Eventlogging replication not working with mysql parallel consumption.

The custom replication looks at timestamps on slaves to kick of replication from master . Since we are consuming in parallel inserts are not necessarily sequential. We might need to add an autoincrement field in table to use as syncronization mechanism rather than timestamps.

Note that .. ahem... we had an autoincrement that we removed: https://phabricator.wikimedia.org/T87661