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This bug is created as a clone of upstream ticket:
https://fedorahosted.org/389/ticket/48766

In a MMR environment where all the masters are under heavy load the replication changelog cache/buffer mechanism does not always use the correct anchor csn and some updates are not sent to the consumer.  

Typically it's the very first "bulk load" read from the changelog at the start of a replication session that has issues, but it can also happen during subsequent bulk loads during the same session.

Justification: This bug is severe because it could cause data loss on some random replication consumer servers without being noticed.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2016-2594.html