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Published: Jul 9, 2020 License: Apache-2.0

README

Go SDK (experimental)

The Go SDK is currently an experimental feature of Apache Beam and not suitable for production use. It is based on the following initial design.

How to run the examples

Prerequisites: to use Google Cloud sources and sinks (default for most examples), follow the setup here. You can verify that it works by running the corresponding Java example.

The examples are normal Go programs and are most easily run directly. They are parameterized by Go flags. For example, to run wordcount on direct runner do:

$ pwd
[...]/sdks/go
$ go run examples/wordcount/wordcount.go --output=/tmp/result.txt
[{6: KV<string,int>/GW/KV<bytes,int[varintz]>}]
[{10: KV<int,string>/GW/KV<int[varintz],bytes>}]
2018/03/21 09:39:03 Pipeline:
2018/03/21 09:39:03 Nodes: {1: []uint8/GW/bytes}
{2: string/GW/bytes}
{3: string/GW/bytes}
{4: string/GW/bytes}
{5: string/GW/bytes}
{6: KV<string,int>/GW/KV<bytes,int[varintz]>}
{7: CoGBK<string,int>/GW/CoGBK<bytes,int[varintz]>}
{8: KV<string,int>/GW/KV<bytes,int[varintz]>}
{9: string/GW/bytes}
{10: KV<int,string>/GW/KV<int[varintz],bytes>}
{11: CoGBK<int,string>/GW/CoGBK<int[varintz],bytes>}
Edges: 1: Impulse [] -> [Out: []uint8 -> {1: []uint8/GW/bytes}]
2: ParDo [In(Main): []uint8 <- {1: []uint8/GW/bytes}] -> [Out: T -> {2: string/GW/bytes}]
3: ParDo [In(Main): string <- {2: string/GW/bytes}] -> [Out: string -> {3: string/GW/bytes}]
4: ParDo [In(Main): string <- {3: string/GW/bytes}] -> [Out: string -> {4: string/GW/bytes}]
5: ParDo [In(Main): string <- {4: string/GW/bytes}] -> [Out: string -> {5: string/GW/bytes}]
6: ParDo [In(Main): T <- {5: string/GW/bytes}] -> [Out: KV<T,int> -> {6: KV<string,int>/GW/KV<bytes,int[varintz]>}]
7: CoGBK [In(Main): KV<string,int> <- {6: KV<string,int>/GW/KV<bytes,int[varintz]>}] -> [Out: CoGBK<string,int> -> {7: CoGBK<string,int>/GW/CoGBK<bytes,int[varintz]>}]
8: Combine [In(Main): int <- {7: CoGBK<string,int>/GW/CoGBK<bytes,int[varintz]>}] -> [Out: KV<string,int> -> {8: KV<string,int>/GW/KV<bytes,int[varintz]>}]
9: ParDo [In(Main): KV<string,int> <- {8: KV<string,int>/GW/KV<bytes,int[varintz]>}] -> [Out: string -> {9: string/GW/bytes}]
10: ParDo [In(Main): T <- {9: string/GW/bytes}] -> [Out: KV<int,T> -> {10: KV<int,string>/GW/KV<int[varintz],bytes>}]
11: CoGBK [In(Main): KV<int,string> <- {10: KV<int,string>/GW/KV<int[varintz],bytes>}] -> [Out: CoGBK<int,string> -> {11: CoGBK<int,string>/GW/CoGBK<int[varintz],bytes>}]
12: ParDo [In(Main): CoGBK<int,string> <- {11: CoGBK<int,string>/GW/CoGBK<int[varintz],bytes>}] -> []
2018/03/21 09:39:03 Reading from gs://apache-beam-samples/shakespeare/kinglear.txt
2018/03/21 09:39:04 Writing to /tmp/result.txt

The debugging output is currently quite verbose and likely to change. The output is a local file in this case:

$ head /tmp/result.txt 
while: 2
darkling: 1
rail'd: 1
ford: 1
bleed's: 1
hath: 52
Remain: 1
disclaim: 1
sentence: 1
purse: 6

To run wordcount on dataflow runner do:

$  go run wordcount.go --runner=dataflow --project=<YOUR_GCP_PROJECT> --region=<YOUR_GCP_REGION> --staging_location=<YOUR_GCS_LOCATION>/staging --worker_harness_container_image=<YOUR_SDK_HARNESS_IMAGE_LOCATION> --output=<YOUR_GCS_LOCATION>/output

The output is a GCS file in this case:

$ gsutil cat <YOUR_GCS_LOCATION>/output* | head
Blanket: 1
blot: 1
Kneeling: 3
cautions: 1
appears: 4
Deserved: 1
nettles: 1
OSWALD: 53
sport: 3
Crown'd: 1

See BUILD.md for how to build Go code in general. See container documentation for how to build and push the Go SDK harness container image.

