github.com/cockroachdb/cockroach@v20.2.0-alpha.1+incompatible/pkg/kv/kvserver/client_status_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/roachpb"
    19  	"github.com/cockroachdb/cockroach/pkg/testutils"
    20  	"github.com/cockroachdb/cockroach/pkg/util/leaktest"
    21  	"github.com/cockroachdb/errors"
    22  )
    23  
    24  func TestComputeStatsForKeySpan(t *testing.T) {
    25  	defer leaktest.AfterTest(t)()
    26  	mtc := &multiTestContext{}
    27  	defer mtc.Stop()
    28  	mtc.Start(t, 3)
    29  
    30  	// Create a number of ranges using splits.
    31  	splitKeys := []string{"a", "c", "e", "g", "i"}
    32  	for _, k := range splitKeys {
    33  		key := roachpb.Key(k)
    34  		repl := mtc.stores[0].LookupReplica(roachpb.RKey(key))
    35  		args := adminSplitArgs(key)
    36  		header := roachpb.Header{
    37  			RangeID: repl.RangeID,
    38  		}
    39  		if _, err := kv.SendWrappedWith(context.Background(), mtc.stores[0], header, args); err != nil {
    40  			t.Fatal(err)
    41  		}
    42  	}
    43  
    44  	// Wait for splits to finish.
    45  	testutils.SucceedsSoon(t, func() error {
    46  		repl := mtc.stores[0].LookupReplica(roachpb.RKey("z"))
    47  		if actualRSpan := repl.Desc().RSpan(); !actualRSpan.Key.Equal(roachpb.RKey("i")) {
    48  			return errors.Errorf("expected range %s to begin at key 'i'", repl)
    49  		}
    50  		return nil
    51  	})
    52  
    53  	// Create some keys across the ranges.
    54  	incKeys := []string{"b", "bb", "bbb", "d", "dd", "h"}
    55  	for _, k := range incKeys {
    56  		if _, err := mtc.dbs[0].Inc(context.Background(), []byte(k), 5); err != nil {
    57  			t.Fatal(err)
    58  		}
    59  	}
    60  
    61  	// Verify stats across different spans.
    62  	for _, tcase := range []struct {
    63  		startKey       string
    64  		endKey         string
    65  		expectedRanges int
    66  		expectedKeys   int64
    67  	}{
    68  		{"a", "i", 4, 6},
    69  		{"a", "c", 1, 3},
    70  		{"b", "e", 2, 5},
    71  		{"e", "i", 2, 1},
    72  	} {
    73  		start, end := tcase.startKey, tcase.endKey
    74  		result, err := mtc.stores[0].ComputeStatsForKeySpan(
    75  			roachpb.RKey(start), roachpb.RKey(end))
    76  		if err != nil {
    77  			t.Fatal(err)
    78  		}
    79  		if a, e := result.ReplicaCount, tcase.expectedRanges; a != e {
    80  			t.Errorf("Expected %d ranges in span [%s - %s], found %d", e, start, end, a)
    81  		}
    82  		if a, e := result.MVCC.LiveCount, tcase.expectedKeys; a != e {
    83  			t.Errorf("Expected %d keys in span [%s - %s], found %d", e, start, end, a)
    84  		}
    85  	}
    86  }