[SPARK-15024] NoClassDefFoundError in spark-examples due to Guava relocation

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Not A Problem
• Affects Version/s: 1.6.1, 1.6.2
• Component/s: Examples
• Labels: bigtop example guava

Environment

Built using:
mvn package -DrecompileMode=all -Pbigtop-dist -Pyarn -Phadoop-2.6 -Phive -Phive-thriftserver -Dprotobuf.version=2.5.0

• Assignee: Unassigned
• Reporter: Aaron Tokhy
• Created: 30/Apr/16 02:40
• Updated: 17/Feb/17 09:11
• Resolved: 17/Feb/17 09:11

Description

Currently, the spark-examples submodule builds 2 main JAR files. One is a JAR file without any shaded/relocated dependencies (target/spark-examples_<scala-version><spark-version>.jar), and another is a JAR file containing all of the shaded dependencies (under target/scala-<scala-version>/spark-examples-<spark-version>-hadoop<hadoop-version>.jar). The shaded spark-examples JAR comes out to be around ~120MB and contains many duplicates already found in the spark-assembly.

Since spark-assembly shades AND relocates Guava (to org.spark-project.guava), and most of its dependencies are already provided by spark-assembly, the non-shaded spark-examples JAR is still unable to find Guava at runtime as no relocations occur in the non shaded spark-examples.jar.

An example of one failure (spark as built by the Bigtop distribution):

$ spark-submit --deploy-mode client --class org.apache.spark.examples.sql.hive.HiveFromSpark /usr/lib/spark/lib/spark-examples.jar
...
...
Exception in thread "main" java.lang.NoClassDefFoundError: com/google/common/io/Files
	at org.apache.spark.examples.sql.hive.HiveFromSpark$.<init>(HiveFromSpark.scala:35)
	at org.apache.spark.examples.sql.hive.HiveFromSpark$.<clinit>(HiveFromSpark.scala)
	at org.apache.spark.examples.sql.hive.HiveFromSpark.main(HiveFromSpark.scala)
	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 org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:731)
	at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:181)
	at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:206)
	at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:121)
	at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
Caused by: java.lang.ClassNotFoundException: com.google.common.io.Files
	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)
	... 12 more
Command exiting with ret '1'

Issue Links

• links to: [Github] Pull Request #12800 (atokhy)