As someone who just started with Spark lately, that was my first thought after being confused for a minute. It's not like people at facebook and google don't know about Apache projects. I wonder what is their motive to not avoid such name collision? I see these clashes a lot with small projects on github -ironically most of the are javascript- but rarely on a big scale like this.

generate name compare affinity in concept space if affinity > .5 repeat

yarn is framework for doing X in web programming, and this a framework for doing Y in web programming. not sure if dependency management and cluster system management are far apart enough.

They are different problem domains, I think confusing them is unlikely