[jira] [Created] (SPARK-25591) PySpark Accumulators with multiple PythonUDFs

["Abdeali Kothari (JIRA)" <ji...@apache.org>]

Abdeali Kothari created SPARK-25591:
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             Summary: PySpark Accumulators with multiple PythonUDFs
                 Key: SPARK-25591
                 URL: https://issues.apache.org/jira/browse/SPARK-25591
             Project: Spark
          Issue Type: Bug
          Components: PySpark
    Affects Versions: 2.3.2
            Reporter: Abdeali Kothari


When having multiple Python UDFs - the last Python UDF's accumulator is the only accumulator that gets updated.


{code:python}
import pyspark
from pyspark.sql import SparkSession, Row
from pyspark.sql import functions as F
from pyspark.sql import types as T

from pyspark import AccumulatorParam

spark = SparkSession.builder.getOrCreate()
spark.sparkContext.setLogLevel("ERROR")
test_accum = spark.sparkContext.accumulator(0.0)

SHUFFLE = False

def main(data):
    print(">>> Check0", test_accum.value)
    def test(x):
        global test_accum
        test_accum += 1.0
        return x

    print(">>> Check1", test_accum.value)

    def test2(x):
        global test_accum
        test_accum += 100.0
        return x

    print(">>> Check2", test_accum.value)
    func_udf = F.udf(test, T.DoubleType())
    print(">>> Check3", test_accum.value)
    func_udf2 = F.udf(test2, T.DoubleType())
    print(">>> Check4", test_accum.value)

    data = data.withColumn("out1", func_udf(data["a"]))
    if SHUFFLE:
        data = data.repartition(2)
    print(">>> Check5", test_accum.value)
    data = data.withColumn("out2", func_udf2(data["b"]))
    if SHUFFLE:
        data = data.repartition(2)
    print(">>> Check6", test_accum.value)

    data.show()  # ACTION
    print(">>> Check7", test_accum.value)
    return data


df = spark.createDataFrame([
    [1.0, 2.0]
], schema=T.StructType([T.StructField(field_name, T.DoubleType(), True) for field_name in ["a", "b"]]))

df2 = main(df)
{code}



######## Output 1 - with SHUFFLE=False
...
# >>> Check7 100.0


######## Output 2 - with SHUFFLE=True
...
# >>> Check7 101.0

Basically looks like:
 - Accumulator works only for last UDF before a shuffle-like operation



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