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

     1  // Copyright 2016 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_test
    12  
    13  import (
    14  	"context"
    15  	"testing"
    16  
    17  	"github.com/cockroachdb/cockroach/pkg/kv"
    18  	"github.com/cockroachdb/cockroach/pkg/kv/kvserver"
    19  	"github.com/cockroachdb/cockroach/pkg/roachpb"
    20  	"github.com/cockroachdb/cockroach/pkg/testutils"
    21  	"github.com/cockroachdb/cockroach/pkg/util/leaktest"
    22  	"github.com/cockroachdb/cockroach/pkg/util/stop"
    23  	"github.com/cockroachdb/errors"
    24  )
    25  
    26  func TestEagerReplication(t *testing.T) {
    27  	defer leaktest.AfterTest(t)()
    28  
    29  	ctx := context.Background()
    30  	storeCfg := kvserver.TestStoreConfig(nil /* clock */)
    31  	// Disable the replica scanner so that we rely on the eager replication code
    32  	// path that occurs after splits.
    33  	storeCfg.TestingKnobs.DisableScanner = true
    34  
    35  	stopper := stop.NewStopper()
    36  	defer stopper.Stop(ctx)
    37  	store := createTestStoreWithConfig(t, stopper, storeCfg)
    38  
    39  	// After bootstrap, all of the system ranges should be present in replicate
    40  	// queue purgatory (because we only have a single store in the test and thus
    41  	// replication cannot succeed).
    42  	purgatoryStartCount := store.ReplicateQueuePurgatoryLength()
    43  
    44  	t.Logf("purgatory start count is %d", purgatoryStartCount)
    45  	// Perform a split and check that there's one more range in the purgatory.
    46  
    47  	key := roachpb.Key("a")
    48  	args := adminSplitArgs(key)
    49  	_, pErr := kv.SendWrapped(ctx, store.TestSender(), args)
    50  	if pErr != nil {
    51  		t.Fatal(pErr)
    52  	}
    53  
    54  	// The addition of replicas to the replicateQueue after a split
    55  	// occurs happens after the update of the descriptors in meta2
    56  	// leaving a tiny window of time in which the newly split replica
    57  	// will not have been added to purgatory. Thus we loop.
    58  	testutils.SucceedsSoon(t, func() error {
    59  		expected := purgatoryStartCount + 1
    60  		if n := store.ReplicateQueuePurgatoryLength(); expected != n {
    61  			return errors.Errorf("expected %d replicas in purgatory, but found %d", expected, n)
    62  		}
    63  		return nil
    64  	})
    65  }