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NOTE: This library is sunsetting. Please consider using the official Google Cloud Java Client for Pub/Sub.

async-google-pubsub-client

Maven Central Build Status codecov.io

A performant Google Cloud Pub/Sub client and batch publisher.

What

A low level Pub/Sub client and a concurrent per-topic batching Publisher.

The client uses async-http-client with the Netty provider for making efficient and async HTTP requests to the Google Cloud Pub/Sub api.

The publisher is implemented on top of the async Pub/Sub client and concurrently gathers individual messages into per-topic batches which are then pushed to Google Cloud Pub/Sub at a specified desired request concurrency level in order to achieve both low-latency and high throughput.

Why

The official Google Cloud Pub/Sub client library was not performant enough for our purposes due to blocking I/O etc.

Usage

Pubsub Client

// Create a topic
pubsub.createTopic("my-google-cloud-project", "the-topic").get();

// Create a subscription
pubsub.createSubscription("my-google-cloud-project", "the-subscription-name", "the-topic").get();

// Create a batch of messages
final List<Message> messages = asList(
    Message.builder()
        .attributes("type", "foo")
        .data(encode("hello foo"))
        .build(),
    Message.builder()
        .attributes("type", "bar")
        .data(encode("hello foo"))
        .build());

// Publish the messages
final List<String> messageIds = pubsub.publish("my-google-cloud-project", "the-topic", messages).get();
System.out.println("Message IDs: " + messageIds);

// Pull the message
final List<ReceivedMessage> received = pubsub.pull("my-google-cloud-project", "the-subscription").get();
System.out.println("Received Messages: " + received);

// Ack the received messages
final List<String> ackIds = received.stream().map(ReceivedMessage::ackId).collect(Collectors.toList());
pubsub.acknowledge("my-google-cloud-project", "the-subscription", ackIds).get();

Publisher

final Pubsub pubsub = Pubsub.builder()
    .build();

final Publisher publisher = Publisher.builder()
    .pubsub(pubsub)
    .project("my-google-cloud-project")
    .concurrency(128)
    .build();

// A never ending stream of messages...
final Iterable<MessageAndTopic> messageStream = incomingMessages();

// Publish incoming messages
messageStream.forEach(m -> publisher.publish(m.topic, m.message));

Puller

final Pubsub pubsub = Pubsub.builder()
    .build();

final MessageHandler handler = (puller, subscription, message, ackId) -> {
  System.out.println("got message: " + message);
  return CompletableFuture.completedFuture(ackId);
};

final Puller puller = builder()
    .pubsub(pubsub)
    .project("my-google-cloud-project")
    .subscription("my-subscription")
    .concurrency(32)
    .messageHandler(handler)
    .build();

pom.xml

<dependency>
  <groupId>com.spotify</groupId>
  <artifactId>async-google-pubsub-client</artifactId>
  <version>1.31</version>
</dependency>

Publisher Benchmark

Note: This benchmark uses a lot of quota and network bandwidth.

$ mvn exec:exec -Dexec.executable="java" -Dexec.classpathScope="test" -Dexec.args="-cp %classpath com.spotify.google.cloud.pubsub.client.integration.PublisherBenchmark"
[INFO] Scanning for projects...
[INFO] Inspecting build with total of 1 modules...
[INFO] Installing Nexus Staging features:
[INFO]   ... total of 1 executions of maven-deploy-plugin replaced with nexus-staging-maven-plugin
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building async-google-pubsub-client 1.13-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- exec-maven-plugin:1.4.0:exec (default-cli) @ async-google-pubsub-client ---
2015-09-29 18:31:44 (1 s)
----------------------------------------------------------------------------------------------------------------
publishes         1,235 (    1,235 avg) messages/s      934.888 (     934.888 avg) ms latency        1,237 total

... warmup ...

2015-09-29 18:31:53 (10 s)
----------------------------------------------------------------------------------------------------------------
publishes       198,902 (  156,137 avg) messages/s      503.912 (     620.260 avg) ms latency    1,565,391 total

2015-09-29 18:31:54 (11 s)
----------------------------------------------------------------------------------------------------------------
publishes       212,755 (  177,264 avg) messages/s      475.023 (     602.638 avg) ms latency    1,778,331 total

...

End To End Benchmark

Note: This benchmark uses a lot of quota and network bandwidth.

$ mvn exec:exec -Dexec.executable="java" -Dexec.classpathScope="test" -Dexec.args="-cp %classpath com.spotify.google.cloud.pubsub.client.integration.EndToEndBenchmark"
[INFO] Scanning for projects...
[INFO] Inspecting build with total of 1 modules...
[INFO] Installing Nexus Staging features:
[INFO]   ... total of 1 executions of maven-deploy-plugin replaced with nexus-staging-maven-plugin
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building async-google-pubsub-client 1.13-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- exec-maven-plugin:1.4.0:exec (default-cli) @ async-google-pubsub-client ---
2015-09-29 18:29:12 (1 s)
----------------------------------------------------------------------------------------------------------------
publishes        15,230 (   15,230 avg) messages/s      650.532 (     650.532 avg) ms latency       15,224 total
 receives             0 (        0 avg) messages/s        0.000 (       0.000 avg) ms latency            0 total

... warmup ...

2015-09-29 18:29:27 (16 s)
----------------------------------------------------------------------------------------------------------------
publishes        85,455 (   79,706 avg) messages/s      588.480 (     659.066 avg) ms latency      980,385 total
 receives        78,382 (   81,186 avg) messages/s    1,112.738 (   1,319.294 avg) ms latency      939,036 total

2015-09-29 18:29:28 (17 s)
----------------------------------------------------------------------------------------------------------------
publishes       107,998 (   84,596 avg) messages/s      597.299 (     645.375 avg) ms latency    1,088,490 total
 receives       103,196 (   83,902 avg) messages/s    1,071.667 (   1,212.498 avg) ms latency    1,042,383 total
...

Pulling Benchmark

Note: This benchmark uses a lot of quota and network bandwidth.

Set the GOOGLE_PUBSUB_SUBSCRIPTION env var to the name of a subscription to consume from.

$ mvn exec:exec -Dexec.executable="java" -Dexec.classpathScope="test" -Dexec.args="-cp %classpath com.spotify.google.cloud.pubsub.client.integration.PullerBenchmark"

Releasing

We tag releases on github and publish release jars to maven central hosted by Sonatype: http://central.sonatype.org

Prerequisites

  1. Sonatype credentials for publishing to maven central. Apply for permission to publish jars on the com.spotify group id. See http://central.sonatype.org/pages/ossrh-guide.html.

  2. Add the sonatype credentials to ~/.m2/settings.xml

     <server>
   <id>ossrh</id>
   <username>YOUR_SONATYPE_USER</username>
   <password>YOUR_SONATYPE_PASS</password>
 </server>

  3. Set up GnuPG. See http://central.sonatype.org/pages/working-with-pgp-signatures.html. Make sure that you've distributed your public key to a key server.

Performing a Release

Have your GnuPG password ready. Both prepare and perform steps will ask you for it.

Note: The current tests run during both prepare and perform include integration tests against the real Google Pub/Sub API. Verify that you have a suitable default project and credentials configured with the gcloud cli.

  1. Tag and push a new release to github:

     mvn release:prepare

  2. Publish the signed jar to maven central:

     mvn release:perform

Todo

  • Implement a high level consumer (raw pull/ack support is there)
  • Implement retries on auth failure