You can't do nested operations on RDDs or DataFrames (i.e. you can't create
a DataFrame from within a map function). Perhaps if you explain what you
are trying to accomplish someone can suggest another way.
On Thu, Oct 8, 2015 at 10:10 AM, Afshartous, Nick <nafshart...@turbine.com>
wrote:
>
> Hi,
>
> Am using Spark, 1.5 in latest EMR 4.1.
>
> I have an RDD of String
>
> scala> deviceIds
> res25: org.apache.spark.rdd.RDD[String] = MapPartitionsRDD[18] at
> map at <console>:28
>
> and then when trying to map over the RDD while attempting to run a sql
> query the result is a NullPointerException
>
> scala> deviceIds.map(id => sqlContext.sql("select * from
> ad_info")).count()
>
> with the stack trace below. If I run the query as a top level expression
> the count is retuned. There was additional code within
> the anonymous function that's been removed to try and isolate.
>
> Thanks for any insights or advice on how to debug this.
> --
> Nick
>
>
> scala> deviceIds.map(id => sqlContext.sql("select * from ad_info")).count()
> deviceIds.map(id => sqlContext.sql("select * from ad_info")).count()
> 15/10/08 16:12:56 INFO SparkContext: Starting job: count at <console>:40
> 15/10/08 16:12:56 INFO DAGScheduler: Got job 18 (count at <console>:40)
> with 200 output partitions
> 15/10/08 16:12:56 INFO DAGScheduler: Final stage: ResultStage 37(count at
> <console>:40)
> 15/10/08 16:12:56 INFO DAGScheduler: Parents of final stage:
> List(ShuffleMapStage 36)
> 15/10/08 16:12:56 INFO DAGScheduler: Missing parents: List()
> 15/10/08 16:12:56 INFO DAGScheduler: Submitting ResultStage 37
> (MapPartitionsRDD[37] at map at <console>:40), which has no missing parents
> 15/10/08 16:12:56 INFO MemoryStore: ensureFreeSpace(17904) called with
> curMem=531894, maxMem=560993402
> 15/10/08 16:12:56 INFO MemoryStore: Block broadcast_22 stored as values in
> memory (estimated size 17.5 KB, free 534.5 MB)
> 15/10/08 16:12:56 INFO MemoryStore: ensureFreeSpace(7143) called with
> curMem=549798, maxMem=560993402
> 15/10/08 16:12:56 INFO MemoryStore: Block broadcast_22_piece0 stored as
> bytes in memory (estimated size 7.0 KB, free 534.5 MB)
> 15/10/08 16:12:56 INFO BlockManagerInfo: Added broadcast_22_piece0 in
> memory on 10.247.0.117:33555 (size: 7.0 KB, free: 535.0 MB)
> 15/10/08 16:12:56 INFO SparkContext: Created broadcast 22 from broadcast
> at DAGScheduler.scala:861
> 15/10/08 16:12:56 INFO DAGScheduler: Submitting 200 missing tasks from
> ResultStage 37 (MapPartitionsRDD[37] at map at <console>:40)
> 15/10/08 16:12:56 INFO YarnScheduler: Adding task set 37.0 with 200 tasks
> 15/10/08 16:12:56 INFO TaskSetManager: Starting task 0.0 in stage 37.0
> (TID 649, ip-10-247-0-117.ec2.internal, PROCESS_LOCAL, 1914 bytes)
> 15/10/08 16:12:56 INFO TaskSetManager: Starting task 1.0 in stage 37.0
> (TID 650, ip-10-247-0-117.ec2.internal, PROCESS_LOCAL, 1914 bytes)
> 15/10/08 16:12:56 INFO BlockManagerInfo: Added broadcast_22_piece0 in
> memory on ip-10-247-0-117.ec2.internal:46227 (size: 7.0 KB, free: 535.0 MB)
> 15/10/08 16:12:56 INFO BlockManagerInfo: Added broadcast_22_piece0 in
> memory on ip-10-247-0-117.ec2.internal:32938 (size: 7.0 KB, free: 535.0 MB)
> 15/10/08 16:12:56 INFO TaskSetManager: Starting task 2.0 in stage 37.0
> (TID 651, ip-10-247-0-117.ec2.internal, PROCESS_LOCAL, 1914 bytes)
> 15/10/08 16:12:56 WARN TaskSetManager: Lost task 0.0 in stage 37.0 (TID
> 649, ip-10-247-0-117.ec2.internal): java.lang.NullPointerException
> at
> $line101.$read$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$anonfun$1.apply(<console>:40)
> at
> $line101.$read$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$anonfun$1.apply(<console>:40)
> at scala.collection.Iterator$$anon$11.next(Iterator.scala:328)
> at org.apache.spark.util.Utils$.getIteratorSize(Utils.scala:1555)
> at org.apache.spark.rdd.RDD$$anonfun$count$1.apply(RDD.scala:1121)
