From cab1e9a723b91b6ebb68af09d7fdf11240f1bedc Mon Sep 17 00:00:00 2001
From: xiaost <xiaost7@gmail.com>
Date: Mon, 20 Apr 2015 17:49:54 +0800
Subject: [PATCH] etcdserver: skip noop entry in apply

---
 etcdserver/server.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/etcdserver/server.go b/etcdserver/server.go
index 1f5ce654a..54b187163 100644
--- a/etcdserver/server.go
+++ b/etcdserver/server.go
@@ -669,6 +669,11 @@ func (s *EtcdServer) apply(es []raftpb.Entry, confState *raftpb.ConfState) (uint
 		e := es[i]
 		switch e.Type {
 		case raftpb.EntryNormal:
+			// raft state machine may generate noop entry when leader confirmation.
+			// skip it in advance to avoid some potential bug in the future
+			if len(e.Data) == 0 {
+				break
+			}
 			var r pb.Request
 			pbutil.MustUnmarshal(&r, e.Data)
 			s.w.Trigger(r.ID, s.applyRequest(r))