mirror of
https://github.com/etcd-io/etcd.git
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91 lines
2.5 KiB
Go
91 lines
2.5 KiB
Go
package etcdserver
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import (
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"log"
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pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
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"github.com/coreos/etcd/migrate"
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"github.com/coreos/etcd/pkg/pbutil"
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"github.com/coreos/etcd/pkg/types"
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"github.com/coreos/etcd/raft/raftpb"
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"github.com/coreos/etcd/snap"
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"github.com/coreos/etcd/wal"
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"github.com/coreos/etcd/wal/walpb"
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)
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type Storage interface {
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// Save function saves ents and state to the underlying stable storage.
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// Save MUST block until st and ents are on stable storage.
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Save(st raftpb.HardState, ents []raftpb.Entry) error
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// SaveSnap function saves snapshot to the underlying stable storage.
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SaveSnap(snap raftpb.Snapshot) error
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// TODO: WAL should be able to control cut itself. After implement self-controlled cut,
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// remove it in this interface.
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// Cut cuts out a new wal file for saving new state and entries.
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Cut() error
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// Close closes the Storage and performs finalization.
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Close() error
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}
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type storage struct {
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*wal.WAL
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*snap.Snapshotter
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}
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func NewStorage(w *wal.WAL, s *snap.Snapshotter) Storage {
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return &storage{w, s}
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}
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// SaveSnap saves the snapshot to disk and release the locked
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// wal files since they will not be used.
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func (st *storage) SaveSnap(snap raftpb.Snapshot) error {
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err := st.Snapshotter.SaveSnap(snap)
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if err != nil {
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return err
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}
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walsnap := walpb.Snapshot{
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Index: snap.Metadata.Index,
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Term: snap.Metadata.Term,
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}
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err = st.WAL.SaveSnapshot(walsnap)
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if err != nil {
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return err
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}
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err = st.WAL.ReleaseLockTo(snap.Metadata.Index)
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if err != nil {
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return err
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}
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return nil
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}
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func readWAL(waldir string, snap walpb.Snapshot) (w *wal.WAL, id, cid types.ID, st raftpb.HardState, ents []raftpb.Entry) {
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var err error
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if w, err = wal.Open(waldir, snap); err != nil {
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log.Fatalf("etcdserver: open wal error: %v", err)
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}
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var wmetadata []byte
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if wmetadata, st, ents, err = w.ReadAll(); err != nil {
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log.Fatalf("etcdserver: read wal error: %v", err)
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}
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var metadata pb.Metadata
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pbutil.MustUnmarshal(&metadata, wmetadata)
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id = types.ID(metadata.NodeID)
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cid = types.ID(metadata.ClusterID)
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return
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}
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// upgradeWAL converts an older version of the etcdServer data to the newest version.
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// It must ensure that, after upgrading, the most recent version is present.
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func upgradeWAL(cfg *ServerConfig, ver wal.WalVersion) error {
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if ver == wal.WALv0_4 {
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log.Print("etcdserver: converting v0.4 log to v2.0")
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err := migrate.Migrate4To2(cfg.DataDir, cfg.Name)
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if err != nil {
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log.Fatalf("etcdserver: failed migrating data-dir: %v", err)
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return err
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}
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}
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return nil
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}
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