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What changes were proposed in this pull request?
(Please fill in changes proposed in this fix)
Default topic first checks if TOPIC_OPTION_KEY is provided,
if TOPIC_OPTION_KEY is provided then
defaulttopic=TOPIC_OPTION_KEY
else TOPIC_OPTION_KEY is not provided then
defaulttopic=PATH_OPTION_KEY
How was this patch tested?
Have tested the code in local, but would start writing tests once the approach is confirmed by @jaceklaskowski, as I am expecting change requests.
PF more details on https://issues.apache.org/jira/browse/SPARK-20597
Please review http://spark.apache.org/contributing.html before opening a pull request.