Issues

Please use the sdk-go component for any bugs or feature requests.

Contributing to the Go SDK

New to developing Go?

https://tour.golang.org : The Go Tour gives you the basics of the language, interactively no installation required.

https://github.com/campoy/go-tooling-workshop is a great start on learning good (optional) development tools for Go.

Developing Go Beam SDK on Github

To make and test changes when working with Go, it's neecessary to clone your repository in a subdirectory of your GOPATH. This permits existing gradle tools to use your in progress changes.

# Create a Go compatible place for the repo, using src/github.com/apache/
# matches where Go will look for the files, or go get would put them.
$ mkdir -p $GOPATH/src/github.com/apache/
$ cd $GOPATH/src/github.com/apache/


# Clone the repo, and update your branch as normal
$ git clone https://github.com/apache/beam.git
$ cd beam
$ git remote add <GitHub_user> git@github.com:<GitHub_user>/beam.git
$ git fetch --all

# Get or Update all the Go SDK dependencies
$ go get -u ./...
# Test that the system compiles and runs.
$ go test ./...

If you don’t have a GOPATH set, follow these instructions to create a new directory in your home directory, and use that.

Follow the contribution guide to create branches, and submit pull requests as normal.

Dependency management

Until BEAM-5379 is resolved, Beam locks versions of packages with the gogradle plugin. If new dependencies are added in a PR then the lock file needs to be updated. From the $GOPATH/src/github.com/apache/beam directory run

$ ./gradlew :sdks:go:goLock
`./gradlew :goPostcommit`

to update the lock file, and test your code under the locked versions. gogradle will add vendor directories with the locked versions of the code.

You can sanity check a PR on Jenkins by commenting Run Go PostCommit to trigger the integration tests. This is important so that the Beam testing done on the jenkins cluster can produce consistent results, and have the packages available.

