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  1.     Using Spark's default log4j profile: org/apache/spark/log4j-defaults.properties
  2.    Setting default log level to "WARN".
  3.    To adjust logging level use sc.setLogLevel(newLevel). For SparkR, use setLogLevel(newLevel).
  4.    18/03/09 14:41:28 WARN NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
  5.    [Stage 0:>                                                          (0 + 4) / 4]18/03/09 14:41:31 ERROR Executor: Exception in task 3.0 in stage 0.0 (TID 3)
  6.    org.apache.spark.api.python.PythonException: Traceback (most recent call last):
  7.      File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/worker.py", line 177, in main
  8.        process()
  9.      File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/worker.py", line 172, in process
  10.        serializer.dump_stream(func(split_index, iterator), outfile)
  11.      File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 268, in dump_stream
  12.        vs = list(itertools.islice(iterator, batch))
  13.      File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 144, in load_stream
  14.        yield self._read_with_length(stream)
  15.      File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 169, in _read_with_length
  16.        return self.loads(obj)
  17.      File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 455, in loads
  18.        return pickle.loads(obj, encoding=encoding)
  19.    AttributeError: Can't get attribute 'Individual' on <module 'deap.creator' from '/usr/local/lib/python3.6/site-packages/deap-1.2.2-py3.6-macosx-10.13-x86_64.egg/deap/creator.py'>
  20.  
  21.         at org.apache.spark.api.python.PythonRunner$$anon$1.read(PythonRDD.scala:193)
  22.         at org.apache.spark.api.python.PythonRunner$$anon$1.<init>(PythonRDD.scala:234)
  23.         at org.apache.spark.api.python.PythonRunner.compute(PythonRDD.scala:152)
  24.         at org.apache.spark.api.python.PythonRDD.compute(PythonRDD.scala:63)
  25.         at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:323)
  26.         at org.apache.spark.rdd.RDD.iterator(RDD.scala:287)
  27.         at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87)
  28.         at org.apache.spark.scheduler.Task.run(Task.scala:108)
  29.         at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:338)
  30.         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
  31.         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
  32.         at java.lang.Thread.run(Thread.java:748)
  33.     18/03/09 14:41:31 ERROR Executor: Exception in task 2.0 in stage 0.0 (TID 2)
  34.     org.apache.spark.api.python.PythonException: Traceback (most recent call last):
  35.       File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/worker.py", line 177, in main
  36.         process()
  37.       File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/worker.py", line 172, in process
  38.         serializer.dump_stream(func(split_index, iterator), outfile)
  39.       File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 268, in dump_stream
  40.         vs = list(itertools.islice(iterator, batch))
  41.       File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 144, in load_stream
  42.         yield self._read_with_length(stream)
  43.       File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 169, in _read_with_length
  44.         return self.loads(obj)
  45.       File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 455, in loads
  46.         return pickle.loads(obj, encoding=encoding)
  47.     AttributeError: Can't get attribute 'Individual' on <module 'deap.creator' from '/usr/local/lib/python3.6/site-packages/deap-1.2.2-py3.6-macosx-10.13-x86_64.egg/deap/creator.py'>
  48.  
  49.        at org.apache.spark.api.python.PythonRunner$$anon$1.read(PythonRDD.scala:193)
  50.        at org.apache.spark.api.python.PythonRunner$$anon$1.<init>(PythonRDD.scala:234)
  51.        at org.apache.spark.api.python.PythonRunner.compute(PythonRDD.scala:152)
  52.        at org.apache.spark.api.python.PythonRDD.compute(PythonRDD.scala:63)
  53.        at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:323)
  54.        at org.apache.spark.rdd.RDD.iterator(RDD.scala:287)
  55.        at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87)
  56.        at org.apache.spark.scheduler.Task.run(Task.scala:108)
  57.        at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:338)
  58.        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
  59.        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
  60.        at java.lang.Thread.run(Thread.java:748)
  61.    18/03/09 14:41:31 ERROR Executor: Exception in task 1.0 in stage 0.0 (TID 1)
  62.    org.apache.spark.api.python.PythonException: Traceback (most recent call last):
  63.      File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/worker.py", line 177, in main
  64.        process()
  65.      File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/worker.py", line 172, in process
  66.        serializer.dump_stream(func(split_index, iterator), outfile)
  67.      File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 268, in dump_stream
  68.        vs = list(itertools.islice(iterator, batch))
  69.      File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 144, in load_stream
  70.        yield self._read_with_length(stream)
  71.      File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 169, in _read_with_length
  72.        return self.loads(obj)
  73.      File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 455, in loads
  74.        return pickle.loads(obj, encoding=encoding)
  75.    AttributeError: Can't get attribute 'Individual' on <module 'deap.creator' from '/usr/local/lib/python3.6/site-packages/deap-1.2.2-py3.6-macosx-10.13-x86_64.egg/deap/creator.py'>
  76.  
