CODEWITHSUNDEEP
hadoopapache-sparkhdfs
Essex
Essex

Reputation: 6138

Issue with Apache Spark working on Hadoop YARN

I'm very new with Big Data and more especially Apache Spark/Hadoop YARN.

I installed Hadoop single node into my virtual machine in order to make some tries and I added Spark too.

I think the environment is well-installed because I can access to :

Then I created a pythonic file which let to count words :

from pyspark import SparkConf, SparkContext

from operator import add
import sys
## Constants
APP_NAME = " HelloWorld of Big Data"
##OTHER FUNCTIONS/CLASSES

def main(sc,filename):
   textRDD = sc.textFile(filename)
   words = textRDD.flatMap(lambda x: x.split(' ')).map(lambda x: (x, 1))
   wordcount = words.reduceByKey(add).collect()
   for wc in wordcount:
      print wc[0],wc[1]

if __name__ == "__main__":

   # Configure Spark
   conf = SparkConf().setAppName(APP_NAME)
   conf = conf.setMaster("local[*]")
   sc   = SparkContext(conf=conf)
   filename = sys.argv[1]
   # Execute Main functionality
   main(sc, filename)

I have a textfile too named data.txt. I upload this file to HDFS with :

hadoop fs -put data.txt hdfs://localhost:9000

My file is located on : hdfs://localhost:9000/user/hduser

So I would like to execute my pythonic script thanks to Spark/Hadoop.

I made : ./bin/spark-submit /home/hduser/count.py /home/hduser/data.txt

But I get :

Traceback (most recent call last):
  File "/home/hduser/count.py", line 25, in <module>
    main(sc, filename)
  File "/home/hduser/count.py", line 13, in main
    wordcount = words.reduceByKey(add).collect()
  File "/usr/local/spark/python/lib/pyspark.zip/pyspark/rdd.py", line 1623, in reduceByKey
  File "/usr/local/spark/python/lib/pyspark.zip/pyspark/rdd.py", line 1849, in combineByKey
  File "/usr/local/spark/python/lib/pyspark.zip/pyspark/rdd.py", line 2259, in _defaultReducePartitions
  File "/usr/local/spark/python/lib/pyspark.zip/pyspark/rdd.py", line 2455, in getNumPartitions
  File "/usr/local/spark/python/lib/py4j-0.10.6-src.zip/py4j/java_gateway.py", line 1160, in __call__
  File "/usr/local/spark/python/lib/py4j-0.10.6-src.zip/py4j/protocol.py", line 320, in get_return_value
py4j.protocol.Py4JJavaError: An error occurred while calling o21.partitions.
: org.apache.hadoop.mapred.InvalidInputException: Input path does not exist: hdfs://localhost:9000/home/hduser/data.txt
    at org.apache.hadoop.mapred.FileInputFormat.singleThreadedListStatus(FileInputFormat.java:285)
    at org.apache.hadoop.mapred.FileInputFormat.listStatus(FileInputFormat.java:228)
    at org.apache.hadoop.mapred.FileInputFormat.getSplits(FileInputFormat.java:313)
    at org.apache.spark.rdd.HadoopRDD.getPartitions(HadoopRDD.scala:200)
    at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:253)
    at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:251)
    at scala.Option.getOrElse(Option.scala:121)
    at org.apache.spark.rdd.RDD.partitions(RDD.scala:251)
    at org.apache.spark.rdd.MapPartitionsRDD.getPartitions(MapPartitionsRDD.scala:35)
    at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:253)
    at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:251)
    at scala.Option.getOrElse(Option.scala:121)
    at org.apache.spark.rdd.RDD.partitions(RDD.scala:251)
    at org.apache.spark.api.java.JavaRDDLike$class.partitions(JavaRDDLike.scala:61)
    at org.apache.spark.api.java.AbstractJavaRDDLike.partitions(JavaRDDLike.scala:45)
    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:498)
    at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:244)
    at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)
    at py4j.Gateway.invoke(Gateway.java:282)
    at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
    at py4j.commands.CallCommand.execute(CallCommand.java:79)
    at py4j.GatewayConnection.run(GatewayConnection.java:214)
    at java.lang.Thread.run(Thread.java:748)

It's pretty strange because my data.txt file is into HDFS but I have this issue : Input path does not exist: hdfs://localhost:9000/home/hduser/data.txt

Any idea ?

Upvotes: 0

Views: 154

Answers (2)

Radhakrishnan Rk
Radhakrishnan Rk

Reputation: 561

Ensure HADOOP_HOME and SPARK_HOME path variable is set in your spark-env.sh. So that you can perform I/O operations with HDFS and submit jobs to YARN cluster.

Upvotes: 0

Mobin Ranjbar
Mobin Ranjbar

Reputation: 1360

Your URL is not valid. There is no home folder in HDFS. Try this instead:

./bin/spark-submit /home/hduser/count.py /user/hduser/data.txt

Upvotes: 1

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