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Chris LuandGitHub
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A decode deletes the shards only after the regenerated volume is mounted and verified, so a run interrupted in that last phase leaves the volume in place with its shards partway through deletion. The re-run then finds both, tries to collect the shards again to rebuild a volume that already exists, and fails on the first shard the interrupted run had removed: generate normal volume 3 ...: ec volume 3 missing shard 6 Nothing recovers from there: the shard set is deliberately being destroyed, so every retry fails the same way while the decoded volume sits there, already complete. Finish that cleanup instead. A volume beside the shards is not enough to act on -- an encode interrupted before it deleted the original leaves the same shape, as does a decode killed while generating, whose volume may be half written -- so require a data shard to be gone. Only the deletion phase removes one, and it is also exactly the state no decode can recover from, so finishing is the only move left rather than a choice between two. The deletion still runs behind verifyDecodedVolumeBeforeDelete, the check that guards it in a normal run.