Hello,
1) I have been rereading kind email responses to my Spark queries. Thx.
2) I have also been reading "R" code:
1) RDD.R
2) DataFrame.R
3) All following API's =>
https://cwiki.apache.org/confluence/display/SPARK/Spark+Internals
4) Python ... https://spark.apache.org/docs/latest/programming-guide.html
Based on the above points, when I see in e.g. DataFrame.R,
calls to a function "callJMethod" ... two questions ...
- is is callJMethod calling into the JVM or better yet the
Spark Java API? Please answer in a more mathematical way without
ambiguities ... this will save too many back and forth queries ....
- if the above is true, how is the JVM "imported" into the
DataFrame.R code.
I would appreciate if you answers would be interleaved
with my questions to avoid ambiguities .. Thx,
Thx,
Vasili
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