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[#24789] Mention prism is the new default Go SDK runner in CHANGES.md #27816

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Aug 2, 2023
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[#24789] Mention prism is the new default Go SDK runner in CHANGES.md #27816

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mention prism in changes.md
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12 changes: 11 additions & 1 deletion CHANGES.md
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Expand Up @@ -57,6 +57,7 @@
* New highly anticipated feature X added to Python SDK ([#X](https://github.com/apache/beam/issues/X)).
* New highly anticipated feature Y added to Java SDK ([#Y](https://github.com/apache/beam/issues/Y)).
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* Spark 3.2.2 is used as default version for Spark runner ([#23804](https://github.com/apache/beam/issues/23804)).
* The Go SDK has a new default local runner, called Prism ([#24789](https://github.com/apache/beam/issues/24789)).

## I/Os

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* X feature added (Java/Python) ([#X](https://github.com/apache/beam/issues/X)).
* The Go SDK now requires Go 1.20 to build. ([#27558](https://github.com/apache/beam/issues/27558))
* The Go SDK has a new default local runner, Prism. ([#24789](https://github.com/apache/beam/issues/24789)).
* Prism is a portable runner that executes each transform independantly, ensuring coders.
* At this point it supercedes the Go direct runner in functionality. The Go direct runner is now deprecated.
* See https://github.com/apache/beam/blob/master/sdks/go/pkg/beam/runners/prism/README.md for the goals and features of Prism.

## Breaking Changes

* Legacy runner support removed from Dataflow, all pipelines must use runner v2.
* Python SDK: Legacy runner support removed from Dataflow, all pipelines must use runner v2.
* The Go Direct Runner is now Deprecated. It remains available to reduce migration churn.
* Tests can be set back to the direct runner by overriding TestMain: `func TestMain(m *testing.M) { ptest.MainWithDefault(m, "direct") }`
* It's recommended to fix issues seen in tests using Prism, as they can also happen on any portable runner.
* Use the generic register package for your pipeline DoFns to ensure pipelines function on portable runners, like prism.
* Do not rely on closures or using package globals for DoFn configuration. They don't function on portable runners.

## Deprecations

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