[KUDU-2007] Disallow a local-to-local tablet copy

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.3.1
• Component/s: recovery
• Assignee: Unassigned
• Reporter: Mike Percy
• Created: 11/May/17 20:40
• Updated: 11/May/17 23:31

Description

Make a tablet copy from the local server to the local server always fail. Currently we are missing this validation check.

Some things that might make this a little tricky:

• On multihomed hosts it may be hard to detect that the request is local
• In a recovery scenario, it's possible that a machine restored from backup could have the same UUID as an existing machine and we may want to copy a tablet from the tablet to the replacement, or vice versa. So they might end up having the same UUID.

That said, we could probably pretty easily disallow tablet copies to / from the same IP/port combination and get most of our safety bang for the buck out of that.

The situation where 2 hosts have the same UUID in a backup recovery situation might just be rare enough that we don't want to support it... but if we end up in such a situation then it may take custom programming to gracefully recover from, which would be unfortunate.