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From Bertrand <bertrand25...@gmail.com>
Subject Question about Google Books Ngrams with pyspark (1.4.1)
Date Tue, 01 Sep 2015 15:39:20 GMT
Hello everybody,

I am trying to read the Google Books Ngrams with pyspark on Amazon EC2. 

I followed the steps from :
http://spark.apache.org/docs/latest/ec2-scripts.html

and everything is working fine.

I am able to read the file  :
lines =
sc.textFile("s3n://datasets.elasticmapreduce/ngrams/books/20090715/eng-us-all/1gram")
lines.first()
u'SEQ\x06!org.apache.hadoop.io.LongWritable\x19org.apache.hadoop.io.Text\x01\x01#com.hadoop.compression.lzo.LzoCodec
\x00\x00\x00\x00\ufffd....

If I now want to read the file using :

lines =
sc.sequenceFile("s3n://datasets.elasticmapreduce/ngrams/books/20090715/eng-us-all/1gram")

I have the following error message :

15/09/01 15:28:51 WARN scheduler.TaskSetManager: Lost task 0.0 in stage 1.0
(TID 1, 172.31.61.41): java.lang.IllegalArgumentException: Unknown codec:
com.hadoop.compression.lzo.LzoCodec
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/root/spark/python/pyspark/context.py", line 544, in sequenceFile
    keyConverter, valueConverter, minSplits, batchSize)
  File "/root/spark/python/lib/py4j-0.8.2.1-src.zip/py4j/java_gateway.py",
line 538, in __call__
  File "/root/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
z:org.apache.spark.api.python.PythonRDD.sequenceFile.
: org.apache.spark.SparkException: Job aborted due to stage failure: Task 0
in stage 1.0 failed 4 times, most recent failure: Lost task 0.3 in stage 1.0
(TID 4, 172.31.61.41): java.lang.IllegalArgumentException: Unknown codec:
com.hadoop.compression.lzo.LzoCodec


Could you please help me reading the file with pyspark ?

Thank you for your help,

Cheers,

Bertrand



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