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. -- This message was sent by Atlassian JIRA (v6.2#6252)