joeyutong commented on code in PR #924:
URL: https://github.com/apache/flink-agents/pull/924#discussion_r3702355667


##########
python/flink_agents/runtime/flink_runner_context.py:
##########
@@ -56,6 +59,24 @@
 logger = logging.getLogger(__name__)
 
 
+def _error_type(error: BaseException) -> str:
+    return f"{error.__class__.__module__}.{error.__class__.__qualname__}"
+
+
+def _root_cause(error: BaseException) -> BaseException:
+    current = error
+    visited: set[int] = set()
+    while id(current) not in visited:
+        visited.add(id(current))
+        cause = current.__cause__
+        if cause is None and not current.__suppress_context__:
+            cause = current.__context__

Review Comment:
   Good catch. The previous test covered only explicit `__cause__`, so the 
Python-only implicit `__context__` branch remained unaligned. I removed that 
fallback: Python now follows only explicitly chained causes, matching Java 
`Throwable.getCause()`, and added a regression test confirming implicit context 
is not used.



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