Created attachment 1072407 [details]
Patch to add automagic split-brain resolution.

Description of problem:
From time to time, GlusterFS users, admins (and even developers) can do unfortunate things to a volume which cause split-brain to files and directories.  In such cases where the so-called "wise fool" algorithm (aka change logs) cannot determine a clean version of the file an IO error will be bubbled up to the user; thus ruining their GlusterFS clustered storage experience.

The present solution for these cases is to go into the backend and delete or move the copies of the file that aren't desired, or "pinning" to a specific replica index (which is basically choosing randomly).  For large scale installations of GlusterFS this really isn't a workable solution, and quite often a simple heuristic based on time, size or majority will suffice to resolve things automagically to most end-users satisfaction.

This patch introduces policy based split-brain resolution.

Version-Release number of selected component (if applicable):
v3.6.x

How reproducible:
100%

Steps to Reproduce:
N/A

Actual results:
N/A

Expected results:
N/A

Additional info:
N/A