Google Cloud BigQuery Storage

The BigQuery Storage API offers fast access to BigQuery-managed storage using an rpc-based protocol. It is seen as an improvement over the REST API, and bulk data extract jobs for accessing BigQuery-managed table data, but doesn’t offer any functionality around managing BigQuery resources. Further information at the official Google Cloud documentation website.

This connector communicates to the BigQuery Storage API via the gRPC protocol. The integration between Akka Stream and gRPC is handled by the Akka gRPC library. Currently, this connector only supports returning each row as an Avro GenericRecord.

Project Info: Alpakka Google Cloud BigQuery Storage
Artifact	com.lightbend.akka akka-stream-alpakka-google-cloud-bigquery-storage 9.0.0 Snapshots are available
JDK versions	Eclipse Temurin JDK 11 Eclipse Temurin JDK 17
Scala versions	2.13.12
JPMS module name	akka.stream.alpakka.google.cloud.bigquery.storage
License	BUSL-1.1
Readiness level	Community-driven Since 3.0.4, 2021-11-12
Home page	https://doc.akka.io/libraries/alpakka/current
Forums	Lightbend Discuss
Release notes	GitHub releases
Issues	Github issues
Sources	https://github.com/akka/alpakka

Artifacts

The Akka dependencies are available from Akka’s library repository. To access them there, you need to configure the URL for this repository.

sbt

resolvers += "Akka library repository".at("https://repo.akka.io/maven")

Maven

<project>
  ...
  <repositories>
    <repository>
      <id>akka-repository</id>
      <name>Akka library repository</name>
      <url>https://repo.akka.io/maven</url>
    </repository>
  </repositories>
</project>

Gradle

repositories {
    mavenCentral()
    maven {
        url "https://repo.akka.io/maven"
    }
}

Additionally, add the dependencies as below. Since Akka gRPC uses Akka Discovery internally. Make sure to add Akka Discovery with the same Akka version that the application uses.

sbt

val AkkaVersion = "2.10.0"
libraryDependencies ++= Seq(
  "com.lightbend.akka" %% "akka-stream-alpakka-google-cloud-bigquery-storage" % "9.0.0",
  "com.typesafe.akka" %% "akka-stream" % AkkaVersion,
  "com.typesafe.akka" %% "akka-discovery" % AkkaVersion
)

Maven

<properties>
  <akka.version>2.10.0</akka.version>
  <scala.binary.version>2.13</scala.binary.version>
</properties>
<dependencies>
  <dependency>
    <groupId>com.lightbend.akka</groupId>
    <artifactId>akka-stream-alpakka-google-cloud-bigquery-storage_${scala.binary.version}</artifactId>
    <version>9.0.0</version>
  </dependency>
  <dependency>
    <groupId>com.typesafe.akka</groupId>
    <artifactId>akka-stream_${scala.binary.version}</artifactId>
    <version>${akka.version}</version>
  </dependency>
  <dependency>
    <groupId>com.typesafe.akka</groupId>
    <artifactId>akka-discovery_${scala.binary.version}</artifactId>
    <version>${akka.version}</version>
  </dependency>
</dependencies>

Gradle

def versions = [
  AkkaVersion: "2.10.0",
  ScalaBinary: "2.13"
]
dependencies {
  implementation "com.lightbend.akka:akka-stream-alpakka-google-cloud-bigquery-storage_${versions.ScalaBinary}:9.0.0"
  implementation "com.typesafe.akka:akka-stream_${versions.ScalaBinary}:${versions.AkkaVersion}"
  implementation "com.typesafe.akka:akka-discovery_${versions.ScalaBinary}:${versions.AkkaVersion}"
}

The table below shows direct dependencies of this module and the second tab shows all libraries it depends on transitively.

