zero323 commented on a change in pull request #30985:
URL: https://github.com/apache/spark/pull/30985#discussion_r558566116



##########
File path: python/pyspark/worker.py
##########
@@ -500,7 +501,10 @@ def main(infile, outfile):
 
             except (resource.error, OSError, ValueError) as e:
                 # not all systems support resource limits, so warn instead of 
failing
-                print("WARN: Failed to set memory limit: {0}\n".format(e), 
file=sys.stderr)
+                warnings.warn(
+                    "Failed to set memory limit: {0}\n".format(e),
+                    ResourceWarning
+                )

Review comment:
       > Maybe you could get the file number via, for example, 
`inspect.getframeinfo(inspect.currentframe()).lineno` too.
   
   My concern is that it is CPython-specific solution (I looked into this 
before, when trying to find viable replacement for keyword capturing mechanism 
in `keyword_only`). Since the only other implementation we support is PyPy it 
is probably fine though.




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