scala - Spark and YARN. How does the SparkPi example use the first argument as the master url? -


i'm starting out learning spark, , i'm trying replicate sparkpi example copying code new project , building jar. source sparkpi is: https://github.com/apache/spark/blob/master/examples/src/main/scala/org/apache/spark/examples/sparkpi.scala

i have working yarn cluster (running cdh 5.0.1), , i've uploaded spark assembly jar , set it's hdfs location in spark_jar.

if run command, example works:

$ spark_classpath=/usr/lib/spark/examples/lib/spark-examples_2.10-0.9.0-cdh5.0.1.jar /usr/lib/spark/bin/spark-class org.apache.spark.examples.sparkpi yarn-client 10

however, if copy source new project , build jar , run same command (with different jar , classname), following error:

$ spark_classpath=spark.jar /usr/lib/spark/bin/spark-class spark.sparkpi yarn-client 10 exception in thread "main" org.apache.spark.sparkexception: master url must set in configuration     @ org.apache.spark.sparkcontext.<init>(sparkcontext.scala:113)     @ spark.sparkpi$.main(sparkpi.scala:9)     @ spark.sparkpi.main(sparkpi.scala)

somehow, first argument isn't being passed master in sparkcontext in version, works fine in example.

looking @ sparkpi code, seems expect single numeric argument.

so there spark examples jar file intercepts first argument , somehow sets spark.master property that?

this recent change — running old code in first case , running new code in second.

here change: https://github.com/apache/spark/commit/44dd57fb66bb676d753ad8d9757f9f4c03364113

i think right command now:

/usr/lib/spark/bin/spark-submit spark.jar --class spark.sparkpi yarn-client 10

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