Direct dependencies

Organization	Artifact	Version
com.google.protobuf	protobuf-java	3.25.5
com.lightbend.akka.grpc	akka-grpc-runtime_2.13	2.5.0-M1
com.lightbend.akka	akka-stream-alpakka-google-common_2.13	9.0.0
com.thesamet.scalapb	scalapb-runtime_2.13	0.11.17
com.typesafe.akka	akka-discovery_2.13	2.10.0
com.typesafe.akka	akka-http-spray-json_2.13	10.7.0
com.typesafe.akka	akka-stream_2.13	2.10.0
io.grpc	grpc-auth	1.63.2
io.grpc	grpc-stub	1.63.2
org.scala-lang	scala-library	2.13.12

Dependency tree

com.google.protobuf    protobuf-java    3.25.5
com.lightbend.akka.grpc    akka-grpc-runtime_2.13    2.5.0-M1    BUSL-1.1
    com.google.protobuf    protobuf-java    3.25.5
    com.thesamet.scalapb    scalapb-runtime_2.13    0.11.17    Apache 2
        com.google.protobuf    protobuf-java    3.25.5
        com.thesamet.scalapb    lenses_2.13    0.11.17    Apache 2
            org.scala-lang.modules    scala-collection-compat_2.13    2.12.0    Apache-2.0
                org.scala-lang    scala-library    2.13.12    Apache-2.0
            org.scala-lang    scala-library    2.13.12    Apache-2.0
        org.scala-lang.modules    scala-collection-compat_2.13    2.12.0    Apache-2.0
            org.scala-lang    scala-library    2.13.12    Apache-2.0
        org.scala-lang    scala-library    2.13.12    Apache-2.0
    com.typesafe.akka    akka-discovery_2.13    2.10.0    BUSL-1.1
        com.typesafe.akka    akka-actor_2.13    2.10.0    BUSL-1.1
            com.typesafe    config    1.4.3    Apache-2.0
            org.scala-lang    scala-library    2.13.12    Apache-2.0
        org.scala-lang    scala-library    2.13.12    Apache-2.0
    com.typesafe.akka    akka-http-core_2.13    10.7.0    BUSL-1.1
        com.typesafe.akka    akka-parsing_2.13    10.7.0    BUSL-1.1
            org.scala-lang    scala-library    2.13.12    Apache-2.0
        org.scala-lang    scala-library    2.13.12    Apache-2.0
    com.typesafe.akka    akka-http_2.13    10.7.0    BUSL-1.1
        com.typesafe.akka    akka-http-core_2.13    10.7.0    BUSL-1.1
            com.typesafe.akka    akka-parsing_2.13    10.7.0    BUSL-1.1
                org.scala-lang    scala-library    2.13.12    Apache-2.0
            org.scala-lang    scala-library    2.13.12    Apache-2.0
        com.typesafe.akka    akka-pki_2.13    2.10.0    BUSL-1.1
            com.hierynomus    asn-one    0.6.0    The Apache License, Version 2.0
            com.typesafe.akka    akka-actor_2.13    2.10.0    BUSL-1.1
                com.typesafe    config    1.4.3    Apache-2.0
                org.scala-lang    scala-library    2.13.12    Apache-2.0
            org.scala-lang    scala-library    2.13.12    Apache-2.0
            org.slf4j    slf4j-api    2.0.16
        org.scala-lang    scala-library    2.13.12    Apache-2.0
    com.typesafe.akka    akka-pki_2.13    2.10.0    BUSL-1.1
        com.hierynomus    asn-one    0.6.0    The Apache License, Version 2.0
        com.typesafe.akka    akka-actor_2.13    2.10.0    BUSL-1.1
            com.typesafe    config    1.4.3    Apache-2.0
            org.scala-lang    scala-library    2.13.12    Apache-2.0
        org.scala-lang    scala-library    2.13.12    Apache-2.0
        org.slf4j    slf4j-api    2.0.16
    com.typesafe.akka    akka-stream_2.13    2.10.0    BUSL-1.1
        com.typesafe.akka    akka-actor_2.13    2.10.0    BUSL-1.1
            com.typesafe    config    1.4.3    Apache-2.0
            org.scala-lang    scala-library    2.13.12    Apache-2.0
        com.typesafe.akka    akka-protobuf-v3_2.13    2.10.0    BUSL-1.1
        org.reactivestreams    reactive-streams    1.0.4    MIT-0
        org.scala-lang    scala-library    2.13.12    Apache-2.0
    io.grpc    grpc-core    1.63.2    Apache 2.0
        com.google.android    annotations    4.1.1.4    Apache 2.0
        com.google.code.gson    gson    2.10.1    Apache-2.0
        com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
        com.google.guava    guava    32.1.3-android
            com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
            com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
            com.google.guava    failureaccess    1.0.1
            com.google.guava    listenablefuture    9999.0-empty-to-avoid-conflict-with-guava
            com.google.j2objc    j2objc-annotations    2.8    Apache License, Version 2.0
            org.checkerframework    checker-qual    3.37.0    The MIT License
        io.grpc    grpc-api    1.63.2    Apache 2.0
            com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
            com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
            com.google.guava    guava    32.1.3-android
                com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
