shenshichao163-oss commented on issue #16789:
URL: 
https://github.com/apache/dolphinscheduler/issues/16789#issuecomment-5301521419

   I have submitted PR #18554 to fix this issue.
   
   ## Root Cause
   
   When stopping a Flink task from the page, DolphinScheduler uses the generic 
process kill logic (SIGINT/SIGTERM/SIGKILL), which does not properly cancel the 
Flink job. The `FlinkArgsUtils.buildCancelCommandLine()` method already exists 
in the codebase but was never called.
   
   ## Fix
   
   Override `cancelApplication()` in `FlinkTask` to:
   1. First attempt graceful cancellation using `flink cancel <appId>` command
   2. Fall back to process-level kill if the Flink cancel fails or times out
   
   Please review when you have time. Thanks!


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