Directories

Path Synopsis
cmd
beamctl
beamctl is a command line client for the Apache Beam portability services.
beamctl is a command line client for the Apache Beam portability services.
beamctl/cmd
Package cmd contains the commands for beamctl.
Package cmd contains the commands for beamctl.
specialize
specialize is a low-level tool to generate type-specialized code.
specialize is a low-level tool to generate type-specialized code.
starcgen
starcgen is a tool to generate specialized type assertion shims to be used in Apache Beam Go SDK pipelines instead of the default reflection shim.
starcgen is a tool to generate specialized type assertion shims to be used in Apache Beam Go SDK pipelines instead of the default reflection shim.
symtab
Package verifies that functions sym2addr and addr2sym work correctly.
Package verifies that functions sym2addr and addr2sym work correctly.
examples
cookbook/tornadoes
tornadoes is an example that reads the public samples of weather data from BigQuery, counts the number of tornadoes that occur in each month, and writes the results to BigQuery.
tornadoes is an example that reads the public samples of weather data from BigQuery, counts the number of tornadoes that occur in each month, and writes the results to BigQuery.
debugging_wordcount
debugging_wordcount is an example that verifies word counts in Shakespeare and includes Beam best practices.
debugging_wordcount is an example that verifies word counts in Shakespeare and includes Beam best practices.
forest
forest is an example that shows that pipeline construction is normal Go code -- the pipeline "forest" is created recursively and uses a global variable -- and that a pipeline may contain non-connected parts.
forest is an example that shows that pipeline construction is normal Go code -- the pipeline "forest" is created recursively and uses a global variable -- and that a pipeline may contain non-connected parts.
minimal_wordcount
minimal_wordcount is an example that counts words in Shakespeare.
minimal_wordcount is an example that counts words in Shakespeare.
multiout
multiout is a wordcount variation that uses a multi-outout DoFn and writes 2 output files.
multiout is a wordcount variation that uses a multi-outout DoFn and writes 2 output files.
readavro
readavro is a simple Avro read/write Example This example uses a 500 Byte sample avro file [twitter.avro] download here: https://s3-eu-west-1.amazonaws.com/daidokoro-dev/apache/twitter.avro
readavro is a simple Avro read/write Example This example uses a 500 Byte sample avro file [twitter.avro] download here: https://s3-eu-west-1.amazonaws.com/daidokoro-dev/apache/twitter.avro
streaming_wordcap
streaming_wordcap is a toy streaming pipeline that uses PubSub.
streaming_wordcap is a toy streaming pipeline that uses PubSub.
stringsplit
An example of using a Splittable DoFn in the Go SDK with a portable runner.
An example of using a Splittable DoFn in the Go SDK with a portable runner.
windowed_wordcount
windowed_wordcount counts words in text, and can run over either unbounded or bounded input collections.
windowed_wordcount counts words in text, and can run over either unbounded or bounded input collections.
wordcount
wordcount is an example that counts words in Shakespeare and includes Beam best practices.
wordcount is an example that counts words in Shakespeare and includes Beam best practices.
yatzy
yatzy is an implementation of https://en.wikipedia.org/wiki/Yatzy that shows that pipeline construction is normal Go code.
yatzy is an implementation of https://en.wikipedia.org/wiki/Yatzy that shows that pipeline construction is normal Go code.
pkg
beam
Package beam is an implementation of the Apache Beam (https://beam.apache.org) programming model in Go.
Package beam is an implementation of the Apache Beam (https://beam.apache.org) programming model in Go.
beam/artifact
Package artifact contains utilities for staging and retrieving artifacts.
Package artifact contains utilities for staging and retrieving artifacts.
beam/artifact/gcsproxy
Package gcsproxy contains artifact staging and retrieval servers backed by GCS.
Package gcsproxy contains artifact staging and retrieval servers backed by GCS.
beam/core/funcx
Package funcx contains functions and types used to perform type analysis of Beam functions.
Package funcx contains functions and types used to perform type analysis of Beam functions.
beam/core/graph
Package graph is the internal representation of the Beam execution plan.
Package graph is the internal representation of the Beam execution plan.
beam/core/graph/coder
Package coder contains coder representation and utilities.
Package coder contains coder representation and utilities.
beam/core/graph/mtime
Package mtime contains a millisecond representation of time.
Package mtime contains a millisecond representation of time.
beam/core/graph/window
Package window contains window representation, windowing strategies and utilities.
Package window contains window representation, windowing strategies and utilities.
beam/core/metrics
Package metrics implements the Beam metrics API, described at http://s.apache.org/beam-metrics-api Metrics in the Beam model are uniquely identified by a namespace, a name, and the PTransform context in which they are used.
Package metrics implements the Beam metrics API, described at http://s.apache.org/beam-metrics-api Metrics in the Beam model are uniquely identified by a namespace, a name, and the PTransform context in which they are used.
beam/core/runtime
Package runtime contains runtime hooks and utilities for pipeline options and type registration.
Package runtime contains runtime hooks and utilities for pipeline options and type registration.
beam/core/runtime/coderx
Package coderx contains coders for primitive types that aren't included in the beam model.
Package coderx contains coders for primitive types that aren't included in the beam model.
beam/core/runtime/exec
Package exec contains runtime plan representation and execution.
