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http://www.rosuda.org/lists.shtml.
On 08/02/2013 06:57, Gaurav Dasgupta wrote:
Hi,
I have a MapReduce Java code, which I am calling from R using rJava. I have
prepared the R package and tested that successfully. But when I deployed
the package in a cluster and executed it, I am getting
ClassNotFoundException. If I run the same job directly without integrating
with R, it runs perfectly.
Here is my R code:
library(rJava)
muMstSpark <- function(mesosMaster = NULL, input = NULL, output = NULL,
scalaLib = NULL, sparkCore = NULL, inputSplits = 8) {
if (is.null(mesosMaster) || is.null(input) || is.null(output) ||
is.null(scalaLib) || is.null(sparkCore)) {
stop("Usage: muMST(<mesosMaster>, <input>, <output>, <scalaLib>,
<sparkCore>, [<inputSplits>]")
}
# Gets the absolute path of the external Scala and Java JARS
pkgPath = paste(system.file(package="MuMstBig"), "/jars", sep="")
# Initializes the JVM specifying the directory where the main Java class
resides:
.jinit("pkgPath")
# Adds all the required JARs to the class path:
.jaddClassPath(paste(pkgPath, "Prims.jar", sep="/"))
.jaddClassPath(paste(pkgPath, "MSTInSpark.jar", sep="/"))
.jaddClassPath(scalaLib)
.jaddClassPath(sparkCore)
# Creates the R object for the main Java class:
obj <- .jnew("MSTInSpark")
# Calls the Java main class
.jcall(obj, "V", "mst", c(mesosMaster, input, output, inputSplits))
}
Here is the error log:
13/02/08 00:54:48 INFO cluster.TaskSetManager: Loss was due to
java.lang.ClassNotFoundException: Prims$$anonfun$PrimsExecute$1
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at
spark.JavaDeserializationStream$$anon$1.resolveClass(JavaSerializer.scala:20)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1574)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1495)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1731)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1946)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1870)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1946)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1870)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
at scala.collection.immutable.$colon$colon.readObject(List.scala:435)
at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:969)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1946)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1870)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1946)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1870)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
at scala.collection.immutable.$colon$colon.readObject(List.scala:435)
at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:969)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1946)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1870)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1946)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1870)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
at spark.JavaDeserializationStream.readObject(JavaSerializer.scala:23)
at spark.JavaSerializerInstance.deserialize(JavaSerializer.scala:45)
at spark.executor.Executor$TaskRunner.run(Executor.scala:93)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
I think R is unable to find the classpath. But I have specified that in the
script by taking the absolute path of the JARs in the package. The
package's installed across the cluster. Any idea, whats going wrong?
Thanks,
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Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
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