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Merge pull request #4046 from heyitsanthony/etcdserver-server-select-refactor
etcdserver: refactor server.go select loop
This commit is contained in:
Anthony Romano
commit
23d645babd
@ -468,106 +468,43 @@ func (s *EtcdServer) ReportSnapshot(id uint64, status raft.SnapshotStatus) {
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s.r.ReportSnapshot(id, status)
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}
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type etcdProgress struct {
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confState raftpb.ConfState
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snapi uint64
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appliedi uint64
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}
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func (s *EtcdServer) run() {
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snap, err := s.r.raftStorage.Snapshot()
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if err != nil {
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plog.Panicf("get snapshot from raft storage error: %v", err)
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}
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confState := snap.Metadata.ConfState
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snapi := snap.Metadata.Index
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appliedi := snapi
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s.r.start(s)
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defer func() {
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s.r.stop()
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close(s.done)
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}()
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var shouldstop bool
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ep := etcdProgress{
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confState: snap.Metadata.ConfState,
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snapi: snap.Metadata.Index,
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appliedi: snap.Metadata.Index,
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}
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for {
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select {
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case apply := <-s.r.apply():
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// apply snapshot
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if !raft.IsEmptySnap(apply.snapshot) {
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if apply.snapshot.Metadata.Index <= appliedi {
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plog.Panicf("snapshot index [%d] should > appliedi[%d] + 1",
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apply.snapshot.Metadata.Index, appliedi)
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}
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if s.cfg.V3demo {
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snapfn, err := s.r.storage.DBFilePath(apply.snapshot.Metadata.Index)
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if err != nil {
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plog.Panicf("get database snapshot file path error: %v", err)
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}
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fn := path.Join(s.cfg.SnapDir(), databaseFilename)
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if err := os.Rename(snapfn, fn); err != nil {
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plog.Panicf("rename snapshot file error: %v", err)
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}
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newKV := dstorage.New(fn, &s.consistIndex)
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if err := newKV.Restore(); err != nil {
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plog.Panicf("restore KV error: %v", err)
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}
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oldKV := s.swapKV(newKV)
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// Closing oldKV might block until all the txns
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// on the kv are finished.
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// We do not want to wait on closing the old kv.
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go func() {
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if err := oldKV.Close(); err != nil {
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plog.Panicf("close KV error: %v", err)
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}
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}()
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}
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if err := s.store.Recovery(apply.snapshot.Data); err != nil {
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plog.Panicf("recovery store error: %v", err)
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}
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s.cluster.Recover()
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// recover raft transport
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s.r.transport.RemoveAllPeers()
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for _, m := range s.cluster.Members() {
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if m.ID == s.ID() {
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continue
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}
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s.r.transport.AddPeer(m.ID, m.PeerURLs)
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}
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appliedi = apply.snapshot.Metadata.Index
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snapi = appliedi
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confState = apply.snapshot.Metadata.ConfState
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plog.Infof("recovered from incoming snapshot at index %d", snapi)
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}
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// apply entries
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if len(apply.entries) != 0 {
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firsti := apply.entries[0].Index
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if firsti > appliedi+1 {
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plog.Panicf("first index of committed entry[%d] should <= appliedi[%d] + 1", firsti, appliedi)
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}
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var ents []raftpb.Entry
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if appliedi+1-firsti < uint64(len(apply.entries)) {
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ents = apply.entries[appliedi+1-firsti:]
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}
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if appliedi, shouldstop = s.apply(ents, &confState); shouldstop {
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go s.stopWithDelay(10*100*time.Millisecond, fmt.Errorf("the member has been permanently removed from the cluster"))
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}
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}
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s.applySnapshot(&ep, &apply)
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s.applyEntries(&ep, &apply)
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// wait for the raft routine to finish the disk writes before triggering a
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// snapshot. or applied index might be greater than the last index in raft
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// storage, since the raft routine might be slower than apply routine.