                com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
                com.google.guava    failureaccess    1.0.1
                com.google.guava    listenablefuture    9999.0-empty-to-avoid-conflict-with-guava
                com.google.j2objc    j2objc-annotations    2.8    Apache License, Version 2.0
                org.checkerframework    checker-qual    3.37.0    The MIT License
        io.grpc    grpc-context    1.63.2    Apache 2.0
            io.grpc    grpc-api    1.63.2    Apache 2.0
                com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
                com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
                com.google.guava    guava    32.1.3-android
                    com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
                    com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
                    com.google.guava    failureaccess    1.0.1
                    com.google.guava    listenablefuture    9999.0-empty-to-avoid-conflict-with-guava
                    com.google.j2objc    j2objc-annotations    2.8    Apache License, Version 2.0
                    org.checkerframework    checker-qual    3.37.0    The MIT License
        io.perfmark    perfmark-api    0.26.0    Apache 2.0
        org.codehaus.mojo    animal-sniffer-annotations    1.23
    io.grpc    grpc-netty-shaded    1.63.2    Apache 2.0
        com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
        com.google.guava    guava    32.1.3-android
            com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
            com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
            com.google.guava    failureaccess    1.0.1
            com.google.guava    listenablefuture    9999.0-empty-to-avoid-conflict-with-guava
            com.google.j2objc    j2objc-annotations    2.8    Apache License, Version 2.0
            org.checkerframework    checker-qual    3.37.0    The MIT License
        io.grpc    grpc-api    1.63.2    Apache 2.0
            com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
            com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
            com.google.guava    guava    32.1.3-android
                com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
                com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
                com.google.guava    failureaccess    1.0.1
                com.google.guava    listenablefuture    9999.0-empty-to-avoid-conflict-with-guava
                com.google.j2objc    j2objc-annotations    2.8    Apache License, Version 2.0
                org.checkerframework    checker-qual    3.37.0    The MIT License
        io.grpc    grpc-core    1.63.2    Apache 2.0
            com.google.android    annotations    4.1.1.4    Apache 2.0
            com.google.code.gson    gson    2.10.1    Apache-2.0
            com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
            com.google.guava    guava    32.1.3-android
                com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
                com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
                com.google.guava    failureaccess    1.0.1
                com.google.guava    listenablefuture    9999.0-empty-to-avoid-conflict-with-guava
                com.google.j2objc    j2objc-annotations    2.8    Apache License, Version 2.0
                org.checkerframework    checker-qual    3.37.0    The MIT License
            io.grpc    grpc-api    1.63.2    Apache 2.0
                com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
                com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
                com.google.guava    guava    32.1.3-android
                    com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
                    com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
                    com.google.guava    failureaccess    1.0.1
                    com.google.guava    listenablefuture    9999.0-empty-to-avoid-conflict-with-guava
                    com.google.j2objc    j2objc-annotations    2.8    Apache License, Version 2.0
                    org.checkerframework    checker-qual    3.37.0    The MIT License
            io.grpc    grpc-context    1.63.2    Apache 2.0
                io.grpc    grpc-api    1.63.2    Apache 2.0
                    com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
                    com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
                    com.google.guava    guava    32.1.3-android
                        com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
