Automatically sync dependencies with executors

INTERNALS.md

@@ -11,8 +11,6 @@ The executor classpath depends on the cluster manager used:
 
 The code entered by the user during the session is compiled and results in extra classes. These are accessible via a small web server that `AmmoniteSparkSession.builder()` launches, and whose address is passed to Spark via `"spark.repl.class.uri"` in the SparkConf.
 
-Lastly, if extra dependencies are loaded during the session after the SparkSession is created, users should call `AmmoniteSparkSession.sync()`. This passes to Spark any JAR added since the SparkSession creation, using the `addJar` method of `SparkContext`.
-
 ## `AmmoniteSparkSession` vs `SparkSession`
 
 The builder created via `AmmoniteSparkSession.builder()` extends the one from `SparkSession.builder()`. It does a number of things more compared to it.

README.md

@@ -72,10 +72,6 @@ You can then run Spark calculations, like
 @ val n = rdd.map(_ + 1).sum()
 ```
 
-### Syncing dependencies
-
-If extra dependencies are loaded, via ``import $ivy.`…` `` after the `SparkSession` has been created, one should call `AmmoniteSparkSession.sync()` for the newly added JARs to be passed to the Spark executors.
-
 ## Using with standalone cluster
 
 Simply set the master to `spark://…` when building the session, e.g.

modules/almond-spark/src/main/scala/org/apache/spark/sql/NotebookSparkSession.scala

@@ -15,6 +15,10 @@ object NotebookSparkSession {
   ): NotebookSparkSessionBuilder =
     new NotebookSparkSessionBuilder
 
+  @deprecated(
+    "Calling this method isn't needed any more, new dependencies are passed to Spark executors automatically",
+    "0.14.0-RC1"
+  )
   def sync(session: SparkSession = null)(implicit replApi: ReplAPI): SparkSession =
     AmmoniteSparkSession.sync(session)
 

modules/core/src/main/scala/org/apache/spark/sql/AmmoniteSparkSession.scala

@@ -50,6 +50,10 @@ object AmmoniteSparkSession {
     * @param session:
     *   [[SparkSession]] to add new JARs to
     */
+  @deprecated(
+    "Calling this method isn't needed any more, new dependencies are passed to Spark executors automatically",
+    "0.14.0-RC1"
+  )
   def sync(session: SparkSession = null)(implicit replApi: ReplAPI): SparkSession = {
 
     val session0 = Option(session).getOrElse {

modules/core/src/main/scala/org/apache/spark/sql/ammonitesparkinternals/AmmoniteSparkSessionBuilder.scala

@@ -355,19 +355,22 @@ class AmmoniteSparkSessionBuilder(implicit
     if (sendSparkYarnJars0 && isYarn())
       config("spark.yarn.jars", sparkJars.map(_.toASCIIString).mkString(","))
 
-    if (sendSparkJars0) {
-      val sparkJarFileSet =
-        (sparkJars.iterator ++ sparkDistClassPath.map(_.toUri).iterator ++ ignoreJars0.iterator)
-          .map(normalize)
-          .toSet
+    lazy val sparkJarFileSet =
+      (sparkJars.iterator ++ sparkDistClassPath.map(_.toUri).iterator ++ ignoreJars0.iterator)
+        .map(normalize)
+        .toSet
+
+    def toBeSent(jars: Seq[URI]): Seq[URI] = {
       val nonSparkJars = jars.filter(uri => !sparkJarFileSet.contains(normalize(uri)))
       val nonSparkJars0 =
         if (sendSourceJars0) nonSparkJars
         else nonSparkJars.filter(uri => !uri.toASCIIString.endsWith("-sources.jar"))
-      val finalNonSparkJars = keepJars0.foldLeft(nonSparkJars0)(_.filter(_))
-      config("spark.jars", finalNonSparkJars.map(_.toASCIIString).mkString(","))
+      keepJars0.foldLeft(nonSparkJars0)(_.filter(_))
     }
 
+    if (sendSparkJars0)
+      config("spark.jars", toBeSent(jars).map(_.toASCIIString).mkString(","))
+
     if (interpApi != null)
       interpApi._compilerManager.outputDir match {
         case None =>
@@ -465,6 +468,17 @@ class AmmoniteSparkSessionBuilder(implicit
     if (forceProgressBars0)
       AmmoniteSparkSessionBuilder.forceProgressBars(session.sparkContext)
 
+    for (api <- Option(replApi))
+      api.sess.frames.head.addHook {
+        new ammonite.util.Frame.Hook {
+          def addClasspath(additional: Seq[URL]): Unit = {
+            val toBeSent0 = toBeSent(additional.map(_.toURI))
+            for (uri <- toBeSent0)
+              session.sparkContext.addJar(uri.toASCIIString)
+          }
+        }
+      }
+
     session
   }
 }

modules/tests/src/main/scala/ammonite/spark/SparkReplTests.scala

@@ -549,8 +549,6 @@ class SparkReplTests(
           """
               @ import $ivy.`com.twitter::algebird-spark:0.13.5`
 
-              @ AmmoniteSparkSession.sync()
-
               @ import com.twitter.algebird.Semigroup
               import com.twitter.algebird.Semigroup