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"""
>>> from pyspark.context import SparkContext
>>> sc = SparkContext('local', 'test')
>>> b = sc.broadcast([1, 2, 3, 4, 5])
>>> b.value
[1, 2, 3, 4, 5]
>>> from pyspark.broadcast import _broadcastRegistry
>>> _broadcastRegistry[b.bid] = b
>>> from cPickle import dumps, loads
>>> loads(dumps(b)).value
[1, 2, 3, 4, 5]
>>> sc.parallelize([0, 0]).flatMap(lambda x: b.value).collect()
[1, 2, 3, 4, 5, 1, 2, 3, 4, 5]
>>> large_broadcast = sc.broadcast(list(range(10000)))
"""
# Holds broadcasted data received from Java, keyed by its id.
_broadcastRegistry = {}
def _from_id(bid):
from pyspark.broadcast import _broadcastRegistry
if bid not in _broadcastRegistry:
raise Exception("Broadcast variable '%s' not loaded!" % bid)
return _broadcastRegistry[bid]
class Broadcast(object):
def __init__(self, bid, value, java_broadcast=None, pickle_registry=None):
self.value = value
self.bid = bid
self._jbroadcast = java_broadcast
self._pickle_registry = pickle_registry
def __reduce__(self):
self._pickle_registry.add(self)
return (_from_id, (self.bid, ))
def _test():
import doctest
doctest.testmod()
if __name__ == "__main__":
_test()
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