logical row counts can get 'off' over time due to:
messages that adjust the running counter being applied multiple times as a result of evictions
non-key updates, which get converted to inserts but are not counted as inserts at injection time, adjust the running counter when existing keys are found during the application of the insert message.
See https://tokutek.atlassian.net/browse/DB-1006 and https://bugs.launchpad.net/percona-server/+bug/1607300
See https://groups.google.com/forum/#!topic/percona-discussion/hjmx3snYX4A
https://bugs.launchpad.net/percona-server/+bug/1651844
https://github.com/georgelorchpercona/PerconaFT/tree/FT-732
http://jenkins.percona.com/view/TokuDB/job/PerconaFT-param/68/
http://jenkins.percona.com/view/PS%205.6/job/percona-server-5.6-param/1508/
http://jenkins.percona.com/view/5.7/job/mysql-5.7-param/537/
https://github.com/percona/PerconaFT/pull/364
https://github.com/percona/percona-server/pull/1308
https://github.com/percona/percona-server/pull/1309