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WritePendingStream.java
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WritePendingStream.java
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/*
* Copyright 2020 Google LLC
*
* Licensed 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 com.example.bigquerystorage;
// [START bigquerystorage_jsonstreamwriter_pending]
import com.google.api.core.ApiFuture;
import com.google.api.core.ApiFutureCallback;
import com.google.api.core.ApiFutures;
import com.google.api.gax.retrying.RetrySettings;
import com.google.cloud.bigquery.storage.v1.AppendRowsResponse;
import com.google.cloud.bigquery.storage.v1.BatchCommitWriteStreamsRequest;
import com.google.cloud.bigquery.storage.v1.BatchCommitWriteStreamsResponse;
import com.google.cloud.bigquery.storage.v1.BigQueryWriteClient;
import com.google.cloud.bigquery.storage.v1.CreateWriteStreamRequest;
import com.google.cloud.bigquery.storage.v1.Exceptions;
import com.google.cloud.bigquery.storage.v1.Exceptions.StorageException;
import com.google.cloud.bigquery.storage.v1.FinalizeWriteStreamResponse;
import com.google.cloud.bigquery.storage.v1.JsonStreamWriter;
import com.google.cloud.bigquery.storage.v1.StorageError;
import com.google.cloud.bigquery.storage.v1.TableName;
import com.google.cloud.bigquery.storage.v1.WriteStream;
import com.google.common.util.concurrent.MoreExecutors;
import com.google.protobuf.Descriptors.DescriptorValidationException;
import java.io.IOException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Phaser;
import javax.annotation.concurrent.GuardedBy;
import org.json.JSONArray;
import org.json.JSONObject;
import org.threeten.bp.Duration;
public class WritePendingStream {
public static void runWritePendingStream()
throws DescriptorValidationException, InterruptedException, IOException {
// TODO(developer): Replace these variables before running the sample.
String projectId = "MY_PROJECT_ID";
String datasetName = "MY_DATASET_NAME";
String tableName = "MY_TABLE_NAME";
writePendingStream(projectId, datasetName, tableName);
}
public static void writePendingStream(String projectId, String datasetName, String tableName)
throws DescriptorValidationException, InterruptedException, IOException {
BigQueryWriteClient client = BigQueryWriteClient.create();
TableName parentTable = TableName.of(projectId, datasetName, tableName);
DataWriter writer = new DataWriter();
// One time initialization.
writer.initialize(parentTable, client);
try {
// Write two batches of fake data to the stream, each with 10 JSON records. Data may be
// batched up to the maximum request size:
// https://cloud.google.com/bigquery/quotas#write-api-limits
long offset = 0;
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);
}
writer.append(jsonArr, offset);
offset += jsonArr.length();
}
} 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);
}
// Final cleanup for the stream.
writer.cleanup(client);
System.out.println("Appended records successfully.");
// Once all streams are done, if all writes were successful, commit all of them in one request.
// This example only has the one stream. If any streams failed, their workload may be
// retried on a new stream, and then only the successful stream should be included in the
// commit.
BatchCommitWriteStreamsRequest commitRequest =
BatchCommitWriteStreamsRequest.newBuilder()
.setParent(parentTable.toString())
.addWriteStreams(writer.getStreamName())
.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.");
}
// A simple wrapper object showing how the stateful stream writer should be used.
private static class DataWriter {
private JsonStreamWriter streamWriter;
// Track the number of in-flight requests to wait for all responses before shutting down.
private final Phaser inflightRequestCount = new Phaser(1);
private final Object lock = new Object();
@GuardedBy("lock")
private RuntimeException error = null;
void initialize(TableName parentTable, BigQueryWriteClient client)
throws IOException, DescriptorValidationException, InterruptedException {
// 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();
// Configure in-stream automatic retry settings.
// Error codes that are immediately retried:
// * ABORTED, UNAVAILABLE, CANCELLED, INTERNAL, DEADLINE_EXCEEDED
// Error codes that are retried with exponential backoff:
// * RESOURCE_EXHAUSTED
RetrySettings retrySettings =
RetrySettings.newBuilder()
.setInitialRetryDelay(Duration.ofMillis(500))
.setRetryDelayMultiplier(1.1)
.setMaxAttempts(5)
.setMaxRetryDelay(Duration.ofMinutes(1))
.build();
CreateWriteStreamRequest createWriteStreamRequest =
CreateWriteStreamRequest.newBuilder()
.setParent(parentTable.toString())
.setWriteStream(stream)
.build();
WriteStream writeStream = client.createWriteStream(createWriteStreamRequest);
// Use the JSON stream writer to send records in JSON format.
// For more information about JsonStreamWriter, see:
// https://googleapis.dev/java/google-cloud-bigquerystorage/latest/com/google/cloud/bigquery/storage/v1beta2/JsonStreamWriter.html
streamWriter =
JsonStreamWriter.newBuilder(writeStream.getName(), writeStream.getTableSchema())
.setRetrySettings(retrySettings)
.build();
}
public void append(JSONArray data, long offset)
throws DescriptorValidationException, IOException, ExecutionException {
synchronized (this.lock) {
// If earlier appends have failed, we need to reset before continuing.
if (this.error != null) {
throw this.error;
}
}
// Append asynchronously for increased throughput.
ApiFuture<AppendRowsResponse> future = streamWriter.append(data, offset);
ApiFutures.addCallback(
future, new AppendCompleteCallback(this), MoreExecutors.directExecutor());
// Increase the count of in-flight requests.
inflightRequestCount.register();
}
public void cleanup(BigQueryWriteClient client) {
// Wait for all in-flight requests to complete.
inflightRequestCount.arriveAndAwaitAdvance();
// Close the connection to the server.
streamWriter.close();
// Verify that no error occurred in the stream.
synchronized (this.lock) {
if (this.error != null) {
throw this.error;
}
}
// Finalize the stream.
FinalizeWriteStreamResponse finalizeResponse =
client.finalizeWriteStream(streamWriter.getStreamName());
System.out.println("Rows written: " + finalizeResponse.getRowCount());
}
public String getStreamName() {
return streamWriter.getStreamName();
}
static class AppendCompleteCallback implements ApiFutureCallback<AppendRowsResponse> {
private final DataWriter parent;
public AppendCompleteCallback(DataWriter parent) {
this.parent = parent;
}
public void onSuccess(AppendRowsResponse response) {
System.out.format("Append %d success\n", response.getAppendResult().getOffset().getValue());
done();
}
public void onFailure(Throwable throwable) {
synchronized (this.parent.lock) {
if (this.parent.error == null) {
StorageException storageException = Exceptions.toStorageException(throwable);
this.parent.error =
(storageException != null) ? storageException : new RuntimeException(throwable);
}
}
System.out.format("Error: %s\n", throwable.toString());
done();
}
private void done() {
// Reduce the count of in-flight requests.
this.parent.inflightRequestCount.arriveAndDeregister();
}
}
}
}
// [END bigquerystorage_jsonstreamwriter_pending]