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etcdserver: clarify read index warnings

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Signed-off-by: Gyuho Lee <gyuhox@gmail.com>
This commit is contained in:
Gyuho Lee 2018-07-02 12:38:50 -07:00
parent 09addbdaa0
commit 82e670766a
1 changed files with 12 additions and 6 deletions
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18
etcdserver/v3_server.go
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@ -610,8 +610,9 @@ func (s *EtcdServer) linearizableReadLoop() {
var rs raft.ReadState
for {
ctx := make([]byte, 8)
binary.BigEndian.PutUint64(ctx, s.reqIDGen.Next())
ctxToSend := make([]byte, 8)
id1 := s.reqIDGen.Next()
binary.BigEndian.PutUint64(ctxToSend, id1)
select {
case <-s.readwaitc:
@ -627,7 +628,7 @@ func (s *EtcdServer) linearizableReadLoop() {
s.readMu.Unlock()
cctx, cancel := context.WithTimeout(context.Background(), s.Cfg.ReqTimeout())
if err := s.r.ReadIndex(cctx, ctx); err != nil {
if err := s.r.ReadIndex(cctx, ctxToSend); err != nil {
cancel()
if err == raft.ErrStopped {
return
@ -645,16 +646,22 @@ func (s *EtcdServer) linearizableReadLoop() {
for !timeout && !done {
select {
case rs = <-s.r.readStateC:
done = bytes.Equal(rs.RequestCtx, ctx)
done = bytes.Equal(rs.RequestCtx, ctxToSend)
if !done {
// a previous request might time out. now we should ignore the response of it and
// continue waiting for the response of the current requests.
plog.Warningf("ignored out-of-date read index response (want %v, got %v)", rs.RequestCtx, ctx)
id2 := uint64(0)
if len(rs.RequestCtx) == 8 {
id2 = binary.BigEndian.Uint64(rs.RequestCtx)
}
plog.Warningf("ignored out-of-date read index response; local node read indexes queueing up and waiting to be in sync with leader (request ID want %d, got %d)", id1, id2)
}
case <-time.After(s.Cfg.ReqTimeout()):
plog.Warningf("timed out waiting for read index response")
nr.notify(ErrTimeout)
timeout = true
case <-s.stopping:
return
}
@ -707,5 +714,4 @@ func (s *EtcdServer) AuthInfoFromCtx(ctx context.Context) (*auth.AuthInfo, error
}
authInfo = s.AuthStore().AuthInfoFromTLS(ctx)
return authInfo, nil
}