revert test change from 124aaa3

The original attempt to fix this test introduced timing issues which
made this test flakey. This commit reverts all the changes to
TestStoreRangeSplitAndMergeWithGlobalReads.

Epic: none
Fixes: #119230

Release note: None

pkg/kv/kvserver/client_split_test.go

@@ -4042,17 +4042,10 @@ func TestStoreRangeSplitAndMergeWithGlobalReads(t *testing.T) {
 		}
 		return nil
 	}
-	// Set global reads.
-	zoneConfig := zonepb.DefaultZoneConfig()
-	zoneConfig.GlobalReads = proto.Bool(true)
 
 	ctx := context.Background()
 	s, sqlDB, _ := serverutils.StartServer(t, base.TestServerArgs{
 		Knobs: base.TestingKnobs{
-			Server: &server.TestingKnobs{
-				DefaultZoneConfigOverride: &zoneConfig,
-			},
-
 			Store: &kvserver.StoreTestingKnobs{
 				DisableMergeQueue:     true,
 				TestingResponseFilter: respFilter,
@@ -4082,6 +4075,11 @@ func TestStoreRangeSplitAndMergeWithGlobalReads(t *testing.T) {
 	// response filter.
 	clockPtr.Store(s.Clock())
 
+	// Set global reads.
+	zoneConfig := zonepb.DefaultZoneConfig()
+	zoneConfig.GlobalReads = proto.Bool(true)
+	config.TestingSetZoneConfig(config.ObjectID(descID), zoneConfig)
+
 	// Perform a write to the system config span being watched by
 	// the SystemConfigProvider.
 	tdb.Exec(t, "CREATE TABLE foo ()")
@@ -4093,19 +4091,6 @@ func TestStoreRangeSplitAndMergeWithGlobalReads(t *testing.T) {
 		return nil
 	})
 
-	// The commit wait count is 1 due to the split above since global reads are
-	// set for the default config.
-	var splitCount = int64(1)
-	testutils.SucceedsSoon(t, func() error {
-		if splitCount != store.Metrics().CommitWaitsBeforeCommitTrigger.Count() {
-			return errors.Errorf("commit wait count is %d", store.Metrics().CommitWaitsBeforeCommitTrigger.Count())
-		}
-		if splitCount != atomic.LoadInt64(&splits) {
-			return errors.Errorf("num splits is %d", atomic.LoadInt64(&splits))
-		}
-		return nil
-	})
-
 	// Write to the range, which has the effect of bumping the closed timestamp.
 	pArgs := putArgs(descKey, []byte("foo"))
 	_, pErr = kv.SendWrapped(ctx, store.TestSender(), pArgs)
@@ -4116,9 +4101,8 @@ func TestStoreRangeSplitAndMergeWithGlobalReads(t *testing.T) {
 	splitArgs = adminSplitArgs(splitKey)
 	_, pErr = kv.SendWrapped(ctx, store.TestSender(), splitArgs)
 	require.Nil(t, pErr)
-	splitCount++
-	require.Equal(t, splitCount, store.Metrics().CommitWaitsBeforeCommitTrigger.Count())
-	require.Equal(t, splitCount, atomic.LoadInt64(&splits))
+	require.Equal(t, int64(1), store.Metrics().CommitWaitsBeforeCommitTrigger.Count())
+	require.Equal(t, int64(1), atomic.LoadInt64(&splits))
 
 	repl := store.LookupReplica(roachpb.RKey(splitKey))
 	require.Equal(t, splitKey, repl.Desc().StartKey.AsRawKey())
@@ -4127,7 +4111,7 @@ func TestStoreRangeSplitAndMergeWithGlobalReads(t *testing.T) {
 	mergeArgs := adminMergeArgs(descKey)
 	_, pErr = kv.SendWrapped(ctx, store.TestSender(), mergeArgs)
 	require.Nil(t, pErr)
-	require.Equal(t, splitCount+1, store.Metrics().CommitWaitsBeforeCommitTrigger.Count())
+	require.Equal(t, int64(2), store.Metrics().CommitWaitsBeforeCommitTrigger.Count())
 	require.Equal(t, int64(1), atomic.LoadInt64(&merges))
 
 	repl = store.LookupReplica(roachpb.RKey(splitKey))