Examples with DataStreamMapper com.google.cloud.teleport.v2.cdc.mappers.DataStreamMapper used on opensource projects

Example 1 with DataStreamMapper

use of com.google.cloud.teleport.v2.cdc.mappers.DataStreamMapper in project DataflowTemplates by GoogleCloudPlatform.

the class DataStreamToBigQuery method run.

/**
 * Runs the pipeline with the supplied options.
 *
 * @param options The execution parameters to the pipeline.
 * @return The result of the pipeline execution.
 */
public static PipelineResult run(Options options) {
    /*
     * Stages:
     *   1) Ingest and Normalize Data to FailsafeElement with JSON Strings
     *   2) Write JSON Strings to TableRow Collection
     *       - Optionally apply a UDF
     *   3) BigQuery Output of TableRow Data
     *     a) Map New Columns & Write to Staging Tables
     *     b) Map New Columns & Merge Staging to Target Table
     *   4) Write Failures to GCS Dead Letter Queue
     */
    Pipeline pipeline = Pipeline.create(options);
    DeadLetterQueueManager dlqManager = buildDlqManager(options);
    String bigqueryProjectId = getBigQueryProjectId(options);
    String dlqDirectory = dlqManager.getRetryDlqDirectoryWithDateTime();
    String tempDlqDir = dlqManager.getRetryDlqDirectory() + "tmp/";
    InputUDFToTableRow<String> failsafeTableRowTransformer = new InputUDFToTableRow<String>(options.getJavascriptTextTransformGcsPath(), options.getJavascriptTextTransformFunctionName(), options.getPythonTextTransformGcsPath(), options.getPythonTextTransformFunctionName(), options.getRuntimeRetries(), FAILSAFE_ELEMENT_CODER);
    /*
     * Stage 1: Ingest and Normalize Data to FailsafeElement with JSON Strings
     *   a) Read DataStream data from GCS into JSON String FailsafeElements (datastreamJsonRecords)
     *   b) Reconsume Dead Letter Queue data from GCS into JSON String FailsafeElements
     *     (dlqJsonRecords)
     *   c) Flatten DataStream and DLQ Streams (jsonRecords)
     */
    PCollection<FailsafeElement<String, String>> datastreamJsonRecords = pipeline.apply(new DataStreamIO(options.getStreamName(), options.getInputFilePattern(), options.getInputFileFormat(), options.getGcsPubSubSubscription(), options.getRfcStartDateTime()).withFileReadConcurrency(options.getFileReadConcurrency()));
    // Elements sent to the Dead Letter Queue are to be reconsumed.
    // A DLQManager is to be created using PipelineOptions, and it is in charge
    // of building pieces of the DLQ.
    PCollection<FailsafeElement<String, String>> dlqJsonRecords = pipeline.apply("DLQ Consumer/reader", dlqManager.dlqReconsumer(options.getDlqRetryMinutes())).apply("DLQ Consumer/cleaner", ParDo.of(new DoFn<String, FailsafeElement<String, String>>() {