  77.         at org.apache.spark.api.python.PythonRunner$$anon$1.read(PythonRDD.scala:193)
  78.         at org.apache.spark.api.python.PythonRunner$$anon$1.<init>(PythonRDD.scala:234)
  79.         at org.apache.spark.api.python.PythonRunner.compute(PythonRDD.scala:152)
  80.         at org.apache.spark.api.python.PythonRDD.compute(PythonRDD.scala:63)
  81.         at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:323)
  82.         at org.apache.spark.rdd.RDD.iterator(RDD.scala:287)
  83.         at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87)
  84.         at org.apache.spark.scheduler.Task.run(Task.scala:108)
  85.         at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:338)
  86.         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
  87.         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
  88.         at java.lang.Thread.run(Thread.java:748)
  89.     18/03/09 14:41:31 ERROR Executor: Exception in task 0.0 in stage 0.0 (TID 0)
  90.     org.apache.spark.api.python.PythonException: Traceback (most recent call last):
  91.       File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/worker.py", line 177, in main
  92.         process()
  93.       File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/worker.py", line 172, in process
  94.         serializer.dump_stream(func(split_index, iterator), outfile)
  95.       File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 268, in dump_stream
  96.         vs = list(itertools.islice(iterator, batch))
  97.       File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 144, in load_stream
  98.         yield self._read_with_length(stream)
  99.       File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 169, in _read_with_length
  100.         return self.loads(obj)
  101.       File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 455, in loads
  102.         return pickle.loads(obj, encoding=encoding)
  103.     AttributeError: Can't get attribute 'Individual' on <module 'deap.creator' from '/usr/local/lib/python3.6/site-packages/deap-1.2.2-py3.6-macosx-10.13-x86_64.egg/deap/creator.py'>
  104.  
  105.        at org.apache.spark.api.python.PythonRunner$$anon$1.read(PythonRDD.scala:193)
  106.        at org.apache.spark.api.python.PythonRunner$$anon$1.<init>(PythonRDD.scala:234)
  107.        at org.apache.spark.api.python.PythonRunner.compute(PythonRDD.scala:152)
  108.        at org.apache.spark.api.python.PythonRDD.compute(PythonRDD.scala:63)
  109.        at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:323)
  110.        at org.apache.spark.rdd.RDD.iterator(RDD.scala:287)
  111.        at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87)
  112.        at org.apache.spark.scheduler.Task.run(Task.scala:108)
  113.        at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:338)
  114.        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
  115.        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
  116.        at java.lang.Thread.run(Thread.java:748)
  117.    18/03/09 14:41:31 WARN TaskSetManager: Lost task 0.0 in stage 0.0 (TID 0, localhost, executor driver): org.apache.spark.api.python.PythonException: Traceback (most recent call last):
  118.      File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/worker.py", line 177, in main
  119.        process()
  120.      File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/worker.py", line 172, in process
  121.        serializer.dump_stream(func(split_index, iterator), outfile)
  122.      File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 268, in dump_stream
  123.        vs = list(itertools.islice(iterator, batch))
  124.      File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 144, in load_stream
  125.        yield self._read_with_length(stream)
  126.      File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 169, in _read_with_length
  127.        return self.loads(obj)
  128.      File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 455, in loads
  129.        return pickle.loads(obj, encoding=encoding)
  130.    AttributeError: Can't get attribute 'Individual' on <module 'deap.creator' from '/usr/local/lib/python3.6/site-packages/deap-1.2.2-py3.6-macosx-10.13-x86_64.egg/deap/creator.py'>
  131.  
