func tryRaftLogEntry(kv engine.MVCCKeyValue) (string, error) {
var ent raftpb.Entry
if err := maybeUnmarshalInline(kv.Value, &ent); err != nil {
return "", err
}
if ent.Type == raftpb.EntryNormal {
if len(ent.Data) > 0 {
_, cmdData := storage.DecodeRaftCommand(ent.Data)
var cmd storagebase.RaftCommand
if err := cmd.Unmarshal(cmdData); err != nil {
return "", err
}
ent.Data = nil
return fmt.Sprintf("%s by %v\n%s\n%s\n", &ent, cmd.OriginReplica, cmd.BatchRequest, &cmd), nil
}
return fmt.Sprintf("%s: EMPTY\n", &ent), nil
} else if ent.Type == raftpb.EntryConfChange {
var cc raftpb.ConfChange
if err := cc.Unmarshal(ent.Data); err != nil {
return "", err
}
var ctx storage.ConfChangeContext
if err := ctx.Unmarshal(cc.Context); err != nil {
return "", err
}
var cmd storagebase.ReplicatedEvalResult
if err := cmd.Unmarshal(ctx.Payload); err != nil {
return "", err
}
ent.Data = nil
return fmt.Sprintf("%s\n%s\n", &ent, &cmd), nil
}
return "", fmt.Errorf("unknown log entry type: %s", &ent)
}
func (r *Replica) handleReplicatedEvalResult(
ctx context.Context, rResult storagebase.ReplicatedEvalResult,
) (shouldAssert bool) {
// Fields for which no action is taken in this method are zeroed so that
// they don't trigger an assertion at the end of the method (which checks
// that all fields were handled).
{
rResult.IsLeaseRequest = false
rResult.IsConsistencyRelated = false
rResult.IsFreeze = false
rResult.Timestamp = hlc.ZeroTimestamp
}
if rResult.BlockReads {
r.readOnlyCmdMu.Lock()
defer r.readOnlyCmdMu.Unlock()
rResult.BlockReads = false
}
// Update MVCC stats and Raft portion of ReplicaState.
r.mu.Lock()
r.mu.state.Stats.Add(rResult.Delta)
if rResult.State.RaftAppliedIndex != 0 {
r.mu.state.RaftAppliedIndex = rResult.State.RaftAppliedIndex
}
if rResult.State.LeaseAppliedIndex != 0 {
r.mu.state.LeaseAppliedIndex = rResult.State.LeaseAppliedIndex
}
needsSplitBySize := r.needsSplitBySizeLocked()
r.mu.Unlock()
r.store.metrics.addMVCCStats(rResult.Delta)
rResult.Delta = enginepb.MVCCStats{}
const raftLogCheckFrequency = 1 + RaftLogQueueStaleThreshold/4
if rResult.State.RaftAppliedIndex%raftLogCheckFrequency == 1 {
r.store.raftLogQueue.MaybeAdd(r, r.store.Clock().Now())
}
if needsSplitBySize {
r.store.splitQueue.MaybeAdd(r, r.store.Clock().Now())
}
rResult.State.Stats = enginepb.MVCCStats{}
rResult.State.LeaseAppliedIndex = 0
rResult.State.RaftAppliedIndex = 0
// The above are always present, so we assert only if there are
// "nontrivial" actions below.
shouldAssert = (rResult != storagebase.ReplicatedEvalResult{})
// Process Split or Merge. This needs to happen after stats update because
// of the ContainsEstimates hack.
if rResult.Split != nil {
// TODO(tschottdorf): We want to let the usual MVCCStats-delta
// machinery update our stats for the left-hand side. But there is no
// way to pass up an MVCCStats object that will clear out the
// ContainsEstimates flag. We should introduce one, but the migration
// makes this worth a separate effort (ContainsEstimates would need to
// have three possible values, 'UNCHANGED', 'NO', and 'YES').
// Until then, we're left with this rather crude hack.
