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author | Prashant Sharma <prashant@apache.org> | 2016-06-19 20:12:00 +0100 |
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committer | Sean Owen <sowen@cloudera.com> | 2016-06-19 20:12:00 +0100 |
commit | 1b3a9b966a7813e2406dfb020e83605af22f9ef3 (patch) | |
tree | f0f27fa3095a5cb3208f882ad141070fb80e3ae7 /repl/scala-2.11/src/main | |
parent | 001a58960311b07fe80e2f01e473f4987948d06e (diff) | |
download | spark-1b3a9b966a7813e2406dfb020e83605af22f9ef3.tar.gz spark-1b3a9b966a7813e2406dfb020e83605af22f9ef3.tar.bz2 spark-1b3a9b966a7813e2406dfb020e83605af22f9ef3.zip |
[SPARK-15942][REPL] Unblock `:reset` command in REPL.
## What changes were proposed in this pull
(Paste from JIRA issue.)
As a follow up for SPARK-15697, I have following semantics for `:reset` command.
On `:reset` we forget all that user has done but not the initialization of spark. To avoid confusion or make it more clear, we show the message `spark` and `sc` are not erased, infact they are in same state as they were left by previous operations done by the user.
While doing above, somewhere I felt that this is not usually what reset means. But an accidental shutdown of a cluster can be very costly, so may be in that sense this is less surprising and still useful.
## How was this patch tested?
Manually, by calling `:reset` command, by both altering the state of SparkContext and creating some local variables.
Author: Prashant Sharma <prashant@apache.org>
Author: Prashant Sharma <prashsh1@in.ibm.com>
Closes #13661 from ScrapCodes/repl-reset-command.
Diffstat (limited to 'repl/scala-2.11/src/main')
-rw-r--r-- | repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkILoop.scala | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkILoop.scala b/repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkILoop.scala index dcf3209ae7..2707b0847a 100644 --- a/repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkILoop.scala +++ b/repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkILoop.scala @@ -36,7 +36,11 @@ class SparkILoop(in0: Option[BufferedReader], out: JPrintWriter) def initializeSpark() { intp.beQuietDuring { processLine(""" - @transient val spark = org.apache.spark.repl.Main.createSparkSession() + @transient val spark = if (org.apache.spark.repl.Main.sparkSession != null) { + org.apache.spark.repl.Main.sparkSession + } else { + org.apache.spark.repl.Main.createSparkSession() + } @transient val sc = { val _sc = spark.sparkContext _sc.uiWebUrl.foreach(webUrl => println(s"Spark context Web UI available at ${webUrl}")) @@ -50,6 +54,7 @@ class SparkILoop(in0: Option[BufferedReader], out: JPrintWriter) processLine("import spark.implicits._") processLine("import spark.sql") processLine("import org.apache.spark.sql.functions._") + replayCommandStack = Nil // remove above commands from session history. } } @@ -70,7 +75,8 @@ class SparkILoop(in0: Option[BufferedReader], out: JPrintWriter) echo("Type :help for more information.") } - private val blockedCommands = Set[String]("reset") + /** Add repl commands that needs to be blocked. e.g. reset */ + private val blockedCommands = Set[String]() /** Standard commands */ lazy val sparkStandardCommands: List[SparkILoop.this.LoopCommand] = @@ -88,6 +94,12 @@ class SparkILoop(in0: Option[BufferedReader], out: JPrintWriter) initializeSpark() super.loadFiles(settings) } + + override def resetCommand(line: String): Unit = { + super.resetCommand(line) + initializeSpark() + echo("Note that after :reset, state of SparkSession and SparkContext is unchanged.") + } } object SparkILoop { |