Github user lazyman500 commented on a diff in the pull request:
https://github.com/apache/spark/pull/4417#discussion_r24299603
--- Diff: examples/src/main/python/boardcast.py ---
@@ -0,0 +1,55 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+
+import sys
+import time
+from operator import add
+
+from pyspark import SparkContext,SparkConf
+
+#Usage: BroadcastTest [slices] [numElem] [broadcastAlgo] [blockSize]
+
+if __name__ == "__main__":
+
+ slices = int(sys.argv[0]) if len(sys.argv) > 1 else 1
+ num = int(sys.argv[1]) if len(sys.argv) > 2 else 10000000
+ bcName = sys.argv[2] if len(sys.argv) > 3 else "Http"
+ blockSize = sys.argv[3] if len(sys.argv) > 4 else "4092"
+
+ conf = SparkConf().setAppName("Broadcast Test") \
+ .setMaster("local") \
+ .set("spark.broadcast.factory",
"org.apache.spark.broadcast.%sBroadcastFactory"%bcName) \
+ .set("spark.broadcast.blockSize", blockSize)
+
+
+
+ sc = SparkContext(conf=conf)
+ #simple broadcast
+ b = sc.broadcast([1, 2, 3])
+ result =sc.parallelize([0, 0]).flatMap(lambda x: b.value).collect()
+ for s in result:
+ print "value is %s:" % s
+ #large broadcast
+ for i in range(3):
+ print "Iteration %i" % i
+ start = time.time()
+ barr1 = sc.broadcast(range(num))
--- End diff --
I had added some comment to explain why we use broadcast variables . and
print the performance report.
--------------------------------------------------------------
Using broadcast: Iteration 0 cost time 0.829586982727
Using broadcast: Iteration 1 cost time 0.0809919834137
Using broadcast: Iteration 2 cost time 0.0794229507446
Don't use broadcast: Iteration 0 cost time 2.80766296387
Don't use broadcast: Iteration 1 cost time 2.83087706566
Don't use broadcast: Iteration 2 cost time 3.16146707535
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