Github user tdas commented on the pull request:
https://github.com/apache/spark/pull/3485#issuecomment-64729788
@sryza I am trying to figure out the full extent of it on the current
default build as well. The issue is the mqtt-client version 0.4.0 has been
removed from certain repositories, which is causing breaks in the certain
downstream systems. In case of Spark, I think it may cause builds of our
previous versions to also break (havent tested myself). So this patch I think
tries to make it more secure for the future, so that such build breaks in
external systems do no break the building of core Spark.
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