I have a simple PySpark program which publishes data into kafka. when i do a spark-submit, it gives error
Command being run :
spark-submit --packages org.apache.spark:spark-sql-kafka-0-10_2.13:3.2.0 ~/PycharmProjects/Kafka/PySpark_Kafka_SSL.py
Error :
Traceback (most recent call last):
File "/Users/karanalang/PycharmProjects/Kafka/PySpark_Kafka_SSL.py", line 33, in <module>
df.write.format('kafka')
File "/Users/karanalang/Documents/Technology/spark-3.2.0-bin-hadoop3.2/python/lib/pyspark.zip/pyspark/sql/readwriter.py", line 738, in save
File "/Users/karanalang/Documents/Technology/spark-3.2.0-bin-hadoop3.2/python/lib/py4j-0.10.9.2-src.zip/py4j/java_gateway.py", line 1309, in __call__
File "/Users/karanalang/Documents/Technology/spark-3.2.0-bin-hadoop3.2/python/lib/pyspark.zip/pyspark/sql/utils.py", line 111, in deco
File "/Users/karanalang/Documents/Technology/spark-3.2.0-bin-hadoop3.2/python/lib/py4j-0.10.9.2-src.zip/py4j/protocol.py", line 326, in get_return_value
py4j.protocol.Py4JJavaError: An error occurred while calling o41.save.
: java.lang.NoClassDefFoundError: scala/$less$colon$less
at org.apache.spark.sql.kafka010.KafkaSourceProvider.createRelation(KafkaSourceProvider.scala:180)
at org.apache.spark.sql.execution.datasources.SaveIntoDataSourceCommand.run(SaveIntoDataSourceCommand.scala:45)
at org.apache.spark.sql.execution.command.ExecutedCommandExec.sideEffectResult$lzycompute(commands.scala:75)
at org.apache.spark.sql.execution.command.ExecutedCommandExec.sideEffectResult(commands.scala:73)
at org.apache.spark.sql.execution.command.ExecutedCommandExec.executeCollect(commands.scala:84)
at org.apache.spark.sql.execution.QueryExecution$$anonfun$eagerlyExecuteCommands$1.$anonfun$applyOrElse$1(QueryExecution.scala:110)
at org.apache.spark.sql.execution.SQLExecution$.$anonfun$withNewExecutionId$5(SQLExecution.scala:103)
at org.apache.spark.sql.execution.SQLExecution$.withSQLConfPropagated(SQLExecution.scala:163)
at org.apache.spark.sql.execution.SQLExecution$.$anonfun$withNewExecutionId$1(SQLExecution.scala:90)
at org.apache.spark.sql.SparkSession.withActive(SparkSession.scala:775)
at org.apache.spark.sql.execution.SQLExecution$.withNewExecutionId(SQLExecution.scala:64)
at org.apache.spark.sql.execution.QueryExecution$$anonfun$eagerlyExecuteCommands$1.applyOrElse(QueryExecution.scala:110)
at org.apache.spark.sql.execution.QueryExecution$$anonfun$eagerlyExecuteCommands$1.applyOrElse(QueryExecution.scala:106)
at org.apache.spark.sql.catalyst.trees.TreeNode.$anonfun$transformDownWithPruning$1(TreeNode.scala:481)
at org.apache.spark.sql.catalyst.trees.CurrentOrigin$.withOrigin(TreeNode.scala:82)
at org.apache.spark.sql.catalyst.trees.TreeNode.transformDownWithPruning(TreeNode.scala:481)
at org.apache.spark.sql.catalyst.plans.logical.LogicalPlan.org$apache$spark$sql$catalyst$plans$logical$AnalysisHelper$$super$transformDownWithPruning(LogicalPlan.scala:30)
at org.apache.spark.sql.catalyst.plans.logical.AnalysisHelper.transformDownWithPruning(AnalysisHelper.scala:267)
at org.apache.spark.sql.catalyst.plans.logical.AnalysisHelper.transformDownWithPruning$(AnalysisHelper.scala:263)
at org.apache.spark.sql.catalyst.plans.logical.LogicalPlan.transformDownWithPruning(LogicalPlan.scala:30)
at org.apache.spark.sql.catalyst.plans.logical.LogicalPlan.transformDownWithPruning(LogicalPlan.scala:30)
at org.apache.spark.sql.catalyst.trees.TreeNode.transformDown(TreeNode.scala:457)
at org.apache.spark.sql.execution.QueryExecution.eagerlyExecuteCommands(QueryExecution.scala:106)
at org.apache.spark.sql.execution.QueryExecution.commandExecuted$lzycompute(QueryExecution.scala:93)
at org.apache.spark.sql.execution.QueryExecution.commandExecuted(QueryExecution.scala:91)
at org.apache.spark.sql.execution.QueryExecution.assertCommandExecuted(QueryExecution.scala:128)