                        com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
                        com.google.guava    failureaccess    1.0.1
                        com.google.guava    listenablefuture    9999.0-empty-to-avoid-conflict-with-guava
                        com.google.j2objc    j2objc-annotations    2.8    Apache License, Version 2.0
                        org.checkerframework    checker-qual    3.37.0    The MIT License
            io.perfmark    perfmark-api    0.26.0    Apache 2.0
            org.codehaus.mojo    animal-sniffer-annotations    1.23
        io.grpc    grpc-util    1.63.2    Apache 2.0
            com.google.guava    guava    32.1.3-android
                com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
                com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
                com.google.guava    failureaccess    1.0.1
                com.google.guava    listenablefuture    9999.0-empty-to-avoid-conflict-with-guava
                com.google.j2objc    j2objc-annotations    2.8    Apache License, Version 2.0
                org.checkerframework    checker-qual    3.37.0    The MIT License
            io.grpc    grpc-api    1.63.2    Apache 2.0
                com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
                com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
                com.google.guava    guava    32.1.3-android
                    com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
                    com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
                    com.google.guava    failureaccess    1.0.1
                    com.google.guava    listenablefuture    9999.0-empty-to-avoid-conflict-with-guava
                    com.google.j2objc    j2objc-annotations    2.8    Apache License, Version 2.0
                    org.checkerframework    checker-qual    3.37.0    The MIT License
            io.grpc    grpc-core    1.63.2    Apache 2.0
                com.google.android    annotations    4.1.1.4    Apache 2.0
                com.google.code.gson    gson    2.10.1    Apache-2.0
                com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
                com.google.guava    guava    32.1.3-android
                    com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
                    com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
                    com.google.guava    failureaccess    1.0.1
                    com.google.guava    listenablefuture    9999.0-empty-to-avoid-conflict-with-guava
                    com.google.j2objc    j2objc-annotations    2.8    Apache License, Version 2.0
                    org.checkerframework    checker-qual    3.37.0    The MIT License
                io.grpc    grpc-api    1.63.2    Apache 2.0
                    com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
                    com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
                    com.google.guava    guava    32.1.3-android
                        com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
                        com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
                        com.google.guava    failureaccess    1.0.1
                        com.google.guava    listenablefuture    9999.0-empty-to-avoid-conflict-with-guava
                        com.google.j2objc    j2objc-annotations    2.8    Apache License, Version 2.0
                        org.checkerframework    checker-qual    3.37.0    The MIT License
                io.grpc    grpc-context    1.63.2    Apache 2.0
                    io.grpc    grpc-api    1.63.2    Apache 2.0
                        com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
                        com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
                        com.google.guava    guava    32.1.3-android
                            com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
                            com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
                            com.google.guava    failureaccess    1.0.1
                            com.google.guava    listenablefuture    9999.0-empty-to-avoid-conflict-with-guava
                            com.google.j2objc    j2objc-annotations    2.8    Apache License, Version 2.0
                            org.checkerframework    checker-qual    3.37.0    The MIT License
                io.perfmark    perfmark-api    0.26.0    Apache 2.0
                org.codehaus.mojo    animal-sniffer-annotations    1.23
            org.codehaus.mojo    animal-sniffer-annotations    1.23
        io.perfmark    perfmark-api    0.26.0    Apache 2.0
