Hi Ayan, yup that works very well however I believe Kant's other mail "Queries with streaming sources must be executed with writeStream.start()" is adding more context.
I think he is trying leverage on structured streaming and applying the rdd conversion to a streaming dataset is breaking the streaming lineage.

On Mon, Sep 11, 2017 at 3:51 AM, ayan guha <guha.ayan@gmail.com> wrote:
Sorry for side-line question, but for Python, isn't following the easiest:

>>> import json
>>> df1 = df.rdd.map(lambda r: json.dumps(r.asDict()))
>>> df1.take(10)
['{"id": 1}', '{"id": 2}', '{"id": 3}', '{"id": 4}', '{"id": 5}']

On Mon, Sep 11, 2017 at 4:22 AM, Riccardo Ferrari <ferrarir@gmail.com> wrote:
Hi Kant,

You can check the getValuesMap. I found this post useful, it is in Scala but should be a good starting point.
An alternative approach is combine the 'struct' and 'to_json' functions. I have not tested this in Java but I am using it in Python.


On Sun, Sep 10, 2017 at 1:45 AM, kant kodali <kanth909@gmail.com> wrote:
toJSON on Row object.

On Sat, Sep 9, 2017 at 4:18 PM, Felix Cheung <felixcheung_m@hotmail.com> wrote:
toJSON on Dataset/DataFrame?

From: kant kodali <kanth909@gmail.com>
Sent: Saturday, September 9, 2017 4:15:49 PM
To: user @spark
Subject: How to convert Row to JSON in Java?
Hi All,

How to convert Row to JSON in Java? It would be nice to have .toJson() method in the Row class.


Best Regards,
Ayan Guha