Examples with JsonStreamWriter com.google.cloud.bigquery.storage.v1beta2.JsonStreamWriter used on opensource projects

Example 6 with JsonStreamWriter

use of com.google.cloud.bigquery.storage.v1beta2.JsonStreamWriter in project java-bigquerystorage by googleapis.

the class WriteToDefaultStream method writeToDefaultStream.

public static void writeToDefaultStream(String projectId, String datasetName, String tableName) throws DescriptorValidationException, InterruptedException, IOException {
    BigQuery bigquery = BigQueryOptions.getDefaultInstance().getService();
    Table table = bigquery.getTable(datasetName, tableName);
    TableName parentTable = TableName.of(projectId, datasetName, tableName);
    Schema schema = table.getDefinition().getSchema();
    TableSchema tableSchema = BqToBqStorageSchemaConverter.convertTableSchema(schema);
    // https://googleapis.dev/java/google-cloud-bigquerystorage/latest/com/google/cloud/bigquery/storage/v1/JsonStreamWriter.html
    try (JsonStreamWriter writer = JsonStreamWriter.newBuilder(parentTable.toString(), tableSchema).build()) {
        // much writes as possible. Creating a writer for just one write is an antipattern.
        for (int i = 0; i < 2; i++) {
            // Create a JSON object that is compatible with the table schema.
            JSONArray jsonArr = new JSONArray();
            for (int j = 0; j < 10; j++) {
                JSONObject record = new JSONObject();
                record.put("test_string", String.format("record %03d-%03d", i, j));
                jsonArr.put(record);
            }
            ApiFuture<AppendRowsResponse> future = writer.append(jsonArr);
            AppendRowsResponse response = future.get();
        }
        System.out.println("Appended records successfully.");
    } catch (ExecutionException e) {
        // If the wrapped exception is a StatusRuntimeException, check the state of the operation.
        // If the state is INTERNAL, CANCELLED, or ABORTED, you can retry. For more information, see:
        // https://grpc.github.io/grpc-java/javadoc/io/grpc/StatusRuntimeException.html
        System.out.println("Failed to append records. \n" + e.toString());
    }
}

Example 7 with JsonStreamWriter

use of com.google.cloud.bigquery.storage.v1beta2.JsonStreamWriter in project dataproc-templates by GoogleCloudPlatform.

the class PubSubToBQ method writeToBQ.

public static void writeToBQ(JavaDStream<SparkPubsubMessage> pubSubStream, String outputProjectID, String pubSubBQOutputDataset, String PubSubBQOutputTable, Integer batchSize) {
    pubSubStream.foreachRDD(new VoidFunction<JavaRDD<SparkPubsubMessage>>() {

        @Override
        public void call(JavaRDD<SparkPubsubMessage> sparkPubsubMessageJavaRDD) throws Exception {
            sparkPubsubMessageJavaRDD.foreachPartition(new VoidFunction<Iterator<SparkPubsubMessage>>() {

                @Override
                public void call(Iterator<SparkPubsubMessage> sparkPubsubMessageIterator) throws Exception {
                    BigQuery bigquery = BigQueryOptions.getDefaultInstance().getService();
                    Table table = bigquery.getTable(pubSubBQOutputDataset, PubSubBQOutputTable);
                    TableName parentTable = TableName.of(outputProjectID, pubSubBQOutputDataset, PubSubBQOutputTable);
                    Schema schema = table.getDefinition().getSchema();
                    JsonStreamWriter writer = JsonStreamWriter.newBuilder(parentTable.toString(), schema).build();
                    JSONArray jsonArr = new JSONArray();
                    while (sparkPubsubMessageIterator.hasNext()) {
                        SparkPubsubMessage message = sparkPubsubMessageIterator.next();
                        JSONObject record = new JSONObject(new String(message.getData()));
                        jsonArr.put(record);
                        if (jsonArr.length() == batchSize) {
                            ApiFuture<AppendRowsResponse> future = writer.append(jsonArr);
                            AppendRowsResponse response = future.get();
                            jsonArr = new JSONArray();
                        }
                    }
                    if (jsonArr.length() > 0) {
                        ApiFuture<AppendRowsResponse> future = writer.append(jsonArr);
                        AppendRowsResponse response = future.get();
                    }
                    writer.close();
                }
            });
        }
    });
}