    io.grpc    grpc-protobuf    1.63.2    Apache 2.0
        com.google.api.grpc    proto-google-common-protos    2.29.0    Apache-2.0
            com.google.protobuf    protobuf-java    3.25.5
        com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
        com.google.guava    guava    32.1.3-android
            com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
            com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
            com.google.guava    failureaccess    1.0.1
            com.google.guava    listenablefuture    9999.0-empty-to-avoid-conflict-with-guava
            com.google.j2objc    j2objc-annotations    2.8    Apache License, Version 2.0
            org.checkerframework    checker-qual    3.37.0    The MIT License
        com.google.protobuf    protobuf-java    3.25.5
        io.grpc    grpc-api    1.63.2    Apache 2.0
            com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
            com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
            com.google.guava    guava    32.1.3-android
                com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
                com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
                com.google.guava    failureaccess    1.0.1
                com.google.guava    listenablefuture    9999.0-empty-to-avoid-conflict-with-guava
                com.google.j2objc    j2objc-annotations    2.8    Apache License, Version 2.0
                org.checkerframework    checker-qual    3.37.0    The MIT License
        io.grpc    grpc-protobuf-lite    1.63.2    Apache 2.0
            com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
            com.google.guava    guava    32.1.3-android
                com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
                com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
                com.google.guava    failureaccess    1.0.1
                com.google.guava    listenablefuture    9999.0-empty-to-avoid-conflict-with-guava
                com.google.j2objc    j2objc-annotations    2.8    Apache License, Version 2.0
                org.checkerframework    checker-qual    3.37.0    The MIT License
            io.grpc    grpc-api    1.63.2    Apache 2.0
                com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
                com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
                com.google.guava    guava    32.1.3-android
                    com.google.code.findbugs    jsr305    3.0.2    The Apache Software License, Version 2.0
                    com.google.errorprone    error_prone_annotations    2.23.0    Apache 2.0
                    com.google.guava    failureaccess    1.0.1
                    com.google.guava    listenablefuture    9999.0-empty-to-avoid-conflict-with-guava
                    com.google.j2objc    j2objc-annotations    2.8    Apache License, Version 2.0
                    org.checkerframework    checker-qual    3.37.0    The MIT License
    org.scala-lang    scala-library    2.13.12    Apache-2.0
com.lightbend.akka    akka-stream-alpakka-google-common_2.13    9.0.0
    com.github.jwt-scala    jwt-json-common_2.13    9.4.6    Apache-2.0
        com.github.jwt-scala    jwt-core_2.13    9.4.6    Apache-2.0
            org.scala-lang    scala-library    2.13.12    Apache-2.0
        org.scala-lang    scala-library    2.13.12    Apache-2.0
    com.google.auth    google-auth-library-credentials    1.24.1
    com.typesafe.akka    akka-http-spray-json_2.13    10.7.0    BUSL-1.1
        com.typesafe.akka    akka-http_2.13    10.7.0    BUSL-1.1
            com.typesafe.akka    akka-http-core_2.13    10.7.0    BUSL-1.1
                com.typesafe.akka    akka-parsing_2.13    10.7.0    BUSL-1.1
                    org.scala-lang    scala-library    2.13.12    Apache-2.0
                org.scala-lang    scala-library    2.13.12    Apache-2.0
            com.typesafe.akka    akka-pki_2.13    2.10.0    BUSL-1.1
                com.hierynomus    asn-one    0.6.0    The Apache License, Version 2.0
                com.typesafe.akka    akka-actor_2.13    2.10.0    BUSL-1.1
                    com.typesafe    config    1.4.3    Apache-2.0
                    org.scala-lang    scala-library    2.13.12    Apache-2.0
                org.scala-lang    scala-library    2.13.12    Apache-2.0
                org.slf4j    slf4j-api    2.0.16
            org.scala-lang    scala-library    2.13.12    Apache-2.0
        io.spray    spray-json_2.13    1.3.6    Apache 2
            org.scala-lang    scala-library    2.13.12    Apache-2.0
        org.scala-lang    scala-library    2.13.12    Apache-2.0
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Build setup

