srowen commented on a change in pull request #23954: [SPARK-27041][PySpark] Use 
imap() for python 2.x to resolve oom issue
URL: https://github.com/apache/spark/pull/23954#discussion_r262496122
 
 

 ##########
 File path: python/pyspark/worker.py
 ##########
 @@ -45,6 +45,8 @@
 
 if sys.version >= '3':
     basestring = str
+else:
+    from itertools import imap as map  # use iterator map by default
 
 Review comment:
   Hm, that's a good point. I don't know enough Python to be sure. @holdenk do 
you know how Python would work in this regard? Is it safer to push this check 
to the one site below and call one or the other map function? it looks like 
itertools doesn't have imap in Python 3.

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