add start up check for disk quota

ddl/ingest/backend_mgr.go

@@ -53,6 +53,10 @@ func newLitBackendCtxMgr(path string, memQuota uint64) BackendCtxMgr {
 	LitMemRoot = mgr.memRoot
 	LitDiskRoot = mgr.diskRoot
 	LitDiskRoot.UpdateUsage()
+	err := LitDiskRoot.StartupCheck()
+	if err != nil {
+		logutil.BgLogger().Warn("[ddl-ingest] ingest backfill may not be available", zap.Error(err))
+	}
 	return mgr
 }
 

ddl/ingest/disk_root.go

@@ -31,6 +31,7 @@ type DiskRoot interface {
 	ShouldImport() bool
 	UsageInfo() string
 	PreCheckUsage() error
+	StartupCheck() error
 }
 
 const capacityThreshold = 0.9
@@ -103,6 +104,21 @@ func (d *diskRootImpl) PreCheckUsage() error {
 	return nil
 }
 
+// StartupCheck implements DiskRoot interface.
+func (d *diskRootImpl) StartupCheck() error {
+	sz, err := lcom.GetStorageSize(d.path)
+	if err != nil {
+		return errors.Trace(err)
+	}
+	quota := variable.DDLDiskQuota.Load()
+	if sz.Available < quota {
+		sortPath := ConfigSortPath()
+		return errors.Errorf("the available disk space(%d) in %s should be greater than @@tidb_ddl_disk_quota(%d)",
+			sz.Available, sortPath, quota)
+	}
+	return nil
+}
+
 // RiskOfDiskFull checks if the disk has less than 10% space.
 func RiskOfDiskFull(available, capacity uint64) bool {
 	return float64(available) < (1-capacityThreshold)*float64(capacity)