Hi,
I'm running into an error on Windows (x64, 8.1) running Spark 1.1.0 (pre-builet
for Hadoop 2.4:
spark-1.1.0-bin-hadoop2.4.tgz<http://d3kbcqa49mib13.cloudfront.net/spark-1.1.0-bin-hadoop2.4.tgz>)
with Java SE Version 8 Update 20 (build 1.8.0_20-b26); just getting started
with Spark.
When running sc.wholeTextFiles() on a directory, I can run the command but not
do anything with the resulting RDD - specifically, I get an error in
py4j.protocol.Py4JJavaError; the error is unspecified, though the location is
included. I've attached the traceback below.
In this situation, I'm trying to load all files from a folder on the local
filesystem, located at D:\testdata. The folder contains one file, which can be
loaded successfully with sc.textFile("d:/testdata/filename") - no problems at
all - so I do not believe the file is throwing the error.
Is there any advice on what I should look at further to isolate or fix the
error? Am I doing something obviously wrong?
Thanks,
Michael
Welcome to
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_\ \/ _ \/ _ `/ __/ '_/
/__ / .__/\_,_/_/ /_/\_\ version 1.1.0
/_/
Using Python version 2.7.7 (default, Jun 11 2014 10:40:02)
SparkContext available as sc.
>>> file = sc.textFile("d:/testdata/0000cbcc5b470ec06f212990c68c8f76e887b884")
>>> file.count()
732
>>> file.first()
u'<!DOCTYPE html>'
>>> data = sc.wholeTextFiles('d:/testdata')
>>> data.first()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "D:\spark\python\pyspark\rdd.py", line 1167, in first
return self.take(1)[0]
File "D:\spark\python\pyspark\rdd.py", line 1126, in take
totalParts = self._jrdd.partitions().size()
File "D:\spark\python\lib\py4j-0.8.2.1-src.zip\py4j\java_gateway.py", line
538, in __call__
File "D:\spark\python\lib\py4j-0.8.2.1-src.zip\py4j\protocol.py", line 300,
in get_return_value
py4j.protocol.Py4JJavaError: An error occurred while calling o21.partitions.
: java.lang.NullPointerException
at java.lang.ProcessBuilder.start(Unknown Source)
at org.apache.hadoop.util.Shell.runCommand(Shell.java:445)
at org.apache.hadoop.util.Shell.run(Shell.java:418)
at
org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:650)
at org.apache.hadoop.util.Shell.execCommand(Shell.java:739)
at org.apache.hadoop.util.Shell.execCommand(Shell.java:722)
at org.apache.hadoop.fs.FileUtil.execCommand(FileUtil.java:1097)
at
org.apache.hadoop.fs.RawLocalFileSystem$DeprecatedRawLocalFileStatus.loadPermissionInfo(RawLocalFileSystem.java:559)
at
org.apache.hadoop.fs.RawLocalFileSystem$DeprecatedRawLocalFileStatus.getPermission(RawLocalFileSystem.java:534)
at
org.apache.hadoop.fs.LocatedFileStatus.<init>(LocatedFileStatus.java:42)
at org.apache.hadoop.fs.FileSystem$4.next(FileSystem.java:1697)
at org.apache.hadoop.fs.FileSystem$4.next(FileSystem.java:1679)
at
org.apache.hadoop.mapreduce.lib.input.FileInputFormat.singleThreadedListStatus(FileInputFormat.java:302)
at
org.apache.hadoop.mapreduce.lib.input.FileInputFormat.listStatus(FileInputFormat.java:263)
at
org.apache.spark.input.WholeTextFileInputFormat.setMaxSplitSize(WholeTextFileInputFormat.scala:54)
at
org.apache.spark.rdd.WholeTextFileRDD.getPartitions(NewHadoopRDD.scala:219)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:204)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:202)
at scala.Option.getOrElse(Option.scala:120)
at org.apache.spark.rdd.RDD.partitions(RDD.scala:202)
at
org.apache.spark.api.java.JavaRDDLike$class.partitions(JavaRDDLike.scala:50)
at
org.apache.spark.api.java.JavaPairRDD.partitions(JavaPairRDD.scala:44)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
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:133)
at py4j.commands.CallCommand.execute(CallCommand.java:79)
at py4j.GatewayConnection.run(GatewayConnection.java:207)
at java.lang.Thread.run(Unknown Source)
>>> data.count()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "D:\spark\python\pyspark\rdd.py", line 847, in count
return self.mapPartitions(lambda i: [sum(1 for _ in i)]).sum()
File "D:\spark\python\pyspark\rdd.py", line 838, in sum
return self.mapPartitions(lambda x: [sum(x)]).reduce(operator.add)
File "D:\spark\python\pyspark\rdd.py", line 759, in reduce
vals = self.mapPartitions(func).collect()
File "D:\spark\python\pyspark\rdd.py", line 723, in collect
bytesInJava = self._jrdd.collect().iterator()
File "D:\spark\python\lib\py4j-0.8.2.1-src.zip\py4j\java_gateway.py", line
538, in __call__
File "D:\spark\python\lib\py4j-0.8.2.1-src.zip\py4j\protocol.py", line 300,
in get_return_value
py4j.protocol.Py4JJavaError: An error occurred while calling o28.collect.