> at org.apache.spark.rdd.RDD$$anonfun$count$1.apply(RDD.scala:1121)
> at
> org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1839)
> at
> org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1839)
> at
> org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:66)
> at org.apache.spark.scheduler.Task.run(Task.scala:88)
> at
> org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:214)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:745)
>
> 15/10/08 16:12:56 INFO TaskSetManager: Starting task 0.1 in stage 37.0
> (TID 652, ip-10-247-0-117.ec2.internal, PROCESS_LOCAL, 1914 bytes)
> 15/10/08 16:12:56 INFO TaskSetManager: Lost task 1.0 in stage 37.0 (TID
> 650) on executor ip-10-247-0-117.ec2.internal:
> java.lang.NullPointerException (null) [duplicate 1]
> 15/10/08 16:12:56 INFO TaskSetManager: Starting task 1.1 in stage 37.0
> (TID 653, ip-10-247-0-117.ec2.internal, PROCESS_LOCAL, 1914 bytes)
> 15/10/08 16:12:56 INFO TaskSetManager: Lost task 2.0 in stage 37.0 (TID
> 651) on executor ip-10-247-0-117.ec2.internal:
> java.lang.NullPointerException (null) [duplicate 2]
> 15/10/08 16:12:56 INFO TaskSetManager: Starting task 2.1 in stage 37.0
> (TID 654, ip-10-247-0-117.ec2.internal, PROCESS_LOCAL, 1914 bytes)
> 15/10/08 16:12:56 INFO TaskSetManager: Lost task 0.1 in stage 37.0 (TID
> 652) on executor ip-10-247-0-117.ec2.internal:
> java.lang.NullPointerException (null) [duplicate 3]
> 15/10/08 16:12:56 INFO TaskSetManager: Starting task 0.2 in stage 37.0
> (TID 655, ip-10-247-0-117.ec2.internal, PROCESS_LOCAL, 1914 bytes)
> 15/10/08 16:12:56 INFO TaskSetManager: Lost task 1.1 in stage 37.0 (TID
> 653) on executor ip-10-247-0-117.ec2.internal:
> java.lang.NullPointerException (null) [duplicate 4]
> 15/10/08 16:12:56 INFO TaskSetManager: Starting task 1.2 in stage 37.0
> (TID 656, ip-10-247-0-117.ec2.internal, PROCESS_LOCAL, 1914 bytes)
> 15/10/08 16:12:56 INFO TaskSetManager: Lost task 2.1 in stage 37.0 (TID
> 654) on executor ip-10-247-0-117.ec2.internal:
> java.lang.NullPointerException (null) [duplicate 5]
> 15/10/08 16:12:56 INFO TaskSetManager: Starting task 2.2 in stage 37.0
> (TID 657, ip-10-247-0-117.ec2.internal, PROCESS_LOCAL, 1914 bytes)
> 15/10/08 16:12:56 INFO TaskSetManager: Lost task 0.2 in stage 37.0 (TID
> 655) on executor ip-10-247-0-117.ec2.internal:
> java.lang.NullPointerException (null) [duplicate 6]
> 15/10/08 16:12:56 INFO TaskSetManager: Starting task 0.3 in stage 37.0
> (TID 658, ip-10-247-0-117.ec2.internal, PROCESS_LOCAL, 1914 bytes)
> 15/10/08 16:12:56 INFO TaskSetManager: Lost task 2.2 in stage 37.0 (TID
> 657) on executor ip-10-247-0-117.ec2.internal:
> java.lang.NullPointerException (null) [duplicate 7]
> 15/10/08 16:12:56 INFO TaskSetManager: Starting task 2.3 in stage 37.0
> (TID 659, ip-10-247-0-117.ec2.internal, PROCESS_LOCAL, 1914 bytes)
> 15/10/08 16:12:56 INFO TaskSetManager: Lost task 1.2 in stage 37.0 (TID
> 656) on executor ip-10-247-0-117.ec2.internal:
> java.lang.NullPointerException (null) [duplicate 8]
> 15/10/08 16:12:56 INFO TaskSetManager: Starting task 1.3 in stage 37.0
> (TID 660, ip-10-247-0-117.ec2.internal, PROCESS_LOCAL, 1914 bytes)
> 15/10/08 16:12:56 INFO TaskSetManager: Lost task 0.3 in stage 37.0 (TID
> 658) on executor ip-10-247-0-117.ec2.internal:
> java.lang.NullPointerException (null) [duplicate 9]
> 15/10/08 16:12:56 ERROR TaskSetManager: Task 0 in stage 37.0 failed 4
> times; aborting job
> 15/10/08 16:12:56 INFO YarnScheduler: Cancelling stage 37
> 15/10/08 16:12:56 INFO YarnScheduler: Stage 37 was cancelled
> 15/10/08 16:12:56 INFO DAGScheduler: ResultStage 37 (count at
> <console>:40) failed in 0.128 s
> 15/10/08 16:12:56 INFO DAGScheduler: Job 18 failed: count at <console>:40,
> took 0.145419 s
> 15/10/08 16:12:56 WARN TaskSetManager: Lost task 2.3 in stage 37.0 (TID
> 659, ip-10-247-0-117.ec2.internal): TaskKilled (killed intentionally)
