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https://issues.apache.org/jira/browse/SPARK-31788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17117253#comment-17117253
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Apache Spark commented on SPARK-31788:
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User 'HyukjinKwon' has created a pull request for this issue:
https://github.com/apache/spark/pull/28648
> Error when creating UnionRDD of PairRDDs
> ----------------------------------------
>
> Key: SPARK-31788
> URL: https://issues.apache.org/jira/browse/SPARK-31788
> Project: Spark
> Issue Type: Bug
> Components: DStreams, PySpark, Spark Core
> Affects Versions: 3.0.0
> Reporter: Sanket Reddy
> Assignee: Hyukjin Kwon
> Priority: Blocker
>
> Union RDD of Pair RDD's seems to have issues
> SparkSession available as 'spark'.
> {code}
> rdd1 = sc.parallelize([1,2,3,4,5])
> rdd2 = sc.parallelize([6,7,8,9,10])
> pairRDD1 = rdd1.zip(rdd2)
> unionRDD1 = sc.union([pairRDD1, pairRDD1])
> {code}
> {code}
> Traceback (most recent call last): File "<stdin>", line 1, in <module> File
> "/home/gs/spark/latest/python/pyspark/context.py", line 870,
> in union jrdds[i] = rdds[i]._jrdd
> File
> "/home/gs/spark/latest/python/lib/py4j-0.10.9-src.zip/py4j/java_collections.py",
> line 238, in _setitem_ File
> "/home/gs/spark/latest/python/lib/py4j-0.10.9-src.zip/py4j/java_collections.py",
> line 221,
> in __set_item File
> "/home/gs/spark/latest/python/lib/py4j-0.10.9-src.zip/py4j/protocol.py", line
> 332, in get_return_value py4j.protocol.Py4JError: An error occurred while
> calling None.None. Trace: py4j.Py4JException: Cannot convert
> org.apache.spark.api.java.JavaPairRDD to org.apache.spark.api.java.JavaRDD at
> py4j.commands.ArrayCommand.convertArgument(ArrayCommand.java:166) at
> py4j.commands.ArrayCommand.setArray(ArrayCommand.java:144) at
> py4j.commands.ArrayCommand.execute(ArrayCommand.java:97) at
> py4j.GatewayConnection.run(GatewayConnection.java:238) at
> java.lang.Thread.run(Thread.java:748)
> {code}
> {code}
> rdd3 = sc.parallelize([11,12,13,14,15])
> pairRDD2 = rdd3.zip(rdd3)
> unionRDD2 = sc.union([pairRDD1, pairRDD2])
> {code}
> {code}
> Traceback (most recent call last): File "<stdin>", line 1, in <module> File
> "/home/gs/spark/latest/python/pyspark/context.py", line 870, in union
> jrdds[i] = rdds[i]._jrdd File
> "/home/gs/spark/latest/python/lib/py4j-0.10.9-src.zip/py4j/java_collections.py",
> line 238, in _setitem_ File
> "/home/gs/spark/latest/python/lib/py4j-0.10.9-src.zip/py4j/java_collections.py",
> line 221, in __set_item File
> "/home/gs/spark/latest/python/lib/py4j-0.10.9-src.zip/py4j/protocol.py", line
> 332, in get_return_value py4j.protocol.Py4JError: An error occurred while
> calling None.None. Trace: py4j.Py4JException: Cannot convert
> org.apache.spark.api.java.JavaPairRDD to org.apache.spark.api.java.JavaRDD at
> py4j.commands.ArrayCommand.convertArgument(ArrayCommand.java:166) at
> py4j.commands.ArrayCommand.setArray(ArrayCommand.java:144) at
> py4j.commands.ArrayCommand.execute(ArrayCommand.java:97) at
> py4j.GatewayConnection.run(GatewayConnection.java:238) at
> java.lang.Thread.run(Thread.java:748)
> {code}
> 2.4.5 does not have this regression as below:
> {code}
> rdd4 = sc.parallelize(range(5))
> pairRDD3 = rdd4.zip(rdd4)
> unionRDD3 = sc.union([pairRDD1, pairRDD3])
> unionRDD3.collect()
> {code}
> {code}
> [(1, 6), (2, 7), (3, 8), (4, 9), (5, 10), (0, 0), (1, 1), (2, 2), (3, 3), (4,
> 4)]
> {code}
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