Revert "Disabled tests for CI testing"

This reverts commit 17c28f3.

ddl/column.go

@@ -823,7 +823,6 @@ func doReorgWorkForModifyColumn(w *worker, d *ddlCtx, t *meta.Meta, job *model.J
 	// enable: curl -X PUT -d "pause" "http://127.0.0.1:10080/fail/github.com/pingcap/tidb/ddl/mockDelayInModifyColumnTypeWithData".
 	// disable: curl -X DELETE "http://127.0.0.1:10080/fail/github.com/pingcap/tidb/ddl/mockDelayInModifyColumnTypeWithData"
 	failpoint.Inject("mockDelayInModifyColumnTypeWithData", func() {})
-	// TODO: add session begin/commit handling including cleaning up tidb_ddl_reorg
 	err = w.runReorgJob(rh, reorgInfo, tbl.Meta(), d.lease, func() (addIndexErr error) {
 		defer util.Recover(metrics.LabelDDL, "onModifyColumn",
 			func() {

ddl/partition.go

@@ -1764,7 +1764,6 @@ func (w *worker) onDropTablePartition(d *ddlCtx, t *meta.Meta, job *model.Job) (
 				// and then run the reorg next time.
 				return ver, errors.Trace(err)
 			}
-			// TODO: Use an own session!
 			err = w.runReorgJob(rh, reorgInfo, tbl.Meta(), d.lease, func() (dropIndexErr error) {
 				defer tidbutil.Recover(metrics.LabelDDL, "onDropTablePartition",
 					func() {

ddl/reorg.go

@@ -253,9 +253,10 @@ func (w *worker) runReorgJob(rh *reorgHandler, reorgInfo *reorgInfo, tblInfo *mo
 		}
 
 		updateBackfillProgress(w, reorgInfo, tblInfo, 0)
-		// TODO: Move the remove reorg handle into the worker
-		// Also never start a transaction for the session (rh?)
-		if err1 := rh.RemoveDDLReorgHandle(job, reorgInfo.elements); err1 != nil {
+
+		// Do this is a separate transaction, since mysql.tidb_ddl_reorg may have been updated
+		// by the inner function and could result in commit conflicts.
+		if err1 := reorgInfo.deleteReorgMeta(w.sessPool); err1 != nil {
 			logutil.BgLogger().Warn("[ddl] run reorg job done, removeDDLReorgHandle failed", zap.Error(err1))
 			return errors.Trace(err1)
 		}
@@ -644,7 +645,6 @@ func getReorgInfo(ctx *JobContext, d *ddlCtx, rh *reorgHandler, job *model.Job,
 		failpoint.Inject("errorUpdateReorgHandle", func() (*reorgInfo, error) {
 			return &info, errors.New("occur an error when update reorg handle")
 		})
-		// TODO: Wrap these two into a single transaction?
 		err = rh.RemoveDDLReorgHandle(job, elements)
 		if err != nil {
 			return &info, errors.Trace(err)
@@ -755,6 +755,35 @@ func getReorgInfoFromPartitions(ctx *JobContext, d *ddlCtx, rh *reorgHandler, jo
 	return &info, nil
 }
 
+func (r *reorgInfo) deleteReorgMeta(pool *sessionPool) error {
+	if len(r.elements) == 0 {
+		return nil
+	}
+	se, err := pool.get()
+	if err != nil {
+		return errors.Trace(err)
+	}
+	defer pool.put(se)
+
+	sess := newSession(se)
+	err = sess.begin()
+	if err != nil {
+		return errors.Trace(err)
+	}
+	txn, err := sess.txn()
+	if err != nil {
+		sess.rollback()
+		return errors.Trace(err)
+	}
+	rh := newReorgHandler(meta.NewMeta(txn), sess, variable.EnableConcurrentDDL.Load())
+	err = rh.RemoveDDLReorgHandle(r.Job, r.elements)
+	err1 := sess.commit()
+	if err == nil {
+		err = err1
+	}
+	return errors.Trace(err)
+}
+
 func (r *reorgInfo) UpdateReorgMeta(startKey kv.Key, pool *sessionPool) (err error) {
 	if startKey == nil && r.EndKey == nil {
 		return nil

executor/oomtest/oom_test.go

@@ -44,7 +44,6 @@ func TestMain(m *testing.M) {
 }
 
 func TestMemTracker4UpdateExec(t *testing.T) {
-	t.Skip("TODO: remove CI hacking")
 	store := testkit.CreateMockStore(t)
 
 	tk := testkit.NewTestKit(t, store)
@@ -64,7 +63,6 @@ func TestMemTracker4UpdateExec(t *testing.T) {
 }
 
 func TestMemTracker4InsertAndReplaceExec(t *testing.T) {
-	t.Skip("TODO: remove CI hacking")
 	store := testkit.CreateMockStore(t)
 
 	tk := testkit.NewTestKit(t, store)
@@ -135,7 +133,6 @@ func TestMemTracker4InsertAndReplaceExec(t *testing.T) {
 }
 
 func TestMemTracker4DeleteExec(t *testing.T) {
-	t.Skip("TODO: remove CI hacking")
 	store := testkit.CreateMockStore(t)
 
 	tk := testkit.NewTestKit(t, store)