  132.         at org.apache.spark.api.python.PythonRunner$$anon$1.read(PythonRDD.scala:193)
  133.         at org.apache.spark.api.python.PythonRunner$$anon$1.<init>(PythonRDD.scala:234)
  134.         at org.apache.spark.api.python.PythonRunner.compute(PythonRDD.scala:152)
  135.         at org.apache.spark.api.python.PythonRDD.compute(PythonRDD.scala:63)
  136.         at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:323)
  137.         at org.apache.spark.rdd.RDD.iterator(RDD.scala:287)
  138.         at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87)
  139.         at org.apache.spark.scheduler.Task.run(Task.scala:108)
  140.         at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:338)
  141.         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
  142.         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
  143.         at java.lang.Thread.run(Thread.java:748)
  144.  
  145.     18/03/09 14:41:31 ERROR TaskSetManager: Task 0 in stage 0.0 failed 1 times; aborting job
  146.     Traceback (most recent call last):
  147.       File "test-deap.py", line 45, in <module>
  148.         stats=stats, halloffame=hof, verbose=True)
  149.       File "/usr/local/lib/python3.6/site-packages/deap-1.2.2-py3.6-macosx-10.13-x86_64.egg/deap/algorithms.py", line 150, in eaSimple
  150.         fitnesses = toolbox.map(toolbox.evaluate, invalid_ind)
  151.       File "test-deap.py", line 32, in sparkMap
  152.         return sc.parallelize(population).map(algorithm).collect()
  153.       File "/usr/local/lib/python3.6/site-packages/pyspark/rdd.py", line 809, in collect
  154.         port = self.ctx._jvm.PythonRDD.collectAndServe(self._jrdd.rdd())
  155.       File "/usr/local/lib/python3.6/site-packages/py4j/java_gateway.py", line 1133, in __call__
  156.         answer, self.gateway_client, self.target_id, self.name)
  157.       File "/usr/local/lib/python3.6/site-packages/py4j/protocol.py", line 319, in get_return_value
  158.         format(target_id, ".", name), value)
  159.     py4j.protocol.Py4JJavaError: An error occurred while calling z:org.apache.spark.api.python.PythonRDD.collectAndServe.
  160.     : org.apache.spark.SparkException: Job aborted due to stage failure: Task 0 in stage 0.0 failed 1 times, most recent failure: Lost task 0.0 in stage 0.0 (TID 0, localhost, executor driver): org.apache.spark.api.python.PythonException: Traceback (most recent call last):
  161.       File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/worker.py", line 177, in main
  162.         process()
  163.       File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/worker.py", line 172, in process
  164.         serializer.dump_stream(func(split_index, iterator), outfile)
  165.       File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 268, in dump_stream
  166.         vs = list(itertools.islice(iterator, batch))
  167.       File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 144, in load_stream
  168.         yield self._read_with_length(stream)
  169.       File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 169, in _read_with_length
  170.         return self.loads(obj)
  171.       File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 455, in loads
  172.         return pickle.loads(obj, encoding=encoding)
  173.     AttributeError: Can't get attribute 'Individual' on <module 'deap.creator' from '/usr/local/lib/python3.6/site-packages/deap-1.2.2-py3.6-macosx-10.13-x86_64.egg/deap/creator.py'>
  174.  
  175.        at org.apache.spark.api.python.PythonRunner$$anon$1.read(PythonRDD.scala:193)
  176.        at org.apache.spark.api.python.PythonRunner$$anon$1.<init>(PythonRDD.scala:234)
  177.        at org.apache.spark.api.python.PythonRunner.compute(PythonRDD.scala:152)
  178.        at org.apache.spark.api.python.PythonRDD.compute(PythonRDD.scala:63)
  179.        at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:323)
  180.        at org.apache.spark.rdd.RDD.iterator(RDD.scala:287)
  181.        at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87)
  182.        at org.apache.spark.scheduler.Task.run(Task.scala:108)
  183.        at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:338)
  184.        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
  185.        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
  186.        at java.lang.Thread.run(Thread.java:748)
  187.  