: java.lang.NullPointerException
at java.lang.ProcessBuilder.start(Unknown Source)
at org.apache.hadoop.util.Shell.runCommand(Shell.java:445)
at org.apache.hadoop.util.Shell.run(Shell.java:418)
at
org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:650)
at org.apache.hadoop.util.Shell.execCommand(Shell.java:739)
at org.apache.hadoop.util.Shell.execCommand(Shell.java:722)
at org.apache.hadoop.fs.FileUtil.execCommand(FileUtil.java:1097)
at
org.apache.hadoop.fs.RawLocalFileSystem$DeprecatedRawLocalFileStatus.loadPermissionInfo(RawLocalFileSystem.java:559)
at
org.apache.hadoop.fs.RawLocalFileSystem$DeprecatedRawLocalFileStatus.getPermission(RawLocalFileSystem.java:534)
at
org.apache.hadoop.fs.LocatedFileStatus.<init>(LocatedFileStatus.java:42)
at org.apache.hadoop.fs.FileSystem$4.next(FileSystem.java:1697)
at org.apache.hadoop.fs.FileSystem$4.next(FileSystem.java:1679)
at
org.apache.hadoop.mapreduce.lib.input.FileInputFormat.singleThreadedListStatus(FileInputFormat.java:302)
at
org.apache.hadoop.mapreduce.lib.input.FileInputFormat.listStatus(FileInputFormat.java:263)
at
org.apache.spark.input.WholeTextFileInputFormat.setMaxSplitSize(WholeTextFileInputFormat.scala:54)
at
org.apache.spark.rdd.WholeTextFileRDD.getPartitions(NewHadoopRDD.scala:219)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:204)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:202)
at scala.Option.getOrElse(Option.scala:120)
at org.apache.spark.rdd.RDD.partitions(RDD.scala:202)
at
org.apache.spark.api.python.PythonRDD.getPartitions(PythonRDD.scala:56)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:204)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:202)
at scala.Option.getOrElse(Option.scala:120)
at org.apache.spark.rdd.RDD.partitions(RDD.scala:202)
at org.apache.spark.SparkContext.runJob(SparkContext.scala:1135)
at org.apache.spark.rdd.RDD.collect(RDD.scala:774)
at
org.apache.spark.api.java.JavaRDDLike$class.collect(JavaRDDLike.scala:305)
at org.apache.spark.api.java.JavaRDD.collect(JavaRDD.scala:32)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
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:133)
at py4j.commands.CallCommand.execute(CallCommand.java:79)
at py4j.GatewayConnection.run(GatewayConnection.java:207)
at java.lang.Thread.run(Unknown Source)
>>> data.map(lambda x: len(x)).take(1)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "D:\spark\python\pyspark\rdd.py", line 1126, in take
totalParts = self._jrdd.partitions().size()
File "D:\spark\python\lib\py4j-0.8.2.1-src.zip\py4j\java_gateway.py", line
538, in __call__
File "D:\spark\python\lib\py4j-0.8.2.1-src.zip\py4j\protocol.py", line 300,
in get_return_value
py4j.protocol.Py4JJavaError: An error occurred while calling o61.partitions.
: java.lang.NullPointerException
at java.lang.ProcessBuilder.start(Unknown Source)
at org.apache.hadoop.util.Shell.runCommand(Shell.java:445)
at org.apache.hadoop.util.Shell.run(Shell.java:418)
at
org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:650)
at org.apache.hadoop.util.Shell.execCommand(Shell.java:739)
at org.apache.hadoop.util.Shell.execCommand(Shell.java:722)
at org.apache.hadoop.fs.FileUtil.execCommand(FileUtil.java:1097)
at
org.apache.hadoop.fs.RawLocalFileSystem$DeprecatedRawLocalFileStatus.loadPermissionInfo(RawLocalFileSystem.java:559)
at
org.apache.hadoop.fs.RawLocalFileSystem$DeprecatedRawLocalFileStatus.getPermission(RawLocalFileSystem.java:534)
at
org.apache.hadoop.fs.LocatedFileStatus.<init>(LocatedFileStatus.java:42)
at org.apache.hadoop.fs.FileSystem$4.next(FileSystem.java:1697)
at org.apache.hadoop.fs.FileSystem$4.next(FileSystem.java:1679)
at
org.apache.hadoop.mapreduce.lib.input.FileInputFormat.singleThreadedListStatus(FileInputFormat.java:302)
at
org.apache.hadoop.mapreduce.lib.input.FileInputFormat.listStatus(FileInputFormat.java:263)
at
org.apache.spark.input.WholeTextFileInputFormat.setMaxSplitSize(WholeTextFileInputFormat.scala:54)
at
org.apache.spark.rdd.WholeTextFileRDD.getPartitions(NewHadoopRDD.scala:219)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:204)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:202)
at scala.Option.getOrElse(Option.scala:120)
at org.apache.spark.rdd.RDD.partitions(RDD.scala:202)
at
org.apache.spark.api.python.PythonRDD.getPartitions(PythonRDD.scala:56)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:204)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:202)
at scala.Option.getOrElse(Option.scala:120)
at org.apache.spark.rdd.RDD.partitions(RDD.scala:202)
at
org.apache.spark.api.java.JavaRDDLike$class.partitions(JavaRDDLike.scala:50)
at org.apache.spark.api.java.JavaRDD.partitions(JavaRDD.scala:32)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
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:133)
at py4j.commands.CallCommand.execute(CallCommand.java:79)
at py4j.GatewayConnection.run(GatewayConnection.java:207)
at java.lang.Thread.run(Unknown Source)
