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https://issues.apache.org/jira/browse/SPARK-32275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17166132#comment-17166132
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Hyukjin Kwon commented on SPARK-32275:
--------------------------------------
Looks like it tries to access to JVM instances within UDFs which are disallowed.
> "None.org.apache.spark.api.java.JavaSparkContext" Issue With Spark-Mllib
> Algorithm and JDBC Connectors
> ------------------------------------------------------------------------------------------------------
>
> Key: SPARK-32275
> URL: https://issues.apache.org/jira/browse/SPARK-32275
> Project: Spark
> Issue Type: Bug
> Components: PySpark
> Affects Versions: 2.4.4
> Environment: Pyspark 2.4.4
> Python 3.7
> Running on AWS EC2 instances with RHEL.
> Reporter: Luke Chu
> Priority: Minor
>
> While calling a spark-mllib package algorithm, specifically FPGrowth, and
> passing in a dataframe from a JDBC connector, specifically datastax's
> spark-cassandra-connector, the following is thrown at the Task level:
>
> {code:java}
> 20/05/29 01:56:07 WARN TaskSetManager: Lost task 96.0 in stage 8.0 (TID 802,
> 10.168.0.43, executor 0): org.apache.spark.api.python.PythonException:
> Traceback (most recent call last):
> File
> "/autoid/spark/spark-2.4.4-bin-hadoop2.7/python/lib/pyspark.zip/pyspark/worker.py",
> line 366, in main
> func, profiler, deserializer, serializer = read_udfs(pickleSer, infile,
> eval_type)
> File
> "/autoid/spark/spark-2.4.4-bin-hadoop2.7/python/lib/pyspark.zip/pyspark/worker.py",
> line 241, in read_udfs
> arg_offsets, udf = read_single_udf(pickleSer, infile, eval_type, runner_conf)
> File
> "/autoid/spark/spark-2.4.4-bin-hadoop2.7/python/lib/pyspark.zip/pyspark/worker.py",
> line 168, in read_single_udf
> f, return_type = read_command(pickleSer, infile)
> File
> "/autoid/spark/spark-2.4.4-bin-hadoop2.7/python/lib/pyspark.zip/pyspark/worker.py",
> line 69, in read_command
> command = serializer._read_with_length(file)
> File
> "/autoid/spark/spark-2.4.4-bin-hadoop2.7/python/lib/pyspark.zip/pyspark/serializers.py",
> line 172, in _read_with_length
> return self.loads(obj)
> File
> "/autoid/spark/spark-2.4.4-bin-hadoop2.7/python/lib/pyspark.zip/pyspark/serializers.py",
> line 580, in loads
> return pickle.loads(obj, encoding=encoding)
> File "build/bdist.linux-x86_64/egg/zoran_core/_init_.py", line 5, in <module>
> File "build/bdist.linux-x86_64/egg/zoran_core/config/conf.py", line 17, in
> <module>
> File "build/bdist.linux-x86_64/egg/zoran_core/utils/logger.py", line 5, in
> getSparkLogger
> File
> "/autoid/spark/spark-2.4.4-bin-hadoop2.7/python/lib/pyspark.zip/pyspark/sql/session.py",
> line 173, in getOrCreate
> sc = SparkContext.getOrCreate(sparkConf)
> File
> "/autoid/spark/spark-2.4.4-bin-hadoop2.7/python/lib/pyspark.zip/pyspark/context.py",
> line 367, in getOrCreate
> SparkContext(conf=conf or SparkConf())
> File
> "/autoid/spark/spark-2.4.4-bin-hadoop2.7/python/lib/pyspark.zip/pyspark/context.py",
> line 136, in _init_
> conf, jsc, profiler_cls)
> File
> "/autoid/spark/spark-2.4.4-bin-hadoop2.7/python/lib/pyspark.zip/pyspark/context.py",
> line 198, in _do_init
> self._jsc = jsc or self._initialize_context(self._conf._jconf)
> File
> "/autoid/spark/spark-2.4.4-bin-hadoop2.7/python/lib/pyspark.zip/pyspark/context.py",
> line 306, in _initialize_context
> return self._jvm.JavaSparkContext(jconf)
> File
> "/autoid/spark/spark-2.4.4-bin-hadoop2.7/python/lib/py4j-0.10.7-src.zip/py4j/java_gateway.py",
> line 1525, in _call_
> answer, self._gateway_client, None, self._fqn)
> File
> "/autoid/spark/spark-2.4.4-bin-hadoop2.7/python/lib/py4j-0.10.7-src.zip/py4j/protocol.py",
> line 336, in get_return_value
> format(target_id, ".", name))
> py4j.protocol.Py4JError: An error occurred while calling
> None.org.apache.spark.api.java.JavaSparkContext
> at
> org.apache.spark.api.python.BasePythonRunner$ReaderIterator.handlePythonException(PythonRunner.scala:456)
> at
> org.apache.spark.sql.execution.python.PythonUDFRunner$$anon$1.read(PythonUDFRunner.scala:81)
> at
> org.apache.spark.sql.execution.python.PythonUDFRunner$$anon$1.read(PythonUDFRunner.scala:64)
> at
> org.apache.spark.api.python.BasePythonRunner$ReaderIterator.hasNext(PythonRunner.scala:410)
> at
> org.apache.spark.InterruptibleIterator.hasNext(InterruptibleIterator.scala:37)
> at scala.collection.Iterator$$anon$12.hasNext(Iterator.scala:440)
> at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:409)
> at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:409)
> at
> org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIteratorForCodegenStage3.agg_doAggregateWithKeys_0$(Unknown
> Source)
> at
> org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIteratorForCodegenStage3.processNext(Unknown
> Source)
> at
> org.apache.spark.sql.execution.BufferedRowIterator.hasNext(BufferedRowIterator.java:43)
> at
> org.apache.spark.sql.execution.WholeStageCodegenExec$$anonfun$13$$anon$1.hasNext(WholeStageCodegenExec.scala:636)
> at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:409)
> at
> org.apache.spark.shuffle.sort.BypassMergeSortShuffleWriter.write(BypassMergeSortShuffleWriter.java:125)
> at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:99)
> at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:55)
> at org.apache.spark.scheduler.Task.run(Task.scala:123)
> at
> org.apache.spark.executor.Executor$TaskRunner$$anonfun$10.apply(Executor.scala:408)
> at org.apache.spark.util.Utils$.tryWithSafeFinally(Utils.scala:1360)
> at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:414)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> {code}
>
>
> Note the py4j.protocol.Py4JError: An error occurred while calling
> None.org.apache.spark.api.java.JavaSparkContext .
>
> At the top level it is a WARN so execution continues and ultimately succeeds.
> This doesn't happen when the dataframe passed to the algorithm is read from
> csv. Also, I suspect this isn't unique to spark-mllib or the
> spark-cassandra-connector due to this thread:
> [http://mail-archives.apache.org/mod_mbox/spark-user/201701.mbox/%3ccaohmdzfvxrwzjh6yesiann-lumz467bv3key68-nvzjzeno...@mail.gmail.com%3E]
>
> Here the user ran into the same problem using GraphFrames and JDBC connectors
> it seems.
>
> Just in case, this happens at the 'fit' step.
>
> {code:java}
> fp_growth = FPGrowth(itemsCol='feats', \
> minSupport=min_support, \ minConfidence=min_confidence,
> \ numPartitions=num_partitions \
> )
> model = fp_growth.fit(features_df){code}
>
> where features_df is sourced from Cassandra.
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