Why does Spark fail with "No File System for scheme: local"? - apache-spark

Question

I am trying to submit Spark job onto the Spark Cluster which is setup on AWS EKS as
NAME READY STATUS RESTARTS AGE
spark-master-5f98d5-5kdfd 1/1 Running 0 22h
spark-worker-878598b54-jmdcv 1/1 Running 2 3d11h
spark-worker-878598b54-sz6z6 1/1 Running 2 3d11h
i am using below manifest
apiVersion: batch/v1
kind: Job
metadata:
name: spark-on-eks
spec:
template:
spec:
containers:
- name: spark
image: repo:spark-appv6
command: [
"/bin/sh",
"-c",
"/opt/spark/bin/spark-submit \
--master spark://192.XXX.XXX.XXX:7077 \
--deploy-mode cluster \
--name spark-app \
--class com.xx.migration.convert.TestCase \
--conf spark.kubernetes.container.image=repo:spark-appv6
--conf spark.kubernetes.namespace=spark-pi \
--conf spark.kubernetes.authenticate.driver.serviceAccountName=spark-pi \
--conf spark.executor.instances=2 \
local:///opt/spark/examples/jars/testing-jar-with-dependencies.jar"
]
serviceAccountName: spark-pi
restartPolicy: Never
backoffLimit: 4
and getting below error log
20/12/25 10:06:41 INFO Utils: Successfully started service 'driverClient' on port 34511.
20/12/25 10:06:41 INFO TransportClientFactory: Successfully created connection to /192.XXX.XXX.XXX:7077 after 37 ms (0 ms spent in bootstraps)
20/12/25 10:06:41 INFO ClientEndpoint: Driver successfully submitted as driver-20201225100641-0011
20/12/25 10:06:41 INFO ClientEndpoint: ... waiting before polling master for driver state
20/12/25 10:06:46 INFO ClientEndpoint: ... polling master for driver state
20/12/25 10:06:46 INFO ClientEndpoint: State of driver-2020134340641-0011 is ERROR
20/12/25 10:06:46 ERROR ClientEndpoint: Exception from cluster was: java.io.IOException: No FileSystem for scheme: local
java.io.IOException: No FileSystem for scheme: local
at org.apache.hadoop.fs.FileSystem.getFileSystemClass(FileSystem.java:2660)
at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2667)
at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:94)
at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2703)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2685)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:373)
at org.apache.spark.util.Utils$.getHadoopFileSystem(Utils.scala:1853)
at org.apache.spark.util.Utils$.doFetchFile(Utils.scala:737)
at org.apache.spark.util.Utils$.fetchFile(Utils.scala:535)
at org.apache.spark.deploy.worker.DriverRunner.downloadUserJar(DriverRunner.scala:166)
at org.apache.spark.deploy.worker.DriverRunner.prepareAndRunDriver(DriverRunner.scala:177)
at org.apache.spark.deploy.worker.DriverRunner$$anon$2.run(DriverRunner.scala:96)
20/12/25 10:06:46 INFO ShutdownHookManager: Shutdown hook called
20/12/25 10:06:46 INFO ShutdownHookManager: Deleting directory /tmp/spark-d568b819-fe8e-486f-9b6f-741rerf87cf1
Also when i try to submit job in client mode without container parameter, it gets submitted successfully but job keeps runnings and spins multiple executors on worker nodes.
Spark version- 3.0.0
When used k8s://http://Spark-Master-ip:7077 \ i get following error
20/12/28 06:59:12 WARN NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Using Spark's default log4j profile: org/apache/spark/log4j-defaults.properties
20/12/28 06:59:12 INFO SparkKubernetesClientFactory: Auto-configuring K8S client using current context from users K8S config file
20/12/28 06:59:12 INFO KerberosConfDriverFeatureStep: You have not specified a krb5.conf file locally or via a ConfigMap. Make sure that you have the krb5.conf locally on the driver image.
20/12/28 06:59:13 WARN WatchConnectionManager: Exec Failure
java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:209)
at java.net.SocketInputStream.read(SocketInputStream.java:141)
at okio.Okio$2.read(Okio.java:140)
at okio.AsyncTimeout$2.read(AsyncTimeout.java:237)
at okio.RealBufferedSource.indexOf(RealBufferedSource.java:354)
at okio.RealBufferedSource.readUtf8LineStrict(RealBufferedSource.java:226)
at okhttp3.internal.http1.Http1Codec.readHeaderLine(Http1Codec.java:215)
at okhttp3.internal.http1.Http1Codec.readResponseHeaders(Http1Codec.java:189)
at okhttp3.internal.http.CallServerInterceptor.intercept(CallServerInterceptor.java:88)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:45)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:93)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:127)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at io.fabric8.kubernetes.client.utils.BackwardsCompatibilityInterceptor.intercept(BackwardsCompatibilityInterceptor.java:134)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at io.fabric8.kubernetes.client.utils.ImpersonatorInterceptor.intercept(ImpersonatorInterceptor.java:68)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at io.fabric8.kubernetes.client.utils.HttpClientUtils.lambda$createHttpClient$3(HttpClientUtils.java:109)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:257)
at okhttp3.RealCall$AsyncCall.execute(RealCall.java:201)
at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Please help with above requirement, Thanks

Answer 1

Assuming you're not using spark on k8s operator the master should be:
k8s://https://kubernetes.default.svc.cluster.local
if not, you can get your master address by running:
$ kubectl cluster-info
Kubernetes master is running at https://kubernetes.docker.internal:6443
EDIT:
In spark-on-k8s cluster-mode the k8s://<api_server_host>:<k8s-apiserver-port> should be provided (note that adding the port is must!)
In spark-on-k8s the role of "master" (in spark) is played by kubernetes itself - which is responsible to allocate resources for running your driver and workers.

Answer 2

The real reason for the exception:
java.io.IOException: No FileSystem for scheme: local
was that a Worker of the Spark Standalone cluster wanted to downloadUserJar, but simply didn't recognize local URI scheme.
This is because Spark Standalone does not understand it and, unless I'm mistaken, the only cluster environments that support this local URI scheme are Spark on YARN and Spark on Kubernetes.
And that's where you can connect the dots why this exception was sorted out by changing the master URL. Well, the OP wanted to deploy the Spark application to Kubernetes (and followed the rules for Spark on Kubernetes) while the master URL was spark://192.XXX.XXX.XXX:7077 which is for Spark Standalone.