Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/8649#issuecomment-138739307
@zjffdu could you re-word the message? I'd suggest something like:
Could not find jar containing Spark classes. The jar can be defined
using the
spark.yarn.jar configuration option. If testing Spark, either set that
option or make
sure SPARK_PREPEND_CLASSES is not set.
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