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From Fernando Paladini <fnpalad...@gmail.com>
Subject "Method json([class java.util.HashMap]) does not exist" when reading JSON
Date Tue, 29 Sep 2015 14:23:05 GMT
Hello guys,

I'm very new to Spark and I'm having some troubles when reading a JSON to
dataframe on PySpark.

I'm getting a JSON object from an API response and I would like to store it
in Spark as a DataFrame (I've read that DataFrame is better than RDD,
that's accurate?). For what I've read
<http://spark.apache.org/docs/latest/sql-programming-guide.html#starting-point-sqlcontext>
on documentation, I just need to call the method sqlContext.read.json in
order to do what I want.

*Following is the code from my test application:*
json_object = json.loads(response.text)
sc = SparkContext("local", appName="JSON to RDD")
sqlContext = SQLContext(sc)
dataframe = sqlContext.read.json(json_object)
dataframe.show()

*The problem is that when I run **"spark-submit myExample.py" I got the
following error:*
15/09/29 01:18:54 INFO BlockManagerMasterEndpoint: Registering block
manager localhost:48634 with 530.0 MB RAM, BlockManagerId(driver,
localhost, 48634)
15/09/29 01:18:54 INFO BlockManagerMaster: Registered BlockManager
Traceback (most recent call last):
  File "/home/paladini/ufxc/lisha/learning/spark-api-kairos/test1.py", line
35, in <module>
    dataframe = sqlContext.read.json(json_object)
  File "/opt/spark/python/lib/pyspark.zip/pyspark/sql/readwriter.py", line
144, in json
  File "/opt/spark/python/lib/py4j-0.8.2.1-src.zip/py4j/java_gateway.py",
line 538, in __call__
  File "/opt/spark/python/lib/pyspark.zip/pyspark/sql/utils.py", line 36,
in deco
  File "/opt/spark/python/lib/py4j-0.8.2.1-src.zip/py4j/protocol.py", line
304, in get_return_value
py4j.protocol.Py4JError: An error occurred while calling o21.json. Trace:
py4j.Py4JException: Method json([class java.util.HashMap]) does not exist
    at py4j.reflection.ReflectionEngine.getMethod(ReflectionEngine.java:333)
    at py4j.reflection.ReflectionEngine.getMethod(ReflectionEngine.java:342)
    at py4j.Gateway.invoke(Gateway.java:252)
    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(Thread.java:745)

*What I'm doing wrong? *
Check out this gist <https://gist.github.com/paladini/2e2ea913d545a407b842>
to see the JSON I'm trying to load.

Thanks!

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