The Alpakka Google Cloud BigQuery Storage library contains the classes generated from Google’s protobuf specification.

Java 17

When running on Java 17 and newer you have to add JVM flag --add-opens=java.base/java.nio=ALL-UNNAMED.

Configuration

The BigQuery Storage connector shares its basic configuration with all the Google connectors in Alpakka.

Example Test Configuration

alpakka.google.cloud.bigquery.grpc {
  host = "localhost"
  port = 21000
  rootCa = "none"
  callCredentials = "none"
}

For more configuration details consider the underlying configuration for Akka gRPC.

A manually initialized akka.stream.alpakka.googlecloud.bigquery.storage.scaladsl.GrpcBigQueryStorageReaderakka.stream.alpakka.googlecloud.bigquery.storage.javadsl.GrpcBigQueryStorageReader can be used by providing it as an attribute to the stream:

Scala

sourceval reader: GrpcBigQueryStorageReader = GrpcBigQueryStorageReader(BigQueryStorageSettings("localhost", 8000))
val sourceForReader: Source[(ReadSession.Schema, Seq[Source[ReadRowsResponse.Rows, NotUsed]]), Future[NotUsed]] =
  BigQueryStorage
    .create("projectId", "datasetId", "tableId", DataFormat.AVRO)
    .withAttributes(
      BigQueryStorageAttributes.reader(reader)
    )

Java

sourceGrpcBigQueryStorageReader reader =
    GrpcBigQueryStorageReader.apply(BigQueryStorageSettings.apply("localhost", 8000), sys);

Source<
        Tuple2<
            com.google.cloud.bigquery.storage.v1.stream.ReadSession.Schema,
            List<Source<ReadRowsResponse.Rows, NotUsed>>>,
        CompletionStage<NotUsed>>
    sourceForReader =
        BigQueryStorage.create(
                "projectId", "datasetId", "tableId", DataFormat.AVRO, readOptions, 1)
            .withAttributes(BigQueryStorageAttributes.reader(reader));

Reading

We can read in a number of ways. To read data from a table a read session needs to be created. On the session creation we can specify the number of streams to be used in order to transfer the data, this makes it feasible to achieve parallelism while ingesting the data, thus achieving better performance. To create a session the data format needs to be specified. The options provided are Avro and Arrow.

If no TableReadOptions are specified all the table’s columns shall be retrieved as a Source containing a Source for each stream, which will each deliver a section of the rows:

Scala

sourceimport akka.NotUsed
import com.google.cloud.bigquery.storage.v1.storage.ReadRowsResponse
import com.google.cloud.bigquery.storage.v1.DataFormat
import com.google.cloud.bigquery.storage.v1.stream.ReadSession
import akka.stream.alpakka.googlecloud.bigquery.storage.scaladsl.BigQueryStorage
import akka.stream.scaladsl.Source
import com.google.cloud.bigquery.storage.v1.stream.ReadSession.TableReadOptions
import scala.concurrent.Future

val sourceOfSources: Source[(ReadSession.Schema, Seq[Source[ReadRowsResponse.Rows, NotUsed]]), Future[NotUsed]] =
  BigQueryStorage.create("projectId", "datasetId", "tableId", DataFormat.AVRO)

