ahmedabu98 commented on code in PR #35599: URL: https://github.com/apache/beam/pull/35599#discussion_r2216927538
########## examples/java/src/main/java/org/apache/beam/examples/cookbook/IcebergRestCatalogStreamingWriteExample.java: ########## @@ -0,0 +1,202 @@ +/* + * 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.examples.cookbook; + +import com.google.auth.oauth2.GoogleCredentials; +import java.io.IOException; +import java.util.Map; +import org.apache.beam.sdk.Pipeline; +import org.apache.beam.sdk.coders.RowCoder; +import org.apache.beam.sdk.extensions.gcp.options.GcpOptions; +import org.apache.beam.sdk.io.gcp.pubsub.PubsubIO; +import org.apache.beam.sdk.managed.Managed; +import org.apache.beam.sdk.options.Default; +import org.apache.beam.sdk.options.Description; +import org.apache.beam.sdk.options.PipelineOptionsFactory; +import org.apache.beam.sdk.options.Validation; +import org.apache.beam.sdk.schemas.Schema; +import org.apache.beam.sdk.transforms.DoFn; +import org.apache.beam.sdk.transforms.Filter; +import org.apache.beam.sdk.transforms.JsonToRow; +import org.apache.beam.sdk.transforms.MapElements; +import org.apache.beam.sdk.transforms.ParDo; +import org.apache.beam.sdk.transforms.Sum; +import org.apache.beam.sdk.transforms.windowing.FixedWindows; +import org.apache.beam.sdk.transforms.windowing.Window; +import org.apache.beam.sdk.util.Preconditions; +import org.apache.beam.sdk.values.KV; +import org.apache.beam.sdk.values.PCollection; +import org.apache.beam.sdk.values.Row; +import org.apache.beam.sdk.values.TypeDescriptors; +import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableMap; +import org.joda.time.DateTime; +import org.joda.time.Duration; + +/** + * Reads real-time NYC taxi ride information from {@code + * projects/pubsub-public-data/topics/taxirides-realtime} and writes aggregated passenger count data + * to an Iceberg table using Beam's {@link Managed} IcebergIO sink. + * + * <p>This is a streaming pipeline that processes taxi ride events, filters for 'dropoff' status, + * aggregates passenger counts within fixed 10-second windows by minute of the ride, and writes the + * results to a single Iceberg table. The Iceberg sink triggers writes every 30 seconds, creating + * new snapshots. + * + * <p>This example is a demonstration of the Iceberg REST Catalog. For more information, see the + * documentation at {@link https://cloud.google.com/bigquery/docs/blms-rest-catalog}. + */ +public class IcebergRestCatalogStreamingWriteExample { + + public static final Schema TAXIRIDES_SCHEMA = + Schema.builder() + .addInt64Field("passenger_count") + .addStringField("ride_status") + .addDateTimeField("timestamp") + .build(); + + public static final Schema AGGREGATED_SCHEMA = + Schema.builder().addStringField("ride_minute").addInt64Field("passenger_count").build(); + + /** + * Main entry point for the pipeline. + * + * @param args Command line arguments + * @throws IOException if there's an issue with GoogleCredentials + */ + public static void main(String[] args) throws IOException { + IcebergPipelineOptions options = + PipelineOptionsFactory.fromArgs(args).withValidation().as(IcebergPipelineOptions.class); + options.setProject("apache-beam-testing"); + + final String tableIdentifier = "taxi_dataset.passenger_count_by_minute"; + final String pubsubTopic = options.getTopic(); + final String catalogUri = options.getCatalogUri(); + final String warehouseLocation = options.getWarehouse(); + final String projectName = options.getProject(); + final String catalogName = options.getCatalogName(); + final int triggeringFrequencySeconds = 30; + + // Note: The token expires in 1 hour, and users may need to re-run the pipeline. + // Upcoming changes in Iceberg and the BigLake Metastore with the Iceberg REST Catalog + // will support token refreshing and credential vending. + Map<String, String> catalogProps = + ImmutableMap.<String, String>builder() + .put("type", "rest") + .put("uri", catalogUri) + .put("warehouse", warehouseLocation) + .put("header.x-goog-user-project", projectName) + .put("oauth2-server-uri", "https://oauth2.googleapis.com/token";) + .put( + "token", + GoogleCredentials.getApplicationDefault().refreshAccessToken().getTokenValue()) + .put("rest-metrics-reporting-enabled", "false") + .build(); + + Map<String, Object> icebergWriteConfig = + ImmutableMap.<String, Object>builder() + .put("table", tableIdentifier) + .put("catalog_properties", catalogProps) + .put("catalog_name", catalogName) + .put("triggering_frequency_seconds", triggeringFrequencySeconds) + .build(); + + Pipeline p = Pipeline.create(options); + + PCollection<Row> aggregatedRows = + p.apply("ReadFromPubSub", PubsubIO.readStrings().fromTopic(pubsubTopic)) + .apply("ConvertJsonToRow", JsonToRow.withSchema(TAXIRIDES_SCHEMA)) + .apply( + "FilterNullFields", + Filter.by( + (Row row) -> + row.getInt64("passenger_count") != null + && row.getDateTime("timestamp") != null)) + .apply( + "FilterDropoffRides", + Filter.by((Row row) -> "dropoff".equals(row.getString("ride_status")))) + .apply( + "ApplyFixedWindow", Window.<Row>into(FixedWindows.of(Duration.standardSeconds(10)))) + .apply( + "ExtractMinuteAndPassengerCount", + MapElements.into( + TypeDescriptors.kvs(TypeDescriptors.strings(), TypeDescriptors.longs())) + .via( + (Row row) -> { + Long passengerCount = row.getInt64("passenger_count"); + DateTime timestamp = + (DateTime) + Preconditions.checkStateNotNull(row.getDateTime("timestamp")); + String minute = timestamp.toString("yyyy-MM-dd HH:mm"); + return KV.of(minute, passengerCount); + })) Review Comment: nit: can we shorten this logic? i.e. `row -> KV.of(checkStateNotNull(row.getDateTime("timestamp")).toString("..."), row.getInt64())` -- This is an automated message from the Apache Git Service. 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