https://cwiki.apache.org/confluence/display/ZOOKEEPER/Zab+vs.+Paxos
The DSN 2011 paper <http://research.yahoo.com/pub/3514> at end of the page is now 404. This should be the same paper: https://www.semanticscholar.org/paper/Zab-High-performance-broadcast-for-primary-backup-Junqueira-Reed/b02c6b00bd5dbdbd951fddb00b906c82fa80f0b3/pdf -- Cheers Michael.
