Github user ueshin commented on a diff in the pull request:

    https://github.com/apache/spark/pull/20682#discussion_r171189077
  
    --- Diff: python/pyspark/ml/clustering.py ---
    @@ -1181,4 +1181,4 @@ def getKeepLastCheckpoint(self):
             except OSError:
                 pass
         if failure_count:
    -        exit(-1)
    +        sys.exit(-1)
    --- End diff --
    
    need to import sys.


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