Lightning: Skip apply ioworkers when seek(0, io.SeekCurrent) (#57454)

close #57413
pingcap · Nov 19, 2024 · 0e3efb6 · 0e3efb6
1 parent cfa52d0
commit 0e3efb6
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/pkg/lightning/mydump/reader.go b/pkg/lightning/mydump/reader.go
@@ -189,7 +189,8 @@ func (pr PooledReader) Read(p []byte) (n int, err error) {
 
 // Seek implements io.Seeker
 func (pr PooledReader) Seek(offset int64, whence int) (int64, error) {
-	if pr.ioWorkers != nil {
+	// Seek(0, io.SeekCurrent) is used to get the current offset, which will not cause any Disk I/O.
+	if pr.ioWorkers != nil && !(offset == 0 && whence == io.SeekCurrent) {
 		w := pr.ioWorkers.Apply()
 		defer pr.ioWorkers.Recycle(w)
 	}