at org.apache.spark.sql.DataFrameWriter.runCommand(DataFrameWriter.scala:848)
at org.apache.spark.sql.DataFrameWriter.saveToV1Source(DataFrameWriter.scala:382)
at org.apache.spark.sql.DataFrameWriter.saveInternal(DataFrameWriter.scala:355)
at org.apache.spark.sql.DataFrameWriter.save(DataFrameWriter.scala:247)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:244)
at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)
at py4j.Gateway.invoke(Gateway.java:282)
at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
at py4j.commands.CallCommand.execute(CallCommand.java:79)
at py4j.ClientServerConnection.waitForCommands(ClientServerConnection.java:182)
at py4j.ClientServerConnection.run(ClientServerConnection.java:106)
at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: java.lang.ClassNotFoundException: scala.$less$colon$less
at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:476)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:589)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
... 42 more
Spark Version – 3.2.0; I’ve confluent kafka installed on my m/c, here is the version :
Karans-MacBook-Pro:confluent-6.2.1 karanalang$ confluent local services kafka version The local commands are intended for a single-node development environment only, NOT for production usage. https://docs.confluent.io/current/cli/index.html 6.2.1-ce
Here is the code :
import sys, datetime, time, os
from pyspark.sql.functions import col, rank, dense_rank, to_date, to_timestamp, format_number, row_number, lead, lag,monotonically_increasing_id
from pyspark.sql import SparkSession, Window
spark = SparkSession.builder.appName('StructuredStreaming_KafkaProducer').getOrCreate()
kafkaBrokers='host:port'
# CA Root certificate ca.crt
caRootLocation='/Users/karanalang/Documents/Technology/strimzi/gcp-certs-dec3/caroot.pem'
# user public (user.crt)
certLocation='/Users/karanalang/Documents/Technology/strimzi/gcp-certs-dec3/my-bridge/my-bridge-user-crt.pem'
# user.key
keyLocation='/Users/karanalang/Documents/Technology/strimzi/gcp-certs-dec3/my-bridge/user-with-certs.pem'
password='passwd'
topic = "my-topic"
df = spark.read.csv("data/input.txt", header=False)
df.write.format('kafka')
.option("kafka.bootstrap.servers",kafkaBrokers)
.option("security.protocol","SSL")
.option("ssl.ca.location",caRootLocation)
.option("ssl.certificate.location", certLocation)
.option("ssl.key.location",keyLocation)
.option("ssl.key.password",password)
.option("subscribe", topic)
.save()
Any ideas what the issue is ? The Spark version seems to be matching the jar tia!
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Answer
The error:
Caused by: java.lang.ClassNotFoundException: scala.$less$colon$less
Usually pops up when something is not right with the Scala version.
If you run spark-shell, you’ll get the output:
Welcome to
____ __
/ __/__ ___ _____/ /__
_ / _ / _ `/ __/ '_/
/___/ .__/_,_/_/ /_/_ version 3.2.0
/_/
Using Scala version 2.12.15 (OpenJDK 64-Bit Server VM, Java 1.8.0_292)
It says: Using Scala version 2.12.15
It also mentions: “For the Scala API, Spark 3.2.0 uses Scala 2.12. You will need to use a compatible Scala version (2.12.x)”, in the docs.
But when we look at the spark-sql-kafka-0-10_2.13:3.2.0 in the Maven repository: Kafka 0.10+ Source For Structured Streaming » 3.2.0 it says: Scala target: Scala 2.13
I would try to specify Scala version in spark-sql-kafka, you can find desired Scala version by going to “View all targets”.
Try with: Kafka 0.10+ Source For Structured Streaming » 3.2.0:
Note the change: spark-sql-kafka-0-10_2.13:3.2.0 -> spark-sql-kafka-0-10_2.12:3.2.0
spark-submit --packages org.apache.spark:spark-sql-kafka-0-10_2.12:3.2.0 ~/PycharmProjects/Kafka/PySpark_Kafka_SSL.py