github.com/cockroachdb/cockroach@v20.2.0-alpha.1+incompatible/pkg/kv/kvserver/replica_closedts.go (about)

     1  // Copyright 2019 The Cockroach Authors.
     2  //
     3  // Use of this software is governed by the Business Source License
     4  // included in the file licenses/BSL.txt.
     5  //
     6  // As of the Change Date specified in that file, in accordance with
     7  // the Business Source License, use of this software will be governed
     8  // by the Apache License, Version 2.0, included in the file
     9  // licenses/APL.txt.
    10  
    11  package kvserver
    12  
    13  import (
    14  	"context"
    15  
    16  	"github.com/cockroachdb/cockroach/pkg/kv/kvserver/closedts/ctpb"
    17  )
    18  
    19  // EmitMLAI registers the replica's last assigned max lease index with the
    20  // closed timestamp tracker. This is called to emit an update about this
    21  // replica in the absence of write activity.
    22  func (r *Replica) EmitMLAI() {
    23  	r.mu.RLock()
    24  	lai := r.mu.proposalBuf.LastAssignedLeaseIndexRLocked()
    25  	if r.mu.state.LeaseAppliedIndex > lai {
    26  		lai = r.mu.state.LeaseAppliedIndex
    27  	}
    28  	epoch := r.mu.state.Lease.Epoch
    29  	isLeaseholder := r.mu.state.Lease.Replica.ReplicaID == r.mu.replicaID
    30  	r.mu.RUnlock()
    31  
    32  	// If we're the leaseholder of an epoch-based lease, notify the minPropTracker
    33  	// of the current LAI to trigger a re-broadcast of this range's LAI.
    34  	if isLeaseholder && epoch > 0 {
    35  		ctx := r.AnnotateCtx(context.Background())
    36  		_, untrack := r.store.cfg.ClosedTimestamp.Tracker.Track(ctx)
    37  		untrack(ctx, ctpb.Epoch(epoch), r.RangeID, ctpb.LAI(lai))
    38  	}
    39  }