Github user srowen commented on the issue: https://github.com/apache/spark/pull/19412 I think the argument for it if anything is that it's a) deprecated, so should kinda be optional to build, and b) this would simply be consistent with how other external/* modules are handled. For Spark 2.x yes there isn't and shouldn't be an actual change to the outputs. There's a legitimate separate question here about whether it should be deprecated? my sense is yes, to leave the option to remove it in Spark 3.0, which would probably follow 2.3. I recall something about flume-ng uses an old version of Netty and it's the thing blocking updating it for all of Spark, but I may be misremembering the detail there. Yeah this passed a Maven test build as well as `dev/run-tests` now.
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