> 15/10/08 16:12:56 WARN TaskSetManager: Lost task 1.3 in stage 37.0 (TID
> 660, ip-10-247-0-117.ec2.internal): TaskKilled (killed intentionally)
> 15/10/08 16:12:56 INFO YarnScheduler: Removed TaskSet 37.0, whose tasks
> have all completed, from pool
> org.apache.spark.SparkException: Job aborted due to stage failure: Task 0
> in stage 37.0 failed 4 times, most recent failure: Lost task 0.3 in stage
> 37.0 (TID 658, ip-10-247-0-117.ec2.internal): java.lang.NullPointerException
> at
> $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$anonfun$1.apply(<console>:40)
> at
> $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$anonfun$1.apply(<console>:40)
> at scala.collection.Iterator$$anon$11.next(Iterator.scala:328)
> at org.apache.spark.util.Utils$.getIteratorSize(Utils.scala:1555)
> at org.apache.spark.rdd.RDD$$anonfun$count$1.apply(RDD.scala:1121)
> at org.apache.spark.rdd.RDD$$anonfun$count$1.apply(RDD.scala:1121)
> at
> org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1839)
> at
> org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1839)
> at
> org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:66)
> at org.apache.spark.scheduler.Task.run(Task.scala:88)
> at
> org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:214)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:745)
>
> Driver stacktrace:
> at org.apache.spark.scheduler.DAGScheduler.org
> $apache$spark$scheduler$DAGScheduler$$failJobAndIndependentStages(DAGScheduler.scala:1280)
> at
> org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage$1.apply(DAGScheduler.scala:1268)
> at
> org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage$1.apply(DAGScheduler.scala:1267)
> at
> scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
> at
> scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:47)
> at
> org.apache.spark.scheduler.DAGScheduler.abortStage(DAGScheduler.scala:1267)
> at
> org.apache.spark.scheduler.DAGScheduler$$anonfun$handleTaskSetFailed$1.apply(DAGScheduler.scala:697)
> at
> org.apache.spark.scheduler.DAGScheduler$$anonfun$handleTaskSetFailed$1.apply(DAGScheduler.scala:697)
> at scala.Option.foreach(Option.scala:236)
> at
> org.apache.spark.scheduler.DAGScheduler.handleTaskSetFailed(DAGScheduler.scala:697)
> at
> org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.doOnReceive(DAGScheduler.scala:1493)
> at
> org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.onReceive(DAGScheduler.scala:1455)
> at
> org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.onReceive(DAGScheduler.scala:1444)
> at org.apache.spark.util.EventLoop$$anon$1.run(EventLoop.scala:48)
> at
> org.apache.spark.scheduler.DAGScheduler.runJob(DAGScheduler.scala:567)
> at org.apache.spark.SparkContext.runJob(SparkContext.scala:1813)
> at org.apache.spark.SparkContext.runJob(SparkContext.scala:1826)
> at org.apache.spark.SparkContext.runJob(SparkContext.scala:1839)
> at org.apache.spark.SparkContext.runJob(SparkContext.scala:1910)
> at org.apache.spark.rdd.RDD.count(RDD.scala:1121)
> at
> $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:40)
> at
> $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:45)
> at
> $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:47)
> at
> $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:49)
> at
> $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:51)
> at
> $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:53)
> at
> $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:55)
> at
> $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:57)
> at
> $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:59)
> at
> $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:61)
> at
> $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:63)
> at
> $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:65)
> at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:67)
