Replica 3 cluster, file being healed on all 3 nodes

[Lindsay Mathieson <lindsay.mathieson@xxxxxxxxx>]

Have been testing failure mode by killing the gluster processes on a node (killall glusterd glusterfsd).

Pleasantly surprised how much smoother gluster has got at this since 3.5, heal takes a while but it no longer kills cluster performance. Probably helps that I'm using replica 3 now rather than replica 2.

However I managed to create a state where a file was being healed on all three nodes (probably y live migrating a VM while it was being healed). I didn't think that was possible without creating a split brain problem, but it eventually got all the way to being healed.

Is this the diff algorithm in play? is it comparing blocks on all three nodes using the ones that are identical across two or three nodes? If it encountered a block that was different on all three ndes would that result in split brain?

--

Lindsay

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