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consistency_queue.go
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/
consistency_queue.go
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// Copyright 2016 The Cockroach Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License.
//
// Author: Vivek Menezes (vivek@cockroachlabs.com)
package storage
import (
"time"
"golang.org/x/net/context"
"github.com/cockroachdb/cockroach/pkg/config"
"github.com/cockroachdb/cockroach/pkg/gossip"
"github.com/cockroachdb/cockroach/pkg/roachpb"
"github.com/cockroachdb/cockroach/pkg/util/hlc"
"github.com/cockroachdb/cockroach/pkg/util/log"
)
type consistencyQueue struct {
*baseQueue
interval time.Duration
replicaCountFn func() int
}
// newConsistencyQueue returns a new instance of consistencyQueue.
func newConsistencyQueue(store *Store, gossip *gossip.Gossip) *consistencyQueue {
q := &consistencyQueue{
interval: store.cfg.ConsistencyCheckInterval,
replicaCountFn: store.ReplicaCount,
}
q.baseQueue = newBaseQueue(
"replica consistency checker", q, store, gossip,
queueConfig{
maxSize: defaultQueueMaxSize,
needsLease: true,
needsSystemConfig: false,
acceptsUnsplitRanges: true,
successes: store.metrics.ConsistencyQueueSuccesses,
failures: store.metrics.ConsistencyQueueFailures,
pending: store.metrics.ConsistencyQueuePending,
processingNanos: store.metrics.ConsistencyQueueProcessingNanos,
},
)
return q
}
func (q *consistencyQueue) shouldQueue(
ctx context.Context, now hlc.Timestamp, repl *Replica, _ config.SystemConfig,
) (bool, float64) {
shouldQ, priority := true, float64(0)
if !repl.store.cfg.TestingKnobs.DisableLastProcessedCheck {
lpTS, err := repl.getQueueLastProcessed(ctx, q.name)
if err != nil {
log.ErrEventf(ctx, "consistency queue last processed timestamp: %s", err)
}
if shouldQ, priority = shouldQueueAgain(now, lpTS, q.interval); !shouldQ {
return false, 0
}
}
// Check if all replicas are live. Some tests run without a NodeLiveness configured.
if repl.store.cfg.NodeLiveness != nil {
for _, rep := range repl.Desc().Replicas {
if live, err := repl.store.cfg.NodeLiveness.IsLive(rep.NodeID); err != nil {
log.ErrEventf(ctx, "node %d liveness failed: %s", rep.NodeID, err)
return false, 0
} else if !live {
return false, 0
}
}
}
return true, priority
}
// process() is called on every range for which this node is a lease holder.
func (q *consistencyQueue) process(
ctx context.Context, repl *Replica, _ config.SystemConfig,
) error {
req := roachpb.CheckConsistencyRequest{}
if _, pErr := repl.CheckConsistency(ctx, req); pErr != nil {
log.Error(ctx, pErr.GoError())
}
// Update the last processed time for this queue.
if err := repl.setQueueLastProcessed(ctx, q.name, repl.store.Clock().Now()); err != nil {
log.ErrEventf(ctx, "failed to update last processed time: %v", err)
}
return nil
}
func (q *consistencyQueue) timer(duration time.Duration) time.Duration {
// An interval between replicas to space consistency checks out over
// the check interval.
replicaCount := q.replicaCountFn()
if replicaCount == 0 {
return 0
}
replInterval := q.interval / time.Duration(replicaCount)
if replInterval < duration {
return 0
}
return replInterval - duration
}
// purgatoryChan returns nil.
func (*consistencyQueue) purgatoryChan() <-chan struct{} {
return nil
}