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My knowledge with Spark is limited and you would sense it after reading this question. I have just one node and spark, Hadoop and yarn are installed on it.

I was able to code and run word-count problem in cluster mode by below command

 spark-submit --class com.sanjeevd.sparksimple.wordcount.JobRunner
              --master yarn
              --deploy-mode cluster
              --executor-memory 2g
              --executor-cores 1
              --num-executors 1

It works just fine.

Now I understood that 'spark on yarn' requires spark jar files available on the cluster and if I don't do anything then every time I run my program it will copy hundreds of jar files from $SPARK_HOME to each node (in my case it's just one node). I see that code's execution pauses for some time before it finishes copying. See below -

16/12/12 17:24:03 WARN yarn.Client: Neither spark.yarn.jars nor spark.yarn.archive is set, falling back to uploading libraries under SPARK_HOME.
16/12/12 17:24:06 INFO yarn.Client: Uploading resource file:/tmp/spark-a6cc0d6e-45f9-4712-8bac-fb363d6992f2/__spark_libs__11112433502351931.zip ->
16/12/12 17:24:08 INFO yarn.Client: Uploading resource file:/home/sanjeevd/personal/Spark-Simple/target/SparkSimple-0.0.1-SNAPSHOT.jar ->
16/12/12 17:24:08 INFO yarn.Client: Uploading resource file:/tmp/spark-a6cc0d6e-45f9-4712-8bac-fb363d6992f2/__spark_conf__6716604236006329155.zip -> hdfs://sanjeevd.br:9000/user/sanjeevd/.sparkStaging/application_1481592214176_0001/__spark_conf__.zip

Spark's documentation suggests to set spark.yarn.jars property to avoid this copying. So I set below below property in spark-defaults.conf file.

spark.yarn.jars hdfs://sanjeevd.br:9000//user/spark/share/lib

http://spark.apache.org/docs/latest/running-on-yarn.html#preparations To make Spark runtime jars accessible from YARN side, you can specify spark.yarn.archive or spark.yarn.jars. For details please refer to Spark Properties. If neither spark.yarn.archive nor spark.yarn.jars is specified, Spark will create a zip file with all jars under $SPARK_HOME/jars and upload it to the distributed cache.

Btw, I have all the jar files from LOCAL /opt/spark/jars to HDFS /user/spark/share/lib. They are 206 in number.

This makes my jar failed. Below is the error -

spark-submit --class com.sanjeevd.sparksimple.wordcount.JobRunner --master yarn --deploy-mode cluster --driver-memory=2g --executor-memory 2g --executor-cores 1 --num-executors 1 SparkSimple-0.0.1-SNAPSHOT.jar hdfs://sanjeevd.br:9000/user/spark-test/word-count/input hdfs://sanjeevd.br:9000/user/spark-test/word-count/output
16/12/12 17:43:06 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
16/12/12 17:43:07 INFO client.RMProxy: Connecting to ResourceManager at /
16/12/12 17:43:07 INFO yarn.Client: Requesting a new application from cluster with 1 NodeManagers
16/12/12 17:43:07 INFO yarn.Client: Verifying our application has not requested more than the maximum memory capability of the cluster (5120 MB per container)
16/12/12 17:43:07 INFO yarn.Client: Will allocate AM container, with 2432 MB memory including 384 MB overhead
16/12/12 17:43:07 INFO yarn.Client: Setting up container launch context for our AM
16/12/12 17:43:07 INFO yarn.Client: Setting up the launch environment for our AM container
16/12/12 17:43:07 INFO yarn.Client: Preparing resources for our AM container
16/12/12 17:43:07 INFO yarn.Client: Uploading resource file:/home/sanjeevd/personal/Spark-Simple/target/SparkSimple-0.0.1-SNAPSHOT.jar -> hdfs://sanjeevd.br:9000/user/sanjeevd/.sparkStaging/application_1481592214176_0005/SparkSimple-0.0.1-SNAPSHOT.jar
16/12/12 17:43:07 INFO yarn.Client: Uploading resource file:/tmp/spark-fae6a5ad-65d9-4b64-9ba6-65da1310ae9f/__spark_conf__7881471844385719101.zip -> hdfs://sanjeevd.br:9000/user/sanjeevd/.sparkStaging/application_1481592214176_0005/__spark_conf__.zip
16/12/12 17:43:08 INFO spark.SecurityManager: Changing view acls to: sanjeevd
16/12/12 17:43:08 INFO spark.SecurityManager: Changing modify acls to: sanjeevd
16/12/12 17:43:08 INFO spark.SecurityManager: Changing view acls groups to:
16/12/12 17:43:08 INFO spark.SecurityManager: Changing modify acls groups to:
16/12/12 17:43:08 INFO spark.SecurityManager: SecurityManager: authentication disabled; ui acls disabled; users  with view permissions: Set(sanjeevd); groups with view permissions: Set(); users  with modify permissions: Set(sanjeevd); groups with modify permissions: Set()
16/12/12 17:43:08 INFO yarn.Client: Submitting application application_1481592214176_0005 to ResourceManager
16/12/12 17:43:08 INFO impl.YarnClientImpl: Submitted application application_1481592214176_0005
16/12/12 17:43:09 INFO yarn.Client: Application report for application_1481592214176_0005 (state: ACCEPTED)
16/12/12 17:43:09 INFO yarn.Client:
 client token: N/A
 diagnostics: N/A
 ApplicationMaster host: N/A
 ApplicationMaster RPC port: -1
 queue: default
 start time: 1481593388442
 final status: UNDEFINED
 tracking URL: http://sanjeevd.br:8088/proxy/application_1481592214176_0005/
 user: sanjeevd
16/12/12 17:43:10 INFO yarn.Client: Application report for application_1481592214176_0005 (state: FAILED)
16/12/12 17:43:10 INFO yarn.Client:
 client token: N/A
 diagnostics: Application application_1481592214176_0005 failed 1 times due to AM Container for appattempt_1481592214176_0005_000001 exited with  exitCode: 1
For more detailed output, check application tracking page:http://sanjeevd.br:8088/cluster/app/application_1481592214176_0005Then, click on links to logs of each attempt.
Diagnostics: Exception from container-launch.
Container id: container_1481592214176_0005_01_000001
Exit code: 1
Stack trace: ExitCodeException exitCode=1:
    at org.apache.hadoop.util.Shell.runCommand(Shell.java:545)
    at org.apache.hadoop.util.Shell.run(Shell.java:456)
    at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:722)
    at org.apache.hadoop.yarn.server.nodemanager.DefaultContainerExecutor.launchContainer(DefaultContainerExecutor.java:211)
    at org.apache.hadoop.yarn.server.nodemanager.containermanager.launcher.ContainerLaunch.call(ContainerLaunch.java:302)
    at org.apache.hadoop.yarn.server.nodemanager.containermanager.launcher.ContainerLaunch.call(ContainerLaunch.java:82)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

Container exited with a non-zero exit code 1
Failing this attempt. Failing the application.
     ApplicationMaster host: N/A
     ApplicationMaster RPC port: -1
     queue: default
     start time: 1481593388442
     final status: FAILED
     tracking URL: http://sanjeevd.br:8088/cluster/app/application_1481592214176_0005
     user: sanjeevd
16/12/12 17:43:10 INFO yarn.Client: Deleting staging directory hdfs://sanjeevd.br:9000/user/sanjeevd/.sparkStaging/application_1481592214176_0005
Exception in thread "main" org.apache.spark.SparkException: Application application_1481592214176_0005 finished with failed status
    at org.apache.spark.deploy.yarn.Client.run(Client.scala:1132)
    at org.apache.spark.deploy.yarn.Client$.main(Client.scala:1175)
    at org.apache.spark.deploy.yarn.Client.main(Client.scala)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:736)
    at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:185)
    at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:210)
    at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:124)
    at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
16/12/12 17:43:10 INFO util.ShutdownHookManager: Shutdown hook called
16/12/12 17:43:10 INFO util.ShutdownHookManager: Deleting directory /tmp/spark-fae6a5ad-65d9-4b64-9ba6-65da1310ae9f

Do you know what wrong am I doing? The task's log says below -

Error: Could not find or load main class org.apache.spark.deploy.yarn.ApplicationMaster

I understand the error that ApplicationMaster class is not found but my question is why it is not found - where this class is supposed to be? I don't have assembly jar since I'm using spark 2.0.1 where there is no assembly comes bundled.

What this has to do with spark.yarn.jars property? This property is to help spark run on yarn, and that should be it. What additional I need to do when using spark.yarn.jars?

1 Answer

0 votes
by (32.3k points)

The property set by you above should be changed into:


Actually, you didn't put *.jar in the end and the path was just ended with /lib.ApplicationMaster.

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