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101 lines
2.9 KiB
101 lines
2.9 KiB
// Copyright 2015 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package etcdserver
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import (
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"io"
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"go.etcd.io/etcd/etcdserver/api/snap"
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"go.etcd.io/etcd/mvcc/backend"
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"go.etcd.io/etcd/raft/raftpb"
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humanize "github.com/dustin/go-humanize"
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"go.uber.org/zap"
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)
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// createMergedSnapshotMessage creates a snapshot message that contains: raft status (term, conf),
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// a snapshot of v2 store inside raft.Snapshot as []byte, a snapshot of v3 KV in the top level message
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// as ReadCloser.
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func (s *EtcdServer) createMergedSnapshotMessage(m raftpb.Message, snapt, snapi uint64, confState raftpb.ConfState) snap.Message {
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// get a snapshot of v2 store as []byte
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clone := s.v2store.Clone()
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d, err := clone.SaveNoCopy()
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if err != nil {
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if lg := s.getLogger(); lg != nil {
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lg.Panic("failed to save v2 store data", zap.Error(err))
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} else {
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plog.Panicf("store save should never fail: %v", err)
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}
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}
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// commit kv to write metadata(for example: consistent index).
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s.KV().Commit()
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dbsnap := s.be.Snapshot()
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// get a snapshot of v3 KV as readCloser
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rc := newSnapshotReaderCloser(s.getLogger(), dbsnap)
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// put the []byte snapshot of store into raft snapshot and return the merged snapshot with
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// KV readCloser snapshot.
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snapshot := raftpb.Snapshot{
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Metadata: raftpb.SnapshotMetadata{
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Index: snapi,
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Term: snapt,
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ConfState: confState,
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},
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Data: d,
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}
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m.Snapshot = snapshot
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return *snap.NewMessage(m, rc, dbsnap.Size())
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}
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func newSnapshotReaderCloser(lg *zap.Logger, snapshot backend.Snapshot) io.ReadCloser {
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pr, pw := io.Pipe()
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go func() {
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n, err := snapshot.WriteTo(pw)
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if err == nil {
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if lg != nil {
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lg.Info(
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"sent database snapshot to writer",
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zap.Int64("bytes", n),
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zap.String("size", humanize.Bytes(uint64(n))),
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)
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} else {
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plog.Infof("wrote database snapshot out [total bytes: %d]", n)
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}
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} else {
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if lg != nil {
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lg.Warn(
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"failed to send database snapshot to writer",
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zap.String("size", humanize.Bytes(uint64(n))),
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zap.Error(err),
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)
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} else {
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plog.Warningf("failed to write database snapshot out [written bytes: %d]: %v", n, err)
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}
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}
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pw.CloseWithError(err)
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err = snapshot.Close()
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if err != nil {
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if lg != nil {
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lg.Panic("failed to close database snapshot", zap.Error(err))
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} else {
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plog.Panicf("failed to close database snapshot: %v", err)
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}
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}
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}()
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return pr
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}
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