首先，我们清晰定位找到这几个。

1、spark-shell

2、 spark-submit

3、spark-class

 4、SparkSubmit.scala

 5、SparkILoop.scala

initializeSpark的源码

def initializeSpark() {

intp.beQuietDuring {

command("""

@transient val sc = {

val _sc = org.apache.spark.repl.Main.interp.createSparkContext()

println("Spark context available as sc.")

_sc

}

""")

command("""

@transient val sqlContext = {

val _sqlContext = org.apache.spark.repl.Main.interp.createSQLContext()

println("SQL context available as sqlContext.")

_sqlContext

}

""")

command("import org.apache.spark.SparkContext._")

command("import sqlContext.implicits._")

command("import sqlContext.sql")

command("import org.apache.spark.sql.functions._")

}

 createSparkContext的源码

// NOTE: Must be public for visibility

@DeveloperApi

def createSparkContext(): SparkContext = {

val execUri = System.getenv("SPARK_EXECUTOR_URI")

val jars = SparkILoop.getAddedJars

val conf = new SparkConf()

.setMaster(getMaster())

.setAppName("Spark shell")

.setJars(jars)

.set("spark.repl.class.uri", intp.classServerUri)

if (execUri != null) {

conf.set("spark.executor.uri", execUri)

}

sparkContext = new SparkContext(conf)

logInfo("Created spark context..")

sparkContext

}

总结

本文转自大数据躺过的坑博客园博客，原文链接：http://www.cnblogs.com/zlslch/p/5905540.html，如需转载请自行联系原作者