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_r262055248
##########
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:
It deserves a comment, at least. I think this is a relatively safe change as
this is already how Python 3 works.
I can only find one usage in this file, which is the part that applies a UDF
to data. That's the source of the issue? just checking. Surprisingly that seems
to be the only call in non-test code where it seems to matter.
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