Exception when running kmeans.ipynb

[adamtracymartin]

When running kmeans.ipynb, on the step:

spark = SparkSession.builder.appName('demo').master("local").getOrCreate()

socialDF = spark.read.format("org.apache.spark.sql.cassandra").options(table="socialmedia", keyspace="accelerate").load()

print ("Table Row Count: ")
print (socialDF.count())

I receive this exception:
Py4JJavaError: An error occurred while calling o38.load.
: java.lang.NoClassDefFoundError: scala/Product$class
at com.datastax.spark.connector.util.ConfigParameter.(ConfigParameter.scala:7)
at com.datastax.spark.connector.rdd.ReadConf$.(ReadConf.scala:33)
at com.datastax.spark.connector.rdd.ReadConf$.(ReadConf.scala)
at org.apache.spark.sql.cassandra.DefaultSource$.(DefaultSource.scala:134)
at org.apache.spark.sql.cassandra.DefaultSource$.(DefaultSource.scala)
at org.apache.spark.sql.cassandra.DefaultSource.createRelation(DefaultSource.scala:55)
at org.apache.spark.sql.execution.datasources.DataSource.resolveRelation(DataSource.scala:355)
at org.apache.spark.sql.DataFrameReader.loadV1Source(DataFrameReader.scala:325)
at org.apache.spark.sql.DataFrameReader.$anonfun$load$3(DataFrameReader.scala:307)
at scala.Option.getOrElse(Option.scala:189)
at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:307)
at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:225)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:244)
at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)
at py4j.Gateway.invoke(Gateway.java:282)
at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
at py4j.commands.CallCommand.execute(CallCommand.java:79)
at py4j.GatewayConnection.run(GatewayConnection.java:238)
at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: java.lang.ClassNotFoundException: scala.Product$class
at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:471)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:589)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
... 23 more

After some reading, I have found that some of the early versions of the spark-cassandra-connector were not compatible with scala 2.11, but I cannot figure out how to fix this.

[adamtracymartin]

I figured it out. I looked at the version of the spark jars in /usr/local/spark/jars, and it was 2.12-3.1.2. So, I updated the docker-compose.yml with the latest version of the spark-cassandra-connector that I could find.

  PYSPARK_SUBMIT_ARGS: '--packages com.datastax.spark:spark-cassandra-connector_2.12:3.0.1 --conf spark.cassandra.connection.host=dse pyspark-shell'