Trying to upgrade from Spark 1.0.1 to 1.1.0. Can’t imagine the upgrade is the
problem but anyway...
I get a NoClassDefFoundError for RandomGenerator when running a driver from the
CLI. But only when using a named master, even a standalone master. If I run
using master = local[4] the job executes correctly but if I set the master to
spark://Maclaurin.local:7077 though they are the same machine I get the
NoClassDefFoundError. The classpath seems correct on the CLI and the jars do
indeed contain the offending class (see below). There must be some difference
in how classes are loaded between local[4] and spark://Maclaurin.local:7077?
Any ideas?
===============
The driver is in mahout-spark_2.10-1.0-SNAPSHOT-job.jar so it’s execution means
it must be in the classpath. When I look at what’s in the jar I see
RandomGenerator.
Maclaurin:target pat$ jar tf mahout-spark_2.10-1.0-SNAPSHOT-job.jar | grep
RandomGenerator
cern/jet/random/engine/RandomGenerator.class
org/apache/commons/math3/random/GaussianRandomGenerator.class
org/apache/commons/math3/random/JDKRandomGenerator.class
org/apache/commons/math3/random/UniformRandomGenerator.class
org/apache/commons/math3/random/RandomGenerator.class <==========!
org/apache/commons/math3/random/NormalizedRandomGenerator.class
org/apache/commons/math3/random/AbstractRandomGenerator.class
org/apache/commons/math3/random/StableRandomGenerator.class
But get the following error executing the job:
14/10/19 15:39:00 WARN scheduler.TaskSetManager: Lost task 0.0 in stage 6.9
(TID 84, 192.168.0.2): java.lang.NoClassDefFoundError:
org/apache/commons/math3/random/RandomGenerator
org.apache.mahout.common.RandomUtils.getRandom(RandomUtils.java:65)
org.apache.mahout.math.cf.SimilarityAnalysis$$anonfun$5.apply(SimilarityAnalysis.scala:272)
org.apache.mahout.math.cf.SimilarityAnalysis$$anonfun$5.apply(SimilarityAnalysis.scala:267)
org.apache.mahout.sparkbindings.blas.MapBlock$$anonfun$1.apply(MapBlock.scala:33)
org.apache.mahout.sparkbindings.blas.MapBlock$$anonfun$1.apply(MapBlock.scala:32)
scala.collection.Iterator$$anon$11.next(Iterator.scala:328)
scala.collection.Iterator$$anon$13.hasNext(Iterator.scala:371)
org.apache.spark.storage.MemoryStore.unrollSafely(MemoryStore.scala:235)
org.apache.spark.CacheManager.putInBlockManager(CacheManager.scala:163)
org.apache.spark.CacheManager.getOrCompute(CacheManager.scala:70)
org.apache.spark.rdd.RDD.iterator(RDD.scala:227)
org.apache.spark.rdd.MappedRDD.compute(MappedRDD.scala:31)
org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:262)
org.apache.spark.rdd.RDD.iterator(RDD.scala:229)
org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:35)
org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:262)
org.apache.spark.rdd.RDD.iterator(RDD.scala:229)
org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:62)
org.apache.spark.scheduler.Task.run(Task.scala:54)
org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:177)
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
java.lang.Thread.run(Thread.java:695)
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