[jira] [Created] (SPARK-1712) ParallelCollectionRDD operations hanging forever without any error messages

["Piotr Kołaczkowski (JIRA)" <ji...@apache.org>]

Piotr Kołaczkowski created SPARK-1712:
-----------------------------------------

             Summary: ParallelCollectionRDD operations hanging forever without any error messages 
                 Key: SPARK-1712
                 URL: https://issues.apache.org/jira/browse/SPARK-1712
             Project: Spark
          Issue Type: Bug
          Components: Spark Core
    Affects Versions: 0.9.0
         Environment: Linux Ubuntu 14.04
            Reporter: Piotr Kołaczkowski


{noformat}
scala> val collection = (1 to 1000000).map(i => ("foo" + i, i)).toVector
collection: Vector[(String, Int)] = Vector((foo1,1), (foo2,2), (foo3,3), (foo4,4), (foo5,5), (foo6,6), (foo7,7), (foo8,8), (foo9,9), (foo10,10), (foo11,11), (foo12,12), (foo13,13), (foo14,14), (foo15,15), (foo16,16), (foo17,17), (foo18,18), (foo19,19), (foo20,20), (foo21,21), (foo22,22), (foo23,23), (foo24,24), (foo25,25), (foo26,26), (foo27,27), (foo28,28), (foo29,29), (foo30,30), (foo31,31), (foo32,32), (foo33,33), (foo34,34), (foo35,35), (foo36,36), (foo37,37), (foo38,38), (foo39,39), (foo40,40), (foo41,41), (foo42,42), (foo43,43), (foo44,44), (foo45,45), (foo46,46), (foo47,47), (foo48,48), (foo49,49), (foo50,50), (foo51,51), (foo52,52), (foo53,53), (foo54,54), (foo55,55), (foo56,56), (foo57,57), (foo58,58), (foo59,59), (foo60,60), (foo61,61), (foo62,62), (foo63,63), (foo64,64), (foo...

scala> val rdd = sc.parallelize(collection)
rdd: org.apache.spark.rdd.RDD[(String, Int)] = ParallelCollectionRDD[0] at parallelize at <console>:24

scala> rdd.first
res4: (String, Int) = (foo1,1)

scala> rdd.map(_._2).sum
// nothing happens

{noformat}

CPU and I/O idle. 
Memory usage reported by JVM, after manually triggered GC:
repl: 216 MB / 2 GB
executor: 67 MB / 2 GB
worker: 6 MB / 128 MB
master: 6 MB / 128 MB

No errors found in worker's stderr/stdout. 






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