{
r.mu.Lock()
r.mu.state.Stats.ContainsEstimates = false
stats := r.mu.state.Stats
r.mu.Unlock()
if err := setMVCCStats(ctx, r.store.Engine(), r.RangeID, stats); err != nil {
log.Fatal(ctx, errors.Wrap(err, "unable to write MVCC stats"))
}
}
splitPostApply(
r.AnnotateCtx(ctx),
rResult.Split.RHSDelta,
&rResult.Split.SplitTrigger,
r,
)
rResult.Split = nil
}
if rResult.Merge != nil {
if err := r.store.MergeRange(ctx, r, rResult.Merge.LeftDesc.EndKey,
rResult.Merge.RightDesc.RangeID,
); err != nil {
// Our in-memory state has diverged from the on-disk state.
log.Fatalf(ctx, "failed to update store after merging range: %s", err)
}
rResult.Merge = nil
}
// Update the remaining ReplicaState.
if rResult.State.Frozen != storagebase.ReplicaState_FROZEN_UNSPECIFIED {
r.mu.Lock()
r.mu.state.Frozen = rResult.State.Frozen
r.mu.Unlock()
}
rResult.State.Frozen = storagebase.ReplicaState_FROZEN_UNSPECIFIED
if newDesc := rResult.State.Desc; newDesc != nil {
if err := r.setDesc(newDesc); err != nil {
// Log the error. There's not much we can do because the commit may
// have already occurred at this point.
log.Fatalf(
ctx,
"failed to update range descriptor to %+v: %s",
newDesc, err,
)
}
rResult.State.Desc = nil
}
if change := rResult.ChangeReplicas; change != nil {
if change.ChangeType == roachpb.REMOVE_REPLICA &&
r.store.StoreID() == change.Replica.StoreID {
// This wants to run as late as possible, maximizing the chances
// that the other nodes have finished this command as well (since
// processing the removal from the queue looks up the Range at the
// lease holder, being too early here turns this into a no-op).
if _, err := r.store.replicaGCQueue.Add(r, replicaGCPriorityRemoved); err != nil {
// Log the error; the range should still be GC'd eventually.
log.Errorf(ctx, "unable to add to replica GC queue: %s", err)
}
}
rResult.ChangeReplicas = nil
}
if newLease := rResult.State.Lease; newLease != nil {
rResult.State.Lease = nil // for assertion
r.mu.Lock()
replicaID := r.mu.replicaID
prevLease := r.mu.state.Lease
r.mu.state.Lease = newLease
r.mu.Unlock()
r.leasePostApply(ctx, newLease, replicaID, prevLease)
}
if newTruncState := rResult.State.TruncatedState; newTruncState != nil {
rResult.State.TruncatedState = nil // for assertion
r.mu.Lock()
r.mu.state.TruncatedState = newTruncState
r.mu.Unlock()
// Clear any entries in the Raft log entry cache for this range up
// to and including the most recently truncated index.
r.store.raftEntryCache.clearTo(r.RangeID, newTruncState.Index+1)
}
if newThresh := rResult.State.GCThreshold; newThresh != hlc.ZeroTimestamp {
r.mu.Lock()
r.mu.state.GCThreshold = newThresh
r.mu.Unlock()
rResult.State.GCThreshold = hlc.ZeroTimestamp
}
if newThresh := rResult.State.TxnSpanGCThreshold; newThresh != hlc.ZeroTimestamp {
r.mu.Lock()
r.mu.state.TxnSpanGCThreshold = newThresh
r.mu.Unlock()
rResult.State.TxnSpanGCThreshold = hlc.ZeroTimestamp
}
if rResult.ComputeChecksum != nil {
r.computeChecksumPostApply(ctx, *rResult.ComputeChecksum)
rResult.ComputeChecksum = nil
}
if rResult.RaftLogDelta != nil {
r.mu.Lock()
r.mu.raftLogSize += *rResult.RaftLogDelta
if r.mu.raftLogSize < 0 {
// Ensure raftLogSize is not negative since it isn't persisted between
// server restarts.
r.mu.raftLogSize = 0
}
r.mu.Unlock()
rResult.RaftLogDelta = nil
}
if (rResult != storagebase.ReplicatedEvalResult{}) {
log.Fatalf(ctx, "unhandled field in ReplicatedEvalResult: %s", pretty.Diff(rResult, storagebase.ReplicatedEvalResult{}))
}
return shouldAssert
}