[
https://issues.apache.org/jira/browse/SPARK-35084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17326200#comment-17326200
]
Keunhyun Oh commented on SPARK-35084:
-------------------------------------
*Spark 2.4.5*
[https://github.com/apache/spark/blob/v2.4.5/core/src/main/scala/org/apache/spark/deploy/SparkSubmit.scala]
{code:java}
if (!isMesosCluster && !isStandAloneCluster) {
// Resolve maven dependencies if there are any and add classpath to jars.
Add them to py-files
// too for packages that include Python code
val resolvedMavenCoordinates = DependencyUtils.resolveMavenDependencies(
args.packagesExclusions, args.packages, args.repositories,
args.ivyRepoPath,
args.ivySettingsPath)
if (!StringUtils.isBlank(resolvedMavenCoordinates)) {
args.jars = mergeFileLists(args.jars, resolvedMavenCoordinates)
if (args.isPython || isInternal(args.primaryResource)) {
args.pyFiles = mergeFileLists(args.pyFiles, resolvedMavenCoordinates)
}
}
// install any R packages that may have been passed through --jars or
--packages.
// Spark Packages may contain R source code inside the jar.
if (args.isR && !StringUtils.isBlank(args.jars)) {
RPackageUtils.checkAndBuildRPackage(args.jars, printStream,
args.verbose)
}
} {code}
*Spark 3.0.2*
**[https://github.com/apache/spark/blob/v3.0.2/core/src/main/scala/org/apache/spark/deploy/SparkSubmit.scala]
{code:java}
if (!StringUtils.isBlank(resolvedMavenCoordinates)) {
// In K8s client mode, when in the driver, add resolved jars early as
we might need
// them at the submit time for artifact downloading.
// For example we might use the dependencies for downloading
// files from a Hadoop Compatible fs eg. S3. In this case the user
might pass:
// --packages
com.amazonaws:aws-java-sdk:1.7.4:org.apache.hadoop:hadoop-aws:2.7.6
if (isKubernetesClusterModeDriver) {
val loader = getSubmitClassLoader(sparkConf)
for (jar <- resolvedMavenCoordinates.split(",")) {
addJarToClasspath(jar, loader)
}
} else if (isKubernetesCluster) {
// We need this in K8s cluster mode so that we can upload local deps
// via the k8s application, like in cluster mode driver
childClasspath ++= resolvedMavenCoordinates.split(",")
} else {
args.jars = mergeFileLists(args.jars, resolvedMavenCoordinates)
if (args.isPython || isInternal(args.primaryResource)) {
args.pyFiles = mergeFileLists(args.pyFiles,
resolvedMavenCoordinates)
}
}
}{code}
When using k8s master, in spark 2, jars derived from maven are added to
args.jars.
However, in spark 3, maven dependencies are not merged to args.jars.
I assume that because of it k8s cluster mode spark-submit is not supported
spark.jars.packages I expected.
So, jars from packages are not added to spark context.
> [k8s] On Spark 3, jars listed in spark.jars and spark.jars.packages are not
> added to sparkContext
> -------------------------------------------------------------------------------------------------
>
> Key: SPARK-35084
> URL: https://issues.apache.org/jira/browse/SPARK-35084
> Project: Spark
> Issue Type: Question
> Components: Kubernetes
> Affects Versions: 3.0.0, 3.0.2, 3.1.1
> Reporter: Keunhyun Oh
> Priority: Major
>
> I'm trying to migrate spark 2 to spark 3 in k8s.
>
> In my environment, on Spark 3.x, jars listed in spark.jars and
> spark.jars.packages are not added to sparkContext.
> After driver's process is launched, jars are not propagated to Executors. So,
> NoClassDefException is raised in executors.
>
> In spark.properties, the only main application jar is contained in
> spark.jars. It is different from Spark 2.
>
> How to solve this situation? Is it any changed spark options in spark 3 from
> spark 2?
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