ContinueAsNew does not support specifying a new orchestration version

Summary

The continueAsNew() API does not expose a way to specify a new orchestration version for the restarted instance. The underlying protobuf field (CompleteOrchestrationAction.newVersion, field 4) has existed since the initial proto commit, but the Java SDK never populates it.

Problem

TaskOrchestrationContext.continueAsNew() only accepts (Object input, boolean preserveUnprocessedEvents). There is no parameter to pass a new version. In TaskOrchestrationExecutor, when building the CompleteOrchestrationAction, setNewVersion() is never called — the field is always left empty.

This prevents version migration scenarios for long-running/eternal orchestrations (e.g., monitoring loops that need to evolve their logic over time via continueAsNew with a new version).

What exists today

• Proto layer: CompleteOrchestrationAction.newVersion (field 4) is defined and supported by all backends (DurableTask.Core since 2014, DTS/Beskar, gRPC sidecar)
• Java API: continueAsNew(Object input) and continueAsNew(Object input, boolean preserveUnprocessedEvents) — no version parameter
• Java executor: CompleteOrchestrationAction.Builder never calls setNewVersion()

Proposed fix

Follow the pattern from the .NET SDK (microsoft/durabletask-dotnet#682):

1. Add a ContinueAsNewOptions class with newInput, preserveUnprocessedEvents, and newVersion properties
2. Add a continueAsNew(ContinueAsNewOptions options) overload to TaskOrchestrationContext
3. In TaskOrchestrationExecutor, when newVersion is non-null, call builder.setNewVersion(StringValue.of(newVersion)) on the CompleteOrchestrationAction

Related

• .NET SDK implementation: microsoft/durabletask-dotnet#682
• Azure Functions extension: Azure/azure-functions-durable-extension#3404
• Proto field: CompleteOrchestrationAction.newVersion (field 4) in orchestrator_service.proto

首先定位 TaskOrchestrationContext 和 TaskOrchestrationExecutor，然后检查现有的 continueAsNew 重载以及 CompleteOrchestrationAction 的构造。使用描述中链接的 .NET SDK issue 作为拟议 options 形状的参考。当 Java 调用方可以提供新版本，并且 executor 在保留当前行为的同时填充 CompleteOrchestrationAction.newVersion 时，即表示完成。