diff --git a/be/src/vec/exec/scan/scanner_scheduler.cpp b/be/src/vec/exec/scan/scanner_scheduler.cpp
index 81d72984a719217..251599ebf3017ab 100644
--- a/be/src/vec/exec/scan/scanner_scheduler.cpp
+++ b/be/src/vec/exec/scan/scanner_scheduler.cpp
@@ -141,6 +141,8 @@ Status ScannerScheduler::submit(std::shared_ptr<ScannerContext> ctx) {
     if (ctx->done()) {
         return Status::EndOfFile("ScannerContext is done");
     }
+    Status st = Status::InternalError("yyyy begin to schedule");
+    LOG(INFO) << st;
     ctx->queue_idx = (_queue_idx++ % QUEUE_NUM);
     if (!_pending_queues[ctx->queue_idx]->blocking_put(ctx)) {
         return Status::InternalError("failed to submit scanner context to scheduler");