[I] [Bug][UI] SeaTunnel workflow tasks cannot select stream execution type [dolphinscheduler]

["sunlishuo25 (via GitHub)" <gi...@apache.org>]

sunlishuo25 opened a new issue, #18672:
URL: https://github.com/apache/dolphinscheduler/issues/18672

   ### What happened
   
   A SeaTunnel task created in a workflow is always initialized as a DolphinScheduler `BATCH` task. Setting SeaTunnel's `env.job.mode = "STREAMING"` does not change this: after execution, the task belongs to the Batch Task instance list and cannot be explicitly classified as a Stream Task in the form.
   
   The form offers no execution-type selection for SeaTunnel. This also affects resource-file configurations, whose contents are not available to the form.
   
   ### Version and reproduction
   
   Confirmed in current `dev` at `c63ecc9bf68919547fe69b5266e4040b113028e8`; the same initialization path exists in 3.3.2.
   
   1. Create a workflow and add a SeaTunnel task.
   2. Set its SeaTunnel configuration to streaming mode, or select a streaming configuration resource.
   3. Save the node. The serialized definition has `taskExecuteType: "BATCH"`; there is no form control to choose `STREAM`.
   
   A local source-level reproduction executed the real SeaTunnel model, shared `useTask`, and `formatParams`: BATCH and STREAMING custom configurations both serialize as BATCH, as does a resource configuration. FLINK_STREAM is the control case and serializes as STREAM. Unrelated form widgets were mocked; this is not a claim of a live SeaTunnel engine test.
   
   ### Expected behavior / focused proposal
   
   Allow an explicit SeaTunnel Batch/Stream execution-type choice for workflow-managed tasks, defaulting to Batch for compatibility. Persist the existing taskExecuteType field and preserve it in the editor and DAG metadata. Do not parse arbitrary HOCON/resources in the browser or classify all SeaTunnel tasks as streams.
   
   This is limited to workflow-managed attached submission. It does not restore the removed standalone streaming runtime, add detached-job lifecycle tracking, or implement SeaTunnel savepoints. The existing savepoint action should be disabled for SeaTunnel because its task does not implement StreamTask.
   
   ### Related context
   
   The standalone Task Definition UI was removed in #16397 and the previous streaming executor was removed during #16327. This proposal uses the current workflow execution path instead. #17786 and #18492 concern engine cancellation and are separate from the creation/classification issue.
   
   Investigation and proposed implementation are AI-assisted.
   


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