Github user mateiz commented on a diff in the pull request:
https://github.com/apache/spark/pull/1978#discussion_r16689375
--- Diff: python/pyspark/shuffle.py ---
@@ -434,6 +437,63 @@ def _recursive_merged_items(self, start):
os.remove(os.path.join(path, str(i)))
+class ExternalSorter(object):
+ """
+ ExtenalSorter will divide the elements into chunks, sort them in
+ memory and dump them into disks, finally merge them back.
+
+ The spilling will only happen when the used memory goes above
+ the limit.
+ """
+ def __init__(self, memory_limit, serializer=None):
+ self.memory_limit = memory_limit
+ self.local_dirs = _get_local_dirs("sort")
+ self.serializer = serializer or
BatchedSerializer(PickleSerializer(), 1024)
+
+ def _get_path(self, n):
--- End diff --
Yeah good question. We don't have that yet, but in the future we'll have
support for multiple local storage levels.
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