Wow, do you use Spark in production? I can't claim to have much experience with it, I just played around with it a loooong time ago, but I was impressed. I thought it went out of use along with Hadoop and HBase, glad to hear this is not the case. Are you hiring? :-D
I had a guy tell me he had experience with Apache's mod_rewrite module and, when asked what its purpose was, he said verbatim "It gives you, like, more commands and stuff."
Other questions were met with equally disastrous responses.
