ueshin commented on code in PR #53016:
URL: https://github.com/apache/spark/pull/53016#discussion_r2535657022


##########
python/pyspark/util.py:
##########
@@ -917,6 +918,67 @@ def default_api_mode() -> str:
         return "classic"
 
 
+class _FaulthandlerHelper:
+    def __init__(self) -> None:
+        self._log_path: Optional[str] = None
+        self._log_file: Optional[TextIO] = None
+        self._periodic_dump = False
+
+    def start(self) -> None:
+        if self._log_path:
+            raise Exception("Fault handler is already registered. No second 
registration allowed")
+        self._log_path = os.environ.get("PYTHON_FAULTHANDLER_DIR", None)
+        traceback_dump_interval_seconds = os.environ.get(
+            "PYTHON_TRACEBACK_DUMP_INTERVAL_SECONDS", None
+        )
+        if self._log_path:
+            self._log_path = os.path.join(self._log_path, str(os.getpid()))
+            self._log_file = open(self._log_path, "w")
+
+            faulthandler.enable(file=self._log_file)
+
+            if (
+                traceback_dump_interval_seconds is not None
+                and int(traceback_dump_interval_seconds) > 0
+            ):
+                self._periodic_dump = True
+                
faulthandler.dump_traceback_later(int(traceback_dump_interval_seconds), 
repeat=True)

Review Comment:
   In the daemon mode, the worker will wait at `split_index = read_int(infile) 
@ worker` or `check_python_version(infile) @ the others`, so this will be 
almost always enabled and it unnecessarily dump the traceback while just 
waiting for the next execution.
   
   Can we delay setting this to the current place, or block the daemon not to 
let the worker go into `main` until the next execution starts?
   



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