rameshreddy-adutla opened a new pull request, #10559:
URL: https://github.com/apache/seatunnel/pull/10559

   ## Summary
   Closes #10540
   
   Adds comprehensive Javadoc to all key methods in `SeaTunnelTask`, the 
abstract base class for all Zeta engine task executions.
   
   ## Changes
   
   **Class-level documentation:**
   - Describes the full task state machine (`CREATED → INIT → WAITING_RESTORE → 
READY_START → STARTING → RUNNING → PREPARE_CLOSE → CLOSED`)
   - Explains checkpoint coordination model
   
   **Method-level Javadoc added to:**
   | Method | What's documented |
   |--------|------------------|
   | `init()` | Flow-to-lifecycle conversion, metrics wiring, `flowFutures` 
registration |
   | `stateProcess()` | Full state machine transitions with all cases |
   | `convertFlowToActionLifeCycle(Flow)` | Recursive DAG traversal and output 
wiring |
   | `ack(Barrier)` | Per-cycle ACK accumulation, prepareClose detection, 
checkpoint ACK to coordinator |
   | `addState(Barrier, ActionStateKey, List<byte[]>)` | Per-action checkpoint 
state buffering |
   | `close()` | Ordered teardown with error aggregation |
   | `triggerSchemaChangeBeforeCheckpoint()` | DDL-before-checkpoint barrier 
propagation |
   | `triggerSchemaChangeAfterCheckpoint()` | DDL-after-checkpoint barrier 
propagation |
   
   ## Testing
   Documentation-only change — no functional changes.


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