Example 8 with JsonStreamWriter

use of com.google.cloud.bigquery.storage.v1beta2.JsonStreamWriter in project java-bigquerystorage by googleapis.

the class WritePendingStream method writePendingStream.

public static void writePendingStream(String projectId, String datasetName, String tableName) throws DescriptorValidationException, InterruptedException, IOException {
    try (BigQueryWriteClient client = BigQueryWriteClient.create()) {
        // Initialize a write stream for the specified table.
        // For more information on WriteStream.Type, see:
        // https://googleapis.dev/java/google-cloud-bigquerystorage/latest/com/google/cloud/bigquery/storage/v1/WriteStream.Type.html
        WriteStream stream = WriteStream.newBuilder().setType(WriteStream.Type.PENDING).build();
        TableName parentTable = TableName.of(projectId, datasetName, tableName);
        CreateWriteStreamRequest createWriteStreamRequest = CreateWriteStreamRequest.newBuilder().setParent(parentTable.toString()).setWriteStream(stream).build();
        WriteStream writeStream = client.createWriteStream(createWriteStreamRequest);
        // https://googleapis.dev/java/google-cloud-bigquerystorage/latest/com/google/cloud/bigquery/storage/v1beta2/JsonStreamWriter.html
        try (JsonStreamWriter writer = JsonStreamWriter.newBuilder(writeStream.getName(), writeStream.getTableSchema()).build()) {
            // Write two batches to the stream, each with 10 JSON records.
            for (int i = 0; i < 2; i++) {
                // Create a JSON object that is compatible with the table schema.
                JSONArray jsonArr = new JSONArray();
                for (int j = 0; j < 10; j++) {
                    JSONObject record = new JSONObject();
                    record.put("col1", String.format("batch-record %03d-%03d", i, j));
                    jsonArr.put(record);
                }
                ApiFuture<AppendRowsResponse> future = writer.append(jsonArr);
                AppendRowsResponse response = future.get();
            }
            FinalizeWriteStreamResponse finalizeResponse = client.finalizeWriteStream(writeStream.getName());
            System.out.println("Rows written: " + finalizeResponse.getRowCount());
        }
        // Commit the streams.
        BatchCommitWriteStreamsRequest commitRequest = BatchCommitWriteStreamsRequest.newBuilder().setParent(parentTable.toString()).addWriteStreams(writeStream.getName()).build();
        BatchCommitWriteStreamsResponse commitResponse = client.batchCommitWriteStreams(commitRequest);
        // If the response does not have a commit time, it means the commit operation failed.
        if (commitResponse.hasCommitTime() == false) {
            for (StorageError err : commitResponse.getStreamErrorsList()) {
                System.out.println(err.getErrorMessage());
            }
            throw new RuntimeException("Error committing the streams");
        }
        System.out.println("Appended and committed records successfully.");
    } catch (ExecutionException e) {
        // If the wrapped exception is a StatusRuntimeException, check the state of the operation.
        // If the state is INTERNAL, CANCELLED, or ABORTED, you can retry. For more information, see:
        // https://grpc.github.io/grpc-java/javadoc/io/grpc/StatusRuntimeException.html
        System.out.println(e);
    }
}

Example 9 with JsonStreamWriter

use of com.google.cloud.bigquery.storage.v1beta2.JsonStreamWriter in project java-bigquerystorage by googleapis.

the class AppendCompleteCallback method writeToDefaultStream.

