Hi all,
I'm using CDH 5.0.1 (Spark 0.9) and submitting a job in Spark Standalone
Cluster mode.
The job is quite simple as follows:
object HBaseApp {
def main(args:Array[String]) {
testHBase("student", "/test/xt/saveRDD")
}
def testHBase(tableName: String, outFile:String) {
val sparkConf = new SparkConf()
.setAppName("-- Test HBase --")
.set("spark.executor.memory", "2g")
.set("spark.cores.max", "16")
val sparkContext = new SparkContext(sparkConf)
val rdd = sparkContext.parallelize(List(1,2,3,4,5,6,7,8,9,10), 3)
val c = rdd.count // successful
println("\n\n\n" + c + "\n\n\n")
rdd.saveAsTextFile(outFile) // This line will throw
"java.lang.ClassNotFoundException:
com.xt.scala.HBaseApp$$anonfun$testHBase$1"
println("\n down \n")
}
}
I submitted this job using the following script:
#!/bin/bash
HBASE_CLASSPATH=$(hbase classpath)
APP_JAR=/usr/games/spark/xt/SparkDemo-0.0.1-SNAPSHOT.jar
SPARK_ASSEMBLY_JAR=/usr/games/spark/xt/spark-assembly_2.10-0.9.0-cdh5.0.1-hadoop2.3.0-cdh5.0.1.jar
SPARK_MASTER=spark://b02.jsepc.com:7077
CLASSPATH=$CLASSPATH:$APP_JAR:$SPARK_ASSEMBLY_JAR:$HBASE_CLASSPATH
export SPARK_CLASSPATH=/usr/lib/hbase/lib/*
CONFIG_OPTS="-Dspark.master=$SPARK_MASTER"
java -cp $CLASSPATH $CONFIG_OPTS com.xt.scala.HBaseApp $@
After I submitted the job, the count of rdd could be computed successfully,
but that rdd could not be saved into HDFS and the following exception was
thrown:
14/10/11 16:09:33 WARN scheduler.TaskSetManager: Loss was due to
java.lang.ClassNotFoundException
java.lang.ClassNotFoundException: com.xt.scala.HBaseApp$$anonfun$testHBase$1
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:270)
at
org.apache.spark.serializer.JavaDeserializationStream$$anon$1.resolveClass(JavaSerializer.scala:37)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1612)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1517)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1990)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1915)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1990)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1915)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
at scala.collection.immutable.$colon$colon.readObject(List.scala:362)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1893)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1990)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1915)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
at
org.apache.spark.serializer.JavaDeserializationStream.readObject(JavaSerializer.scala:40)
at
org.apache.spark.scheduler.ResultTask$.deserializeInfo(ResultTask.scala:63)
at org.apache.spark.scheduler.ResultTask.readExternal(ResultTask.scala:139)
at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1837)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1796)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
at
org.apache.spark.serializer.JavaDeserializationStream.readObject(JavaSerializer.scala:40)
at
org.apache.spark.serializer.JavaSerializerInstance.deserialize(JavaSerializer.scala:62)
at
org.apache.spark.executor.Executor$TaskRunner$$anonfun$run$1.apply$mcV$sp(Executor.scala:195)
at
org.apache.spark.deploy.SparkHadoopUtil$$anon$1.run(SparkHadoopUtil.scala:42)
at
org.apache.spark.deploy.SparkHadoopUtil$$anon$1.run(SparkHadoopUtil.scala:41)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1548)
at
org.apache.spark.deploy.SparkHadoopUtil.runAsUser(SparkHadoopUtil.scala:41)
at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:178)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
I also noted that, if I add "-Dspark.jars=$APP_JAR" to the variable
*CONFIG_OPTS*, i.e., CONFIG_OPTS="-Dspark.master=$SPARK_MASTER
Dspark.jars=$APP_JAR", the job will finish successfully and rdd can be
written into HDFS.
So, what does "java.lang.ClassNotFoundException:
com.xt.scala.HBaseApp$$anonfun$testHBase$1" mean and why would it be thrown
?
Thanks