Java

sourceimport akka.stream.alpakka.googlecloud.bigquery.storage.BigQueryRecord;
import akka.stream.alpakka.googlecloud.bigquery.storage.BigQueryStorageSettings;
import akka.stream.alpakka.googlecloud.bigquery.storage.javadsl.BigQueryArrowStorage;
import akka.stream.alpakka.googlecloud.bigquery.storage.javadsl.BigQueryAvroStorage;
import akka.stream.alpakka.googlecloud.bigquery.storage.javadsl.BigQueryStorage;
import akka.stream.alpakka.googlecloud.bigquery.storage.scaladsl.BigQueryStorageAttributes;
import akka.stream.alpakka.googlecloud.bigquery.storage.scaladsl.GrpcBigQueryStorageReader;
import akka.stream.javadsl.Source;
import akka.util.ByteString;
import scala.Tuple2;
import com.google.cloud.bigquery.storage.v1.DataFormat;
import com.google.cloud.bigquery.storage.v1.ReadSession;
import com.google.cloud.bigquery.storage.v1.storage.ReadRowsResponse;
import akka.http.javadsl.unmarshalling.Unmarshaller;

Source<
        Tuple2<
            com.google.cloud.bigquery.storage.v1.stream.ReadSession.Schema,
            List<Source<ReadRowsResponse.Rows, NotUsed>>>,
        CompletionStage<NotUsed>>
    sourceOfSources =
        BigQueryStorage.create("projectId", "datasetId", "tableId", DataFormat.AVRO);

Secondly, by specifying TableReadOptions, we can narrow down the amount of data returned, filtering down the columns returned, and/or a row_restriction. This is defined as:

SQL text filtering statement, similar to a WHERE clause in a query. Currently, only a single predicate that is a comparison between a column and a constant value is supported. Aggregates are not supported.

Scala

sourceval readOptions = TableReadOptions(selectedFields = Seq("stringField", "intField"), rowRestriction = "intField >= 5")
val sourceOfSourcesFiltered
    : Source[(ReadSession.Schema, Seq[Source[ReadRowsResponse.Rows, NotUsed]]), Future[NotUsed]] =
  BigQueryStorage.create("projectId", "datasetId", "tableId", DataFormat.AVRO, Some(readOptions))

Java

sourceReadSession.TableReadOptions readOptions =
    ReadSession.TableReadOptions.newBuilder()
        .setSelectedFields(0, "stringField")
        .setSelectedFields(1, "intField")
        .setRowRestriction("intField >= 5")
        .build();

Source<
        Tuple2<
            com.google.cloud.bigquery.storage.v1.stream.ReadSession.Schema,
            List<Source<ReadRowsResponse.Rows, NotUsed>>>,
        CompletionStage<NotUsed>>
    sourceOfSourcesFiltered =
        BigQueryStorage.create(
            "projectId", "datasetId", "tableId", DataFormat.AVRO, readOptions, 1);

You can then choose to read and process these streams as is or merged. You can process the streams merged in rows. You need to provide a ByteString Unmarshaller based on the format requested.

Scala

sourceimplicit val unmarshaller: FromByteStringUnmarshaller[List[BigQueryRecord]] =
  mock(classOf[FromByteStringUnmarshaller[List[BigQueryRecord]]])
val sequentialSource: Source[List[BigQueryRecord], Future[NotUsed]] =
  BigQueryStorage.createMergedStreams("projectId", "datasetId", "tableId", DataFormat.AVRO)

Java

sourceUnmarshaller<ByteString, List<BigQueryRecord>> unmarshaller = null;
Source<List<BigQueryRecord>, CompletionStage<NotUsed>> sequentialSource =
    BigQueryStorage.<List<BigQueryRecord>>createMergedStreams(
        "projectId", "datasetId", "tableId", DataFormat.AVRO, unmarshaller);

Or process the stream of rows individually:

Scala

sourceimport akka.NotUsed
import com.google.cloud.bigquery.storage.v1.storage.ReadRowsResponse
import com.google.cloud.bigquery.storage.v1.DataFormat
import com.google.cloud.bigquery.storage.v1.stream.ReadSession
import akka.stream.alpakka.googlecloud.bigquery.storage.scaladsl.BigQueryStorage
import akka.stream.scaladsl.Source
import com.google.cloud.bigquery.storage.v1.stream.ReadSession.TableReadOptions
import scala.concurrent.Future

val sourceOfSources: Source[(ReadSession.Schema, Seq[Source[ReadRowsResponse.Rows, NotUsed]]), Future[NotUsed]] =
  BigQueryStorage.create("projectId", "datasetId", "tableId", DataFormat.AVRO)