  188.    Driver stacktrace:
  189.        at org.apache.spark.scheduler.DAGScheduler.org$apache$spark$scheduler$DAGScheduler$$failJobAndIndependentStages(DAGScheduler.scala:1517)
  190.        at org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage$1.apply(DAGScheduler.scala:1505)
  191.        at org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage$1.apply(DAGScheduler.scala:1504)
  192.        at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
  193.        at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:48)
  194.        at org.apache.spark.scheduler.DAGScheduler.abortStage(DAGScheduler.scala:1504)
  195.        at org.apache.spark.scheduler.DAGScheduler$$anonfun$handleTaskSetFailed$1.apply(DAGScheduler.scala:814)
  196.        at org.apache.spark.scheduler.DAGScheduler$$anonfun$handleTaskSetFailed$1.apply(DAGScheduler.scala:814)
  197.        at scala.Option.foreach(Option.scala:257)
  198.        at org.apache.spark.scheduler.DAGScheduler.handleTaskSetFailed(DAGScheduler.scala:814)
  199.        at org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.doOnReceive(DAGScheduler.scala:1732)
  200.        at org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.onReceive(DAGScheduler.scala:1687)
  201.        at org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.onReceive(DAGScheduler.scala:1676)
  202.        at org.apache.spark.util.EventLoop$$anon$1.run(EventLoop.scala:48)
  203.        at org.apache.spark.scheduler.DAGScheduler.runJob(DAGScheduler.scala:630)
  204.        at org.apache.spark.SparkContext.runJob(SparkContext.scala:2029)
  205.        at org.apache.spark.SparkContext.runJob(SparkContext.scala:2050)
  206.        at org.apache.spark.SparkContext.runJob(SparkContext.scala:2069)
  207.        at org.apache.spark.SparkContext.runJob(SparkContext.scala:2094)
  208.        at org.apache.spark.rdd.RDD$$anonfun$collect$1.apply(RDD.scala:936)
  209.        at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151)
  210.        at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:112)
  211.        at org.apache.spark.rdd.RDD.withScope(RDD.scala:362)
  212.        at org.apache.spark.rdd.RDD.collect(RDD.scala:935)
  213.        at org.apache.spark.api.python.PythonRDD$.collectAndServe(PythonRDD.scala:467)
  214.        at org.apache.spark.api.python.PythonRDD.collectAndServe(PythonRDD.scala)
  215.        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  216.        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
  217.        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  218.        at java.lang.reflect.Method.invoke(Method.java:498)
  219.        at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:244)
  220.        at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)
  221.        at py4j.Gateway.invoke(Gateway.java:280)
  222.        at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
  223.        at py4j.commands.CallCommand.execute(CallCommand.java:79)
  224.        at py4j.GatewayConnection.run(GatewayConnection.java:214)
  225.        at java.lang.Thread.run(Thread.java:748)
  226.    Caused by: org.apache.spark.api.python.PythonException: Traceback (most recent call last):
  227.      File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/worker.py", line 177, in main
  228.        process()
  229.      File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/worker.py", line 172, in process
  230.        serializer.dump_stream(func(split_index, iterator), outfile)
  231.      File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 268, in dump_stream
  232.        vs = list(itertools.islice(iterator, batch))
  233.      File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 144, in load_stream
  234.        yield self._read_with_length(stream)
  235.      File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 169, in _read_with_length
  236.        return self.loads(obj)
  237.      File "/usr/local/lib/python3.6/site-packages/pyspark/python/lib/pyspark.zip/pyspark/serializers.py", line 455, in loads
  238.        return pickle.loads(obj, encoding=encoding)
  239.    AttributeError: Can't get attribute 'Individual' on <module 'deap.creator' from '/usr/local/lib/python3.6/site-packages/deap-1.2.2-py3.6-macosx-10.13-x86_64.egg/deap/creator.py'>
  240.  
  241.         at org.apache.spark.api.python.PythonRunner$$anon$1.read(PythonRDD.scala:193)
  242.         at org.apache.spark.api.python.PythonRunner$$anon$1.<init>(PythonRDD.scala:234)
  243.         at org.apache.spark.api.python.PythonRunner.compute(PythonRDD.scala:152)
  244.         at org.apache.spark.api.python.PythonRDD.compute(PythonRDD.scala:63)
  245.         at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:323)
  246.         at org.apache.spark.rdd.RDD.iterator(RDD.scala:287)
  247.         at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87)
  248.         at org.apache.spark.scheduler.Task.run(Task.scala:108)
  249.         at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:338)
  250.         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
  251.         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
  252.         ... 1 more
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