diff --git a/dbms/src/Common/TiFlashMetrics.h b/dbms/src/Common/TiFlashMetrics.h
index d36f55935de..fcf5d582097 100644
--- a/dbms/src/Common/TiFlashMetrics.h
+++ b/dbms/src/Common/TiFlashMetrics.h
@@ -756,7 +756,8 @@ namespace DB
     M(tiflash_read_thread_internal_us,                                                                                              \
       "Durations of read thread internal components",                                                                               \
       Histogram,                                                                                                                    \
-      F(type_block_queue_pop_latency, {{"type", "block_queue_pop_latency"}}, ExpBuckets{1, 2, 20}))
+      F(type_block_queue_pop_latency, {{"type", "block_queue_pop_latency"}}, ExpBuckets{1, 2, 20}),                                 \
+      F(type_schedule_one_round, {{"type", "schedule_one_round"}}, ExpBuckets{1, 2, 20}))
 
 
 /// Buckets with boundaries [start * base^0, start * base^1, ..., start * base^(size-1)]
diff --git a/dbms/src/Storages/DeltaMerge/ReadThread/SegmentReadTaskScheduler.cpp b/dbms/src/Storages/DeltaMerge/ReadThread/SegmentReadTaskScheduler.cpp
index 58aedc77572..4ff80158a0e 100644
--- a/dbms/src/Storages/DeltaMerge/ReadThread/SegmentReadTaskScheduler.cpp
+++ b/dbms/src/Storages/DeltaMerge/ReadThread/SegmentReadTaskScheduler.cpp
@@ -244,6 +244,7 @@ bool SegmentReadTaskScheduler::isStop() const
 
 std::tuple<UInt64, UInt64, UInt64> SegmentReadTaskScheduler::scheduleOneRound()
 {
+    Stopwatch sw;
     UInt64 erased_pool_count = 0;
     UInt64 sched_null_count = 0;
     UInt64 sched_succ_count = 0;
@@ -276,6 +277,7 @@ std::tuple<UInt64, UInt64, UInt64> SegmentReadTaskScheduler::scheduleOneRound()
         ++sched_succ_count;
         SegmentReaderPoolManager::instance().addTask(std::move(merged_task));
     }
+    GET_METRIC(tiflash_read_thread_internal_us, type_schedule_one_round).Observe(sw.elapsed() / 1000.0);
     return std::make_tuple(erased_pