Zoltán Zvara created SPARK-7504:
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Summary: NullPointerException when initializing SparkContext in
YARN-cluster mode
Key: SPARK-7504
URL: https://issues.apache.org/jira/browse/SPARK-7504
Project: Spark
Issue Type: Bug
Components: Deploy, YARN
Reporter: Zoltán Zvara
It is not clear for most users that, while running Spark on YARN a
{{SparkContext}} with a given execution plan can be run locally as
{{yarn-client}}, but can not deploy itself to the cluster. This is currently
performed using {{org.apache.spark.deploy.yarn.Client}}. {color:gray} I think
we should support deployment through {{SparkContext}}, but this is not the
point I wish to make here. {color}
Configuring a {{SparkContext}} to deploy itself currently will yield an
{{ERROR}} while accessing {{spark.yarn.app.id}} in
{{YarnClusterSchedulerBackend}}, and after that a {{NullPointerException}}
while referencing the {{ApplicationMaster}} instance.
Spark should clearly inform the user that it might be running in
{{yarn-cluster}} mode without a proper submission using {{Client}} and that
deploying is not supported directly from {{SparkContext}}.
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