        @ProcessElement
        public void process(@Element String input, OutputReceiver<FailsafeElement<String, String>> receiver) {
            receiver.output(FailsafeElement.of(input, input));
        }
    })).setCoder(FAILSAFE_ELEMENT_CODER);
    PCollection<FailsafeElement<String, String>> jsonRecords = PCollectionList.of(datastreamJsonRecords).and(dlqJsonRecords).apply("Merge Datastream & DLQ", Flatten.pCollections());
    /*
     * Stage 2: Write JSON Strings to TableRow PCollectionTuple
     *   a) Optionally apply a Javascript or Python UDF
     *   b) Convert JSON String FailsafeElements to TableRow's (tableRowRecords)
     */
    PCollectionTuple tableRowRecords = jsonRecords.apply("UDF to TableRow/udf", failsafeTableRowTransformer);
    PCollection<TableRow> shuffledTableRows = tableRowRecords.get(failsafeTableRowTransformer.transformOut).apply("UDF to TableRow/ReShuffle", Reshuffle.<TableRow>viaRandomKey().withNumBuckets(100));
    /*
     * Stage 3: BigQuery Output of TableRow Data
     *   a) Map New Columns & Write to Staging Tables (writeResult)
     *   b) Map New Columns & Merge Staging to Target Table (null)
     *
     *   failsafe: writeResult.getFailedInsertsWithErr()
     */
    // TODO(beam 2.23): InsertRetryPolicy should be CDC compliant
    Set<String> fieldsToIgnore = getFieldsToIgnore(options.getIgnoreFields());
    WriteResult writeResult = shuffledTableRows.apply("Map to Staging Tables", new DataStreamMapper(options.as(GcpOptions.class), options.getOutputProjectId(), options.getOutputStagingDatasetTemplate(), options.getOutputStagingTableNameTemplate()).withDataStreamRootUrl(options.getDataStreamRootUrl()).withDefaultSchema(BigQueryDefaultSchemas.DATASTREAM_METADATA_SCHEMA).withDayPartitioning(true).withIgnoreFields(fieldsToIgnore)).apply("Write Successful Records", BigQueryIO.<KV<TableId, TableRow>>write().to(new BigQueryDynamicConverters().bigQueryDynamicDestination()).withFormatFunction(element -> removeTableRowFields(element.getValue(), fieldsToIgnore)).withFormatRecordOnFailureFunction(element -> element.getValue()).withoutValidation().ignoreInsertIds().withCreateDisposition(CreateDisposition.CREATE_NEVER).withWriteDisposition(WriteDisposition.WRITE_APPEND).withExtendedErrorInfo().withMethod(BigQueryIO.Write.Method.STREAMING_INSERTS).withFailedInsertRetryPolicy(InsertRetryPolicy.retryTransientErrors()));
    if (options.getApplyMerge()) {
        shuffledTableRows.apply("Map To Replica Tables", new DataStreamMapper(options.as(GcpOptions.class), options.getOutputProjectId(), options.getOutputDatasetTemplate(), options.getOutputTableNameTemplate()).withDataStreamRootUrl(options.getDataStreamRootUrl()).withDefaultSchema(BigQueryDefaultSchemas.DATASTREAM_METADATA_SCHEMA).withIgnoreFields(fieldsToIgnore)).apply("BigQuery Merge/Build MergeInfo", new MergeInfoMapper(bigqueryProjectId, options.getOutputStagingDatasetTemplate(), options.getOutputStagingTableNameTemplate(), options.getOutputDatasetTemplate(), options.getOutputTableNameTemplate())).apply("BigQuery Merge/Merge into Replica Tables", BigQueryMerger.of(MergeConfiguration.bigQueryConfiguration().withMergeWindowDuration(Duration.standardMinutes(options.getMergeFrequencyMinutes()))));
    }
    /*
     * Stage 4: Write Failures to GCS Dead Letter Queue
     */
    PCollection<String> udfDlqJson = PCollectionList.of(tableRowRecords.get(failsafeTableRowTransformer.udfDeadletterOut)).and(tableRowRecords.get(failsafeTableRowTransformer.transformDeadletterOut)).apply("UDF Failures/Flatten", Flatten.pCollections()).apply("UDF Failures/Sanitize", MapElements.via(new StringDeadLetterQueueSanitizer()));
    PCollection<String> bqWriteDlqJson = writeResult.getFailedInsertsWithErr().apply("BigQuery Failures", MapElements.via(new BigQueryDeadLetterQueueSanitizer()));
    PCollectionList.of(udfDlqJson).and(bqWriteDlqJson).apply("Write To DLQ/Flatten", Flatten.pCollections()).apply("Write To DLQ/Writer", DLQWriteTransform.WriteDLQ.newBuilder().withDlqDirectory(dlqDirectory).withTmpDirectory(tempDlqDir).build());
    // Execute the pipeline and return the result.
    return pipeline.run();
}