Java

sourceimport akka.stream.alpakka.googlecloud.bigquery.storage.BigQueryRecord;
import akka.stream.alpakka.googlecloud.bigquery.storage.BigQueryStorageSettings;
import akka.stream.alpakka.googlecloud.bigquery.storage.javadsl.BigQueryArrowStorage;
import akka.stream.alpakka.googlecloud.bigquery.storage.javadsl.BigQueryAvroStorage;
import akka.stream.alpakka.googlecloud.bigquery.storage.javadsl.BigQueryStorage;
import akka.stream.alpakka.googlecloud.bigquery.storage.scaladsl.BigQueryStorageAttributes;
import akka.stream.alpakka.googlecloud.bigquery.storage.scaladsl.GrpcBigQueryStorageReader;
import akka.stream.javadsl.Source;
import akka.util.ByteString;
import scala.Tuple2;
import com.google.cloud.bigquery.storage.v1.DataFormat;
import com.google.cloud.bigquery.storage.v1.ReadSession;
import com.google.cloud.bigquery.storage.v1.storage.ReadRowsResponse;
import akka.http.javadsl.unmarshalling.Unmarshaller;

Source<
        Tuple2<
            com.google.cloud.bigquery.storage.v1.stream.ReadSession.Schema,
            List<Source<ReadRowsResponse.Rows, NotUsed>>>,
        CompletionStage<NotUsed>>
    sourceOfSources =
        BigQueryStorage.create("projectId", "datasetId", "tableId", DataFormat.AVRO);

Since Avro and Arrow are the formats available, streams for those specific formats can be created.

You can read Arrow Record streams merged

Scala

sourceval arrowSequentialSource: Source[Seq[BigQueryRecord], Future[NotUsed]] =
  BigQueryArrowStorage.readRecordsMerged("projectId", "datasetId", "tableId")

Java

sourceSource<List<BigQueryRecord>, CompletionStage<NotUsed>> arrowSequentialSource =
    BigQueryArrowStorage.readRecordsMerged("projectId", "datasetId", "tableId");

You can read Arrow Record streams individually

Scala

sourceval arrowParallelSource: Source[Seq[Source[BigQueryRecord, NotUsed]], Future[NotUsed]] =
  BigQueryArrowStorage.readRecords("projectId", "datasetId", "tableId")

Java

sourceSource<List<Source<BigQueryRecord, NotUsed>>, CompletionStage<NotUsed>> arrowParallelSource =
    BigQueryArrowStorage.readRecords("projectId", "datasetId", "tableId");

You can read Avro Record streams merged

Scala

sourceval avroSequentialSource: Source[Seq[BigQueryRecord], Future[NotUsed]] =
  BigQueryAvroStorage.readRecordsMerged("projectId", "datasetId", "tableId")

Java

sourceSource<List<BigQueryRecord>, CompletionStage<NotUsed>> avroSequentialSource =
    BigQueryAvroStorage.readRecordsMerged("projectId", "datasetId", "tableId");

You can read Avro Record streams individually

Scala

sourceval avroParallelSource: Source[Seq[Source[BigQueryRecord, NotUsed]], Future[NotUsed]] =
  BigQueryAvroStorage.readRecords("projectId", "datasetId", "tableId")

Java

sourceSource<List<Source<BigQueryRecord, NotUsed>>, CompletionStage<NotUsed>> avroParallelSource =
    BigQueryAvroStorage.readRecords("projectId", "datasetId", "tableId");

Running the test code

The tests use a BigQueryMockServer that implements the server defined in the protobuf for the Storage API. It essentially provides a mock table on which to query. Tests can be started from sbt by running:

sbt

> google-cloud-bigquery-storage/test