Replication Lag During Deploy of 10.3.0 RC1
We encountered replication lag while trying to deploy 10.3 RC1. This was caused by very large migrations that are touching a lot of issues.
We saw both "Postgres generating XLOG too fast" and "Postgres Replication lag is over 200MB", at which point we stopped the in flight migration.
Initial investigation shows that this may be related to 20171106135924_issues_milestone_id_foreign_key
.