Site build takes 1.5 hours; it looks like it is stuck...

I'm trying to make a release. I'm in a tizzy as is usual around these times*. 1.5 hours seems totally over-the-top. I think misty's lovely automation has hidden this fact from us but needs digging on why we are taking so long. The cycle seems to be provoked by hbase-archetypes module.... but I got 'mvn log glaze disease' as soon as I tried digging in.

Filing issue in case someone else wants to have a go at this before I. Also filing if only to note that the thing does eventually finish in case I forget....

• I go to build the doc/site and the build never seems to end. First there is the issue HBASE-18821 where we were NPE'ing after a bunch of time had passed. My fix for HBASE-18821 then got me further but after what seemed hours, it failed with a cryptic message (Thanks Apache9 for figuring that I'd made an incorrect fix over in HBASE-18821). Next up I'm looking at a cycle that never seems to end... only it eventually does after 90minutes.