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abb20ec51f
This commit lets etcdserver skip needless log entry applying. If the result of log applying isn't required by the node (client that issued the request isn't talking with the node) and the operation has no side effects, applying can be skipped. It would contribute to reduce disk I/O on followers and be useful for a cluster that processes much serializable get.
pkg/ is a collection of utility packages used by etcd without being specific to etcd itself. A package belongs here only if it could possibly be moved out into its own repository in the future.