The XML dump of page and user log events is taking almost 18 hours for wikidatawiki. That's too long; split it into several pieces like the abstracts job. We can recombine them in a separate step, it's cheap enough for now.
While we're at it, see why the wikidata log file is almost 4 times larger than that for enwiki. Haven't we been here before? Are there a bunch of bot edits that are being autopatrolled or something?