:help to display the help menu:
scala> :help All commands can be abbreviated, e.g. :he instead of :help. Those marked with a * have more detailed help, e.g. :help imports. :cp <path> add a jar or directory to the classpath :help [command] print this summary or command-specific help :history [num] show the history (optional num is commands to show) :h? <string> search the history :imports [name name ...] show import history, identifying sources of names :implicits [-v] show the implicits in scope :javap <path|class> disassemble a file or class name :load <path> load and interpret a Scala file :paste enter paste mode: all input up to ctrl-D compiled tog ether :quit exit the repl :replay reset execution and replay all previous commands :reset reset the repl to its initial state, forgetting all s ession entries :sh <command line> run a shell command (result is implicitly => List[Str ing]) :silent disable/enable automatic printing of results :fallback disable/enable advanced repl changes, these fix some issues but may introduce ot hers. This mode will be removed once these fixes stablize :type [-v] <expr> display the type of an expression without evaluating it :warnings show the suppressed warnings from the most recent lin e which had any
We will explore some of the above commands throughout this lab.
Try quiting out of the Scala shell:
scala> :q Stopping spark context.
You should now be back at the CMD-line.
You may notice that the Spark applications UI webpage will not fail or load or refresh as we just quit the application:
Let's open a new Spark Scala shell. Type in
spark-shell and hit
enter to launch the shell:
USB:\spark\bin>spark-shell Welcome to ____ __ / __/__ ___ _____/ /__ _\ \/ _ \/ _ `/ __/ '_/ /___/ .__/\_,_/_/ /_/\_\ version 1.1.0 /_/ Using Scala version 2.10.4 (Java HotSpot(TM) 64-Bit Server VM, Java 1.7.0_67) Type in expressions to have them evaluated. Type :help for more information. Spark context available as sc. scala>
Now that the Spark application is running again, the corresponding UI will also be exposed at
There will be no active or completed stages listed as of yet, but after the next section, you will see activitity on this page...