Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/807#issuecomment-49703872
Hey folks - I just took a light pass on this.
One thing I'm a bit confused about - the sink here is not really specific
to Spark at all (there is no dependency on Spark). The classes used are
entirely general avro classes that other applications could use easily. So why
is this being contributed to Spark instead of being put inside of Flume as a
general purpose sink that supports polling from external sources? I could
imagine that other systems might also want to integrate with flume via a
pull/polling based model than via a push model.
Was there any previous consideration to put this directly in the Flume
project?
Adding this in Spark adds some nontrivial steps to the Spark build (such as
an avro compiler). So naturally a question is whether it belongs in Spark or
Flume. I don't think we can easily change this later since we expose the
`SparkFlumePollingEvent` type directly to users, and that type is in the spark
package. Actually one related thing, can we not convert these to
`SparkFlumeEvents`'s so that the types do not differ depending on which type of
flume integration they are using? This could be confusing for users to have to
deal with a different type.
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