diff --git a/src/mito2/src/read/scan_util.rs b/src/mito2/src/read/scan_util.rs
index 8e19dff5cf..385f6fa4b5 100644
--- a/src/mito2/src/read/scan_util.rs
+++ b/src/mito2/src/read/scan_util.rs
@@ -23,6 +23,7 @@ use futures::Stream;
 use prometheus::IntGauge;
 use snafu::ResultExt;
 use store_api::storage::RegionId;
+use tokio::task::yield_now;
 
 use crate::error::{Result, TimeoutSnafu};
 use crate::metrics::SCAN_PARTITION;
@@ -218,6 +219,10 @@ pub(crate) fn scan_file_ranges(
         //     .build_file_ranges(index, read_type, &mut reader_metrics)
         //     .await?;
         part_metrics.inc_num_file_ranges(ranges.len());
+
+        // Notify other partitions.
+        yield_now().await;
+
         if read_type == "unordered_scan_files" {
             common_telemetry::debug!(
                 "[DEBUG_SCAN] Thread: {:?}, Scan file ranges build ranges end, region_id: {}, partition: {}, index: {:?}, ranges: {}",