Github user mccheah commented on the issue:
https://github.com/apache/spark/pull/21748
> there was a change in Spark recently in how the driver self-discovered
its hostname by default, if I am not mistaken. Can't recall the exact patch. I
remember that change specifically prompting us to set up the headless service
for cluster mode.
Not exactly recently, but at some point after we started work in mainline.
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