Note: I am running Spark on Windows 7 in standalone mode.
In my app, I run the following:
DataFrame df = sqlContext.sql("SELECT * FROM tbBER");
System.out.println("Count: " + df.count());
tbBER is registered as a temp table in my SQLContext. When I try to print
the number of rows in the DataFrame, the job fails and I get the following
error message:
java.io.EOFException
at
java.io.ObjectInputStream$BlockDataInputStream.readFully(ObjectInputStream.java:2747)
at java.io.ObjectInputStream.readFully(ObjectInputStream.java:1033)
at
org.apache.hadoop.io.DataOutputBuffer$Buffer.write(DataOutputBuffer.java:63)
at
org.apache.hadoop.io.DataOutputBuffer.write(DataOutputBuffer.java:101)
at org.apache.hadoop.io.UTF8.readChars(UTF8.java:216)
at org.apache.hadoop.io.UTF8.readString(UTF8.java:208)
at org.apache.hadoop.mapred.FileSplit.readFields(FileSplit.java:87)
at
org.apache.hadoop.io.ObjectWritable.readObject(ObjectWritable.java:237)
at
org.apache.hadoop.io.ObjectWritable.readFields(ObjectWritable.java:66)
at
org.apache.spark.SerializableWritable$$anonfun$readObject$1.apply$mcV$sp(SerializableWritable.scala:43)
at org.apache.spark.util.Utils$.tryOrIOException(Utils.scala:1137)
at
org.apache.spark.SerializableWritable.readObject(SerializableWritable.scala:39)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at
java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
at
java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
at
java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
at
org.apache.spark.serializer.JavaDeserializationStream.readObject(JavaSerializer.scala:68)
at
org.apache.spark.serializer.JavaSerializerInstance.deserialize(JavaSerializer.scala:94)
at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:185)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
This only happens when I try to call df.count(). The rest runs fine. Is the
count() function not supported in standalone mode? The stack trace makes it
appear to be Hadoop functionality...
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