问题
Getting Below exception , when i tried to perform unit tests for my spark streaming code on SBT windows using scalatest.
sbt testOnly <<ClassName>>
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*2018-06-18 02:39:00 ERROR Executor:91 - Exception in task 1.0 in stage 3.0 (TID 11) java.lang.NoSuchMethodError: net.jpountz.lz4.LZ4BlockInputStream.(Ljava/io/InputStream;Z)V at org.apache.spark.io.LZ4CompressionCodec.compressedInputStream(CompressionCodec.scala:122) at org.apache.spark.serializer.SerializerManager.wrapForCompression(SerializerManager.scala:163) at org.apache.spark.serializer.SerializerManager.wrapStream(SerializerManager.scala:124) at org.apache.spark.shuffle.BlockStoreShuffleReader$$anonfun$2.apply(BlockStoreShuffleReader.scala:50) at org.apache.spark.shuffle.BlockStoreShuffleReader$$anonfun$2.apply(BlockStoreShuffleReader.scala:50) at org.apache.spark.storage.ShuffleBlockFetcherIterator.next(ShuffleBlockFetcherIterator.scala:417) at org.apache.spark.storage.ShuffleBlockFetcherIterator.next(ShuffleBlockFetcherIterator.scala:61) at scala.collection.Iterator$$anon$12.nextCur(Iterator.scala:435) at scala.collection.Iterator$$anon$12.hasNext(Iterator.scala:441) at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:409) at org.apache.spark.util.CompletionIterator.hasNext(CompletionIterator.scala:32) at org.apache.spark.InterruptibleIterator.hasNext(InterruptibleIterator.scala:37) at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:409) at org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIteratorForCodegenStage1.sort_addToSorter$(Unknown Source) at org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIteratorForCodegenStage1.processNext(Unknown Source) at org.apache.spark.sql.execution.BufferedRowIterator.hasNext(BufferedRowIterator.java:43) at org.apache.spark.sql.execution.WholeStageCodegenExec$$anonfun$10$$anon$1.hasNext(WholeStageCodegenExec.scala:614) at org.apache.spark.sql.execution.GroupedIterator$.apply(GroupedIterator.scala:29) at org.apache.spark.sql.execution.streaming.FlatMapGroupsWithStateExec$StateStoreUpdater.updateStateForKeysWithData(FlatMapGroupsWithStateExec.scala:176)**
Tried couple of things to exclude net.jpountz.lz4 jar( with suggestions from other posts) but again same error in output.
Currently using spark 2.3 , scalatest 3.0.5, Scala 2.11 version . i see this issue only after upgrade to spark 2.3 and scalatest 3.0.5
Any suggestions ?
回答1:
Kafka has a conflicting dependency with Spark and that's what caused this issue for me.
This is how you can exclude the dependency in you sbt file
lazy val excludeJpountz = ExclusionRule(organization = "net.jpountz.lz4", name = "lz4")
lazy val kafkaClients = "org.apache.kafka" % "kafka-clients" % userKafkaVersionHere excludeAll(excludeJpountz) // add more exclusions here
When you use this kafkaClients dependency it would now exclude the problematic lz4 library.
Update:
This appears to be an issue with Kafka 0.11.x.x and earlier version. As of 1.x.x Kafka seems to have moved away from using the problematic net.jpountz.lz4 library. Therefore, using latest Kafka (1.x) with latest Spark (2.3.x) should not have this issue.
来源：https://stackoverflow.com/questions/50907437/sbt-test-error-java-lang-nosuchmethoderror-net-jpountz-lz4-lz4blockinputstream