Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/3121#discussion_r19987234
--- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
@@ -179,6 +182,30 @@ class SparkContext(config: SparkConf) extends
SparkStatusAPI with Logging {
conf.setIfMissing("spark.driver.host", Utils.localHostName())
conf.setIfMissing("spark.driver.port", "0")
+ // This is placed after the configuration validation so that common
configuration errors, like
+ // forgetting to pass a master url or app name, don't prevent subsequent
SparkContexts from being
+ // constructed.
+ SparkContext.SPARK_CONTEXT_CONSTRUCTOR_LOCK.synchronized {
+ SparkContext.activeSparkContextCreationSite.foreach { creationSite =>
+ val errMsg = "Only one SparkContext may be active in this JVM (see
SPARK-2243)."
+ val errDetails = if
(SparkContext.activeSparkContextIsFullyConstructed) {
+ s"The currently active SparkContext was created
at:\n${creationSite.longForm}"
+ } else {
+ s"Another SparkContext is either being constructed or threw an
exception from its" +
+ " constructor; please restart your JVM in order to create a new
SparkContext." +
+ s"The current SparkContext was created
at:\n${creationSite.longForm}"
+ }
+ val exception = new SparkException(s"$errMsg $errDetails")
+ if
(conf.getBoolean("spark.driver.disableMultipleSparkContextsErrorChecking",
false)) {
--- End diff --
Here I prefer something more concise `spark.driver.disallowMultipleContexts`
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