Package exec contains runtime plan representation and execution.
beam/core/runtime/exec/optimized
Package optimized contains type-specialized shims for faster execution.
Package optimized contains type-specialized shims for faster execution.
beam/core/runtime/graphx
Package graphx provides facilities to help with the serialization of pipelines into a serializable graph structure suitable for the worker.
Package graphx provides facilities to help with the serialization of pipelines into a serializable graph structure suitable for the worker.
beam/core/runtime/graphx/v1
Package v1 is a generated protocol buffer package.
Package v1 is a generated protocol buffer package.
beam/core/runtime/harness
Package harness implements the SDK side of the Beam FnAPI.
Package harness implements the SDK side of the Beam FnAPI.
beam/core/runtime/harness/init
Package init contains the harness initialization code defined by the FnAPI.
Package init contains the harness initialization code defined by the FnAPI.
beam/core/runtime/harness/session
Package session is a generated protocol buffer package.
Package session is a generated protocol buffer package.
beam/core/runtime/pipelinex
Package pipelinex contains utilities for manipulating Beam proto pipelines.
Package pipelinex contains utilities for manipulating Beam proto pipelines.
beam/core/sdf
Package contains interfaces used specifically for splittable DoFns.
Package contains interfaces used specifically for splittable DoFns.
beam/core/typex
Package typex contains full type representation for PCollections and DoFns, and utilities for type checking.
Package typex contains full type representation for PCollections and DoFns, and utilities for type checking.
beam/core/util/dot
Package dot produces DOT graphs from Beam graph representations.
Package dot produces DOT graphs from Beam graph representations.
beam/core/util/hooks
Package hooks allows runners to tailor execution of the worker harness.
Package hooks allows runners to tailor execution of the worker harness.
beam/core/util/ioutilx
Package ioutilx contains additional io utilities.
Package ioutilx contains additional io utilities.
beam/core/util/protox
Package protox contains utilities for working with protobufs.
Package protox contains utilities for working with protobufs.
beam/core/util/reflectx
Package reflectx contains a set of reflection utilities and well-known types.
Package reflectx contains a set of reflection utilities and well-known types.
beam/core/util/stringx
Package stringx contains utilities for working with strings.
Package stringx contains utilities for working with strings.
beam/core/util/symtab
Package symtab allows reading low-level symbol information from the symbol table.
Package symtab allows reading low-level symbol information from the symbol table.
beam/internal/errors
Package errors contains functionality for creating and wrapping errors with improved formatting compared to the standard Go error functionality.
Package errors contains functionality for creating and wrapping errors with improved formatting compared to the standard Go error functionality.
beam/io/avroio
Package avroio contains transforms for reading and writing avro files.
Package avroio contains transforms for reading and writing avro files.
beam/io/bigqueryio
Package bigqueryio provides transformations and utilities to interact with Google BigQuery.
Package bigqueryio provides transformations and utilities to interact with Google BigQuery.
beam/io/databaseio
Package databaseio provides transformations and utilities to interact with generic database database/sql API.
Package databaseio provides transformations and utilities to interact with generic database database/sql API.
beam/io/datastoreio
Package datastoreio provides transformations and utilities to interact with Google Datastore.
Package datastoreio provides transformations and utilities to interact with Google Datastore.
beam/io/filesystem
Package filesystem contains an extensible file system abstraction.
Package filesystem contains an extensible file system abstraction.
beam/io/filesystem/gcs
Package gcs contains a Google Cloud Storage (GCS) implementation of the Beam file system.
Package gcs contains a Google Cloud Storage (GCS) implementation of the Beam file system.
beam/io/filesystem/local
Package local contains a local file implementation of the Beam file system.
Package local contains a local file implementation of the Beam file system.
beam/io/filesystem/memfs
Package memfs contains a in-memory Beam filesystem.
Package memfs contains a in-memory Beam filesystem.
beam/io/pubsubio
Package pubsubio provides access to PubSub on Dataflow streaming.
Package pubsubio provides access to PubSub on Dataflow streaming.
beam/io/pubsubio/v1
Package v1 is a generated protocol buffer package.
Package v1 is a generated protocol buffer package.
beam/io/rtrackers/offsetrange
Package offsetrange defines a restriction and restriction tracker for offset ranges.
Package offsetrange defines a restriction and restriction tracker for offset ranges.
beam/io/synthetic
Package synthetic contains transforms for creating synthetic pipelines.
Package synthetic contains transforms for creating synthetic pipelines.
beam/io/textio
Package textio contains transforms for reading and writing text files.
Package textio contains transforms for reading and writing text files.
beam/log
Package log contains a re-targetable context-aware logging system.
Package log contains a re-targetable context-aware logging system.
beam/model
Package model contains the portable Beam model contracts.
Package model contains the portable Beam model contracts.
beam/options/gcpopts
Package gcpopts contains shared options for Google Cloud Platform.
Package gcpopts contains shared options for Google Cloud Platform.
beam/options/jobopts
Package jobopts contains shared options for job submission.
Package jobopts contains shared options for job submission.
beam/provision
Package provision contains utilities for obtaining runtime provision, information -- such as pipeline options.
