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Ref #17194
Flocking to snapshot files was added unintentionally in #1927.
Even at this time
PurgeFile
function was used for both wal and snapshot filesetcd/etcdserver/server.go
Lines 323 to 339 in 502396e
Did minimal changes to avoid flocking files. Don't want to refactor it now to allow easy backport to older versions.
cc @ahrtr