> at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:69)
> at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:71)
> at $iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:73)
> at $iwC$$iwC$$iwC$$iwC.<init>(<console>:75)
> at $iwC$$iwC$$iwC.<init>(<console>:77)
> at $iwC$$iwC.<init>(<console>:79)
> at $iwC.<init>(<console>:81)
> at <init>(<console>:83)
> at .<init>(<console>:87)
> at .<clinit>(<console>)
> at .<init>(<console>:7)
> at .<clinit>(<console>)
> at $print(<console>)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at
> org.apache.spark.repl.SparkIMain$ReadEvalPrint.call(SparkIMain.scala:1065)
> at
> org.apache.spark.repl.SparkIMain$Request.loadAndRun(SparkIMain.scala:1340)
> at
> org.apache.spark.repl.SparkIMain.loadAndRunReq$1(SparkIMain.scala:840)
> at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:871)
> at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:819)
> at
> org.apache.spark.repl.SparkILoop.reallyInterpret$1(SparkILoop.scala:857)
> at
> org.apache.spark.repl.SparkILoop.interpretStartingWith(SparkILoop.scala:902)
> at org.apache.spark.repl.SparkILoop.command(SparkILoop.scala:814)
> at
> org.apache.spark.repl.SparkILoop.processLine$1(SparkILoop.scala:657)
> at
> org.apache.spark.repl.SparkILoop.innerLoop$1(SparkILoop.scala:665)
> at org.apache.spark.repl.SparkILoop.org
> $apache$spark$repl$SparkILoop$$loop(SparkILoop.scala:670)
> at
> org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply$mcZ$sp(SparkILoop.scala:997)
> at
> org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply(SparkILoop.scala:945)
> at
> org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply(SparkILoop.scala:945)
> at
> scala.tools.nsc.util.ScalaClassLoader$.savingContextLoader(ScalaClassLoader.scala:135)
> at org.apache.spark.repl.SparkILoop.org
> $apache$spark$repl$SparkILoop$$process(SparkILoop.scala:945)
> at org.apache.spark.repl.SparkILoop.process(SparkILoop.scala:1059)
> at org.apache.spark.repl.Main$.main(Main.scala:31)
> at org.apache.spark.repl.Main.main(Main.scala)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at
> org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:672)
> at
> org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:180)
> at
> org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:205)
> at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:120)
> at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
> Caused by: java.lang.NullPointerException
> at
> $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$anonfun$1.apply(<console>:40)
> at
> $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$anonfun$1.apply(<console>:40)
> at scala.collection.Iterator$$anon$11.next(Iterator.scala:328)
> at org.apache.spark.util.Utils$.getIteratorSize(Utils.scala:1555)
> at org.apache.spark.rdd.RDD$$anonfun$count$1.apply(RDD.scala:1121)
> at org.apache.spark.rdd.RDD$$anonfun$count$1.apply(RDD.scala:1121)
> at
> org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1839)
> at
> org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1839)
> at
> org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:66)
> at org.apache.spark.scheduler.Task.run(Task.scala:88)
> at
> org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:214)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:745)
>
>
> scala> 15/10/08 16:13:45 INFO ContextCleaner: Cleaned accumulator 34
> 15/10/08 16:13:45 INFO BlockManagerInfo: Removed broadcast_22_piece0 on
> 10.247.0.117:33555 in memory (size: 7.0 KB, free: 535.0 MB)
> 15/10/08 16:13:45 INFO BlockManagerInfo: Removed broadcast_22_piece0 on
> ip-10-247-0-117.ec2.internal:46227 in memory (size: 7.0 KB, free: 535.0 MB)
> 15/10/08 16:13:45 INFO BlockManagerInfo: Removed broadcast_22_piece0 on
> ip-10-247-0-117.ec2.internal:32938 in memory (size: 7.0 KB, free: 535.0 MB)
>
>
>
> scala>
>
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