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dex/vendor/go.etcd.io/etcd/raft/tracker/state.go

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2020-01-31 09:32:00 +00:00
// Copyright 2019 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package tracker
// StateType is the state of a tracked follower.
type StateType uint64
const (
// StateProbe indicates a follower whose last index isn't known. Such a
// follower is "probed" (i.e. an append sent periodically) to narrow down
// its last index. In the ideal (and common) case, only one round of probing
// is necessary as the follower will react with a hint. Followers that are
// probed over extended periods of time are often offline.
StateProbe StateType = iota
// StateReplicate is the state steady in which a follower eagerly receives
// log entries to append to its log.
StateReplicate
// StateSnapshot indicates a follower that needs log entries not available
// from the leader's Raft log. Such a follower needs a full snapshot to
// return to StateReplicate.
StateSnapshot
)
var prstmap = [...]string{
"StateProbe",
"StateReplicate",
"StateSnapshot",
}
func (st StateType) String() string { return prstmap[uint64(st)] }