Kalpit Shah created SPARK-1630:
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Summary: PythonRDDs don't handle nulls gracefully
Key: SPARK-1630
URL: https://issues.apache.org/jira/browse/SPARK-1630
Project: Spark
Issue Type: Bug
Components: PySpark
Affects Versions: 0.9.0, 0.9.1
Reporter: Kalpit Shah
Fix For: 1.0.0
If PythonRDDs receive a null element in iterators, they currently NPE. It would
be better do log a DEBUG message and skip the write of NULL elements.
Here are the 2 stack traces :
14/04/22 03:44:19 ERROR executor.Executor: Uncaught exception in thread
Thread[stdin writer for python,5,main]
java.lang.NullPointerException
at
org.apache.spark.api.python.PythonRDD$.writeIteratorToStream(PythonRDD.scala:267)
at org.apache.spark.api.python.PythonRDD$$anon$2.run(PythonRDD.scala:88)
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Py4JJavaError: An error occurred while calling
z:org.apache.spark.api.python.PythonRDD.writeToFile.
: java.lang.NullPointerException
at org.apache.spark.api.python.PythonRDD$.writeUTF(PythonRDD.scala:273)
at
org.apache.spark.api.python.PythonRDD$$anonfun$writeIteratorToStream$2.apply(PythonRDD.scala:247)
at
org.apache.spark.api.python.PythonRDD$$anonfun$writeIteratorToStream$2.apply(PythonRDD.scala:246)
at scala.collection.Iterator$class.foreach(Iterator.scala:727)
at scala.collection.AbstractIterator.foreach(Iterator.scala:1157)
at
org.apache.spark.api.python.PythonRDD$.writeIteratorToStream(PythonRDD.scala:246)
at org.apache.spark.api.python.PythonRDD$.writeToFile(PythonRDD.scala:285)
at org.apache.spark.api.python.PythonRDD$.writeToFile(PythonRDD.scala:280)
at org.apache.spark.api.python.PythonRDD.writeToFile(PythonRDD.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 py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:231)
at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:379)
at py4j.Gateway.invoke(Gateway.java:259)
at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
at py4j.commands.CallCommand.execute(CallCommand.java:79)
at py4j.GatewayConnection.run(GatewayConnection.java:207)
at java.lang.Thread.run(Thread.java:744)
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