DanielCarter-stack commented on issue #10442:
URL: https://github.com/apache/seatunnel/issues/10442#issuecomment-3841882179

   <!-- code-pr-reviewer -->
   Thank you for the detailed analysis and for offering to submit a PR! I've 
verified the issue.
   
   **Problem confirmed:** When `triggerCheckpoint()` throws an exception (e.g., 
Hazelcast `OperationTimeoutException` at `CheckpointCoordinator.java:684`), the 
exception is caught and logged at lines 687-689, but the code returns without 
decrementing `pendingCounter` (which was incremented at line 722). This causes 
`pendingCounter` to remain at 1, permanently blocking all subsequent checkpoint 
triggers at lines 564-568.
   
   **Affected files:**
   - 
`seatunnel-engine/seatunnel-engine-server/src/main/java/org/apache/seatunnel/engine/server/checkpoint/CheckpointCoordinator.java`
 (lines 683-690, 722, 564-568)
   
   **Suggested fix:** Ensure `pendingCounter.decrementAndGet()` is called in 
the exception handling path at line 688, or use try-finally to guarantee proper 
counter management. Adding a unit test for exception scenarios would also be 
valuable.
   
   Looking forward to your PR!


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