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apply.done <- struct{}{}
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// trigger snapshot
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if appliedi-snapi > s.snapCount {
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plog.Infof("start to snapshot (applied: %d, lastsnap: %d)", appliedi, snapi)
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s.snapshot(appliedi, confState)
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snapi = appliedi
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}
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s.triggerSnapshot(&ep)
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case m := <-s.msgSnapC:
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merged := s.createMergedSnapshotMessage(m, appliedi, confState)
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merged := s.createMergedSnapshotMessage(m, ep.appliedi, ep.confState)
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s.r.transport.SendSnapshot(merged)
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case err := <-s.errorc:
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plog.Errorf("%s", err)
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@ -579,6 +516,90 @@ func (s *EtcdServer) run() {
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}
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}
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func (s *EtcdServer) applySnapshot(ep *etcdProgress, apply *apply) {
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if raft.IsEmptySnap(apply.snapshot) {
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return
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}
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if apply.snapshot.Metadata.Index <= ep.appliedi {
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plog.Panicf("snapshot index [%d] should > appliedi[%d] + 1",
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apply.snapshot.Metadata.Index, ep.appliedi)
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}
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if s.cfg.V3demo {
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snapfn, err := s.r.storage.DBFilePath(apply.snapshot.Metadata.Index)
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if err != nil {
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plog.Panicf("get database snapshot file path error: %v", err)
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}
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fn := path.Join(s.cfg.SnapDir(), databaseFilename)
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if err := os.Rename(snapfn, fn); err != nil {
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plog.Panicf("rename snapshot file error: %v", err)
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}
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newKV := dstorage.New(fn, &s.consistIndex)
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if err := newKV.Restore(); err != nil {
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plog.Panicf("restore KV error: %v", err)
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}
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oldKV := s.swapKV(newKV)
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// Closing oldKV might block until all the txns
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// on the kv are finished.
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// We do not want to wait on closing the old kv.
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go func() {
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if err := oldKV.Close(); err != nil {
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plog.Panicf("close KV error: %v", err)
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}
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}()
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}
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if err := s.store.Recovery(apply.snapshot.Data); err != nil {
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plog.Panicf("recovery store error: %v", err)
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}
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s.cluster.Recover()
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// recover raft transport
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s.r.transport.RemoveAllPeers()
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for _, m := range s.cluster.Members() {
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if m.ID == s.ID() {
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continue
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}
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s.r.transport.AddPeer(m.ID, m.PeerURLs)
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}
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ep.appliedi = apply.snapshot.Metadata.Index
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ep.snapi = ep.appliedi
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ep.confState = apply.snapshot.Metadata.ConfState
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plog.Infof("recovered from incoming snapshot at index %d", ep.snapi)
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}
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func (s *EtcdServer) applyEntries(ep *etcdProgress, apply *apply) {
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if len(apply.entries) == 0 {
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return
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}
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firsti := apply.entries[0].Index
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if firsti > ep.appliedi+1 {
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plog.Panicf("first index of committed entry[%d] should <= appliedi[%d] + 1", firsti, ep.appliedi)
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}
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var ents []raftpb.Entry
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if ep.appliedi+1-firsti < uint64(len(apply.entries)) {
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ents = apply.entries[ep.appliedi+1-firsti:]
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}
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var shouldstop bool
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if ep.appliedi, shouldstop = s.apply(ents, &ep.confState); shouldstop {
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go s.stopWithDelay(10*100*time.Millisecond, fmt.Errorf("the member has been permanently removed from the cluster"))
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}
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}
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func (s *EtcdServer) triggerSnapshot(ep *etcdProgress) {
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if ep.appliedi-ep.snapi <= s.snapCount {
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return
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}
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plog.Infof("start to snapshot (applied: %d, lastsnap: %d)", ep.appliedi, ep.snapi)
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s.snapshot(ep.appliedi, ep.confState)
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ep.snapi = ep.appliedi
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}
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// Stop stops the server gracefully, and shuts down the running goroutine.
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// Stop should be called after a Start(s), otherwise it will block forever.
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func (s *EtcdServer) Stop() {
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