etcdserver: document v2 usage in "publish" method
Signed-off-by: Gyuho Lee <leegyuho@amazon.com>release-3.4
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@ -1980,6 +1980,12 @@ func (s *EtcdServer) sync(timeout time.Duration) {
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// static clientURLs of the server.
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// The function keeps attempting to register until it succeeds,
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// or its server is stopped.
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//
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// Use v2 store to encode member attributes, and apply through Raft
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// but does not go through v2 API endpoint, which means even with v2
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// client handler disabled (e.g. --enable-v2=false), cluster can still
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// process publish requests through rafthttp
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// TODO: Deprecate v2 store
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func (s *EtcdServer) publish(timeout time.Duration) {
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b, err := json.Marshal(s.attributes)
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if err != nil {
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