It looks like I've found the problems. To recap: I've got MySQL Server 5.7 on a
Windows Server 2012 host running an RT database of ~20GB. My mysqldump backups
started becoming truncated for some reason.
I'm not sure how much of this is relevant to Windows, but it turns out this is
what was
Small update: I was able to fix the system errors for logging. While the
err.log doesn't contain much, there were two telling entries:
2017-01-26T01:12:29.975366Z 1622 [Note] Aborted connection 1622 to db:
'rt_service' user: 'backupdb' host: 'localhost' (Got an error writing
communication
