSchemaUpdateIT_VerificationInfo(
+                "new1 IS NOT NULL", 15),
+            new 
AutoValue_StorageApiDataTriggeredSchemaUpdateIT_VerificationInfo(
+                "new2 IS NOT NULL", 15),
+            new 
AutoValue_StorageApiDataTriggeredSchemaUpdateIT_VerificationInfo(
+                "nested.nested_field1 IS NOT NULL", 10),
+            new 
AutoValue_StorageApiDataTriggeredSchemaUpdateIT_VerificationInfo(
+                "nested.nested_field2 IS NOT NULL", 10),
+            new 
AutoValue_StorageApiDataTriggeredSchemaUpdateIT_VerificationInfo(
+                "nested.double_nested.double_nested_field1 IS NOT NULL", 5),
+            new 
AutoValue_StorageApiDataTriggeredSchemaUpdateIT_VerificationInfo(
+                "nested.repeated_nested.repeated_nested_field1 IS NOT NULL", 
5),
+            new 
AutoValue_StorageApiDataTriggeredSchemaUpdateIT_VerificationInfo(
+                "nested.repeated_nested.repeated_nested_field2 IS NOT NULL", 
5));
+    verifyDataWritten(tableSpec, verifications);
+  }
+
+  private void verifyTableSchemaUpdated(String tableSpec, TableSchema 
evolvedSchema)
+      throws IOException, InterruptedException {
+    Table table =
+        BQ_CLIENT.getTableResource(
+            PROJECT,
+            BIG_QUERY_DATASET_ID,
+            Iterables.getLast(
+                
org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Splitter.on('.')
+                    .split(tableSpec)));
+    assertEquals(
+        TableRowToStorageApiProto.schemaToProtoTableSchema(evolvedSchema),
+        TableRowToStorageApiProto.schemaToProtoTableSchema(table.getSchema()));
+  }

Review Comment:
   rough idea: BigQueryIO supports successful write propagation. We can add a 
ParDo lisrtening to these successful writes, and validate the schemas there. 
Again though order is not guaranteed. 
   
   I'm also noticing that the implementation of successful-write propagation 
appears broken for the EO sink. We push to this PCollection as soon as we 
write, but before we flush the stream.



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