Package provision contains utilities for obtaining runtime provision, information -- such as pipeline options.
beam/runners/dataflow
Package dataflow contains the Dataflow runner for submitting pipelines to Google Cloud Dataflow.
Package dataflow contains the Dataflow runner for submitting pipelines to Google Cloud Dataflow.
beam/runners/dataflow/dataflowlib
Package dataflowlib translates a Beam pipeline model to the Dataflow API job model, for submission to Google Cloud Dataflow.
Package dataflowlib translates a Beam pipeline model to the Dataflow API job model, for submission to Google Cloud Dataflow.
beam/runners/direct
Package direct contains the direct runner for running single-bundle pipelines in the current process.
Package direct contains the direct runner for running single-bundle pipelines in the current process.
beam/runners/dot
Package dot is a Beam runner that "runs" a pipeline by producing a DOT graph of the execution plan.
Package dot is a Beam runner that "runs" a pipeline by producing a DOT graph of the execution plan.
beam/runners/flink
Package flink contains the Flink runner.
Package flink contains the Flink runner.
beam/runners/spark
Package spark contains the Spark runner.
Package spark contains the Spark runner.
beam/runners/universal
Package universal contains a general-purpose runner that can submit jobs to any portable Beam runner.
Package universal contains a general-purpose runner that can submit jobs to any portable Beam runner.
beam/runners/universal/runnerlib
Package runnerlib contains utilities for submitting Go pipelines to a Beam model runner.
Package runnerlib contains utilities for submitting Go pipelines to a Beam model runner.
beam/runners/vet
Package vet is a Beam runner that "runs" a pipeline by producing generated code to avoid symbol table lookups and reflection in pipeline execution.
Package vet is a Beam runner that "runs" a pipeline by producing generated code to avoid symbol table lookups and reflection in pipeline execution.
beam/runners/vet/testpipeline
Package testpipeline exports small test pipelines for testing the vet runner.
Package testpipeline exports small test pipelines for testing the vet runner.
beam/testing/passert
Package passert contains verification transformations for testing pipelines.
Package passert contains verification transformations for testing pipelines.
beam/testing/ptest
Package ptest contains utilities for pipeline unit testing.
Package ptest contains utilities for pipeline unit testing.
beam/transforms/filter
Package filter contains transformations for removing pipeline elements based on various conditions.
Package filter contains transformations for removing pipeline elements based on various conditions.
beam/transforms/stats
Package stats contains transforms for statistical processing.
Package stats contains transforms for statistical processing.
beam/transforms/top
Package top contains transformations for finding the smallest (or largest) N elements based on arbitrary orderings.
Package top contains transformations for finding the smallest (or largest) N elements based on arbitrary orderings.
beam/util/errorx
Package errorx contains utilities for handling errors.
Package errorx contains utilities for handling errors.
beam/util/execx
Package execx contains wrappers and utilities for the exec package.
Package execx contains wrappers and utilities for the exec package.
beam/util/gcsx
Package gcsx contains utilities for working with Google Cloud Storage (GCS).
Package gcsx contains utilities for working with Google Cloud Storage (GCS).
beam/util/grpcx
Package grpcx contains utilities for working with gRPC.
Package grpcx contains utilities for working with gRPC.
beam/util/pubsubx
Package pubsubx contains utilities for working with Google PubSub.
Package pubsubx contains utilities for working with Google PubSub.
beam/util/shimx
Package shimx specifies the templates for generating type assertion shims for Apache Beam Go SDK pipelines.
Package shimx specifies the templates for generating type assertion shims for Apache Beam Go SDK pipelines.
beam/util/starcgenx
Package starcgenx is a Static Analysis Type Assertion shim and Registration Code Generator which provides an extractor to extract types from a package, in order to generate approprate shimsr a package so code can be generated for it.
Package starcgenx is a Static Analysis Type Assertion shim and Registration Code Generator which provides an extractor to extract types from a package, in order to generate approprate shimsr a package so code can be generated for it.
beam/util/syscallx
Package syscallx provides system call utilities that attempt to hide platform differences.
Package syscallx provides system call utilities that attempt to hide platform differences.
beam/x/beamx
Package beamx is a convenience package for beam.
Package beamx is a convenience package for beam.
beam/x/debug
Package debug contains pipeline components that may help in debugging pipeline issues.
Package debug contains pipeline components that may help in debugging pipeline issues.
beam/x/hooks/perf
Package perf is to add performance measuring hooks to a runner, such as cpu, heap, or trace profiles.
Package perf is to add performance measuring hooks to a runner, such as cpu, heap, or trace profiles.
test
integration
The integration driver provides a suite of tests to run against a registered runner.
The integration driver provides a suite of tests to run against a registered runner.
integration/synthetic
Package synthetic contains pipelines for testing synthetic steps and sources.
Package synthetic contains pipelines for testing synthetic steps and sources.
integration/wordcount
Package wordcount contains transforms for wordcount.
Package wordcount contains transforms for wordcount.
regression
Package regression contains pipeline regression tests.
Package regression contains pipeline regression tests.

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