Details
Description
I'm having a difficult time getting a GPU cluster started on Apache Spark 3.0. It was hard to find documentation on this, but I stumbled on a NVIDIA github page for Rapids which suggested the following additional edits to the spark-defaults.conf:
spark.task.resource.gpu.amount 0.25 spark.executor.resource.gpu.discoveryScript ./usr/local/spark/getGpusResources.sh
I have a Apache Spark 3.0 cluster consisting of machines with multiple nvidia-gpus and I connect my jupyter notebook to the cluster using pyspark, however it results in the following error:
Py4JJavaError: An error occurred while calling None.org.apache.spark.api.java.JavaSparkContext. : org.apache.spark.SparkException: You must specify an amount for gpu at org.apache.spark.resource.ResourceUtils$.$anonfun$parseResourceRequest$1(ResourceUtils.scala:142) at scala.collection.immutable.Map$Map1.getOrElse(Map.scala:119) at org.apache.spark.resource.ResourceUtils$.parseResourceRequest(ResourceUtils.scala:142) at org.apache.spark.resource.ResourceUtils$.$anonfun$parseAllResourceRequests$1(ResourceUtils.scala:159) at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:238) at scala.collection.mutable.ArraySeq.foreach(ArraySeq.scala:75) at scala.collection.TraversableLike.map(TraversableLike.scala:238) at scala.collection.TraversableLike.map$(TraversableLike.scala:231) at scala.collection.AbstractTraversable.map(Traversable.scala:108) at org.apache.spark.resource.ResourceUtils$.parseAllResourceRequests(ResourceUtils.scala:159) at org.apache.spark.SparkContext$.checkResourcesPerTask$1(SparkContext.scala:2773) at org.apache.spark.SparkContext$.org$apache$spark$SparkContext$$createTaskScheduler(SparkContext.scala:2884) at org.apache.spark.SparkContext.<init>(SparkContext.scala:528) at org.apache.spark.api.java.JavaSparkContext.<init>(JavaSparkContext.scala:58) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:247) at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357) at py4j.Gateway.invoke(Gateway.java:238) at py4j.commands.ConstructorCommand.invokeConstructor(ConstructorCommand.java:80) at py4j.commands.ConstructorCommand.execute(ConstructorCommand.java:69) at py4j.GatewayConnection.run(GatewayConnection.java:238) at java.lang.Thread.run(Thread.java:748)
After this, I then tried adding another line to the conf per the instructions which results in no errors, however when I log in to the Web UI at localhost:8080, under Running Applications, the state remains at waiting.
spark.task.resource.gpu.amount 2 spark.executor.resource.gpu.discoveryScript ./usr/local/spark/getGpusResources.sh spark.executor.resource.gpu.amount 1