// writeToDefaultStream: Writes records from the source file to the destination table.
public static void writeToDefaultStream(String projectId, String datasetName, String tableName, String dataFile) throws DescriptorValidationException, InterruptedException, IOException {
    BigQuery bigquery = BigQueryOptions.getDefaultInstance().getService();
    // Get the schema of the destination table and convert to the equivalent BigQueryStorage type.
    Table table = bigquery.getTable(datasetName, tableName);
    Schema schema = table.getDefinition().getSchema();
    TableSchema tableSchema = BqToBqStorageSchemaConverter.convertTableSchema(schema);
    // Use the JSON stream writer to send records in JSON format.
    TableName parentTable = TableName.of(projectId, datasetName, tableName);
    try (JsonStreamWriter writer = JsonStreamWriter.newBuilder(parentTable.toString(), tableSchema).build()) {
        // Read JSON data from the source file and send it to the Write API.
        BufferedReader reader = new BufferedReader(new FileReader(dataFile));
        String line = reader.readLine();
        while (line != null) {
            // As a best practice, send batches of records, instead of single records at a time.
            JSONArray jsonArr = new JSONArray();
            for (int i = 0; i < 100; i++) {
                JSONObject record = new JSONObject(line);
                jsonArr.put(record);
                line = reader.readLine();
                if (line == null) {
                    break;
                }
            }
            // batch
            ApiFuture<AppendRowsResponse> future = writer.append(jsonArr);
            // The append method is asynchronous. Rather than waiting for the method to complete,
            // which can hurt performance, register a completion callback and continue streaming.
            ApiFutures.addCallback(future, new AppendCompleteCallback(), MoreExecutors.directExecutor());
        }
    }
}

Example 10 with JsonStreamWriter

use of com.google.cloud.bigquery.storage.v1beta2.JsonStreamWriter in project java-bigquerystorage by googleapis.

the class WriteBufferedStream method writeBufferedStream.

public static void writeBufferedStream(String projectId, String datasetName, String tableName) throws DescriptorValidationException, InterruptedException, IOException {
    try (BigQueryWriteClient client = BigQueryWriteClient.create()) {
        // Initialize a write stream for the specified table.
        // For more information on WriteStream.Type, see:
        // https://googleapis.dev/java/google-cloud-bigquerystorage/latest/com/google/cloud/bigquery/storage/v1/WriteStream.Type.html
        WriteStream stream = WriteStream.newBuilder().setType(WriteStream.Type.BUFFERED).build();
        TableName parentTable = TableName.of(projectId, datasetName, tableName);
        CreateWriteStreamRequest createWriteStreamRequest = CreateWriteStreamRequest.newBuilder().setParent(parentTable.toString()).setWriteStream(stream).build();
        WriteStream writeStream = client.createWriteStream(createWriteStreamRequest);
        // https://googleapis.dev/java/google-cloud-bigquerystorage/latest/com/google/cloud/bigquery/storage/v1beta2/JsonStreamWriter.html
        try (JsonStreamWriter writer = JsonStreamWriter.newBuilder(writeStream.getName(), writeStream.getTableSchema()).build()) {
            // Write two batches to the stream, each with 10 JSON records.
            for (int i = 0; i < 2; i++) {
                JSONArray jsonArr = new JSONArray();
                for (int j = 0; j < 10; j++) {
                    // Create a JSON object that is compatible with the table schema.
                    JSONObject record = new JSONObject();
                    record.put("col1", String.format("buffered-record %03d", i));
                    jsonArr.put(record);
                }
                ApiFuture<AppendRowsResponse> future = writer.append(jsonArr);
                AppendRowsResponse response = future.get();
            }
            // Flush the buffer.
            FlushRowsRequest flushRowsRequest = FlushRowsRequest.newBuilder().setWriteStream(writeStream.getName()).setOffset(// Advance the cursor to the latest record.
            Int64Value.of(10 * 2 - 1)).build();
            FlushRowsResponse flushRowsResponse = client.flushRows(flushRowsRequest);
        // You can continue to write to the stream after flushing the buffer.
        }
        // Finalize the stream after use.
        FinalizeWriteStreamRequest finalizeWriteStreamRequest = FinalizeWriteStreamRequest.newBuilder().setName(writeStream.getName()).build();
        client.finalizeWriteStream(finalizeWriteStreamRequest);
        System.out.println("Appended and committed records successfully.");
    } catch (ExecutionException e) {
        // If the wrapped exception is a StatusRuntimeException, check the state of the operation.
        // If the state is INTERNAL, CANCELLED, or ABORTED, you can retry. For more information, see:
        // https://grpc.github.io/grpc-java/javadoc/io/grpc/StatusRuntimeException.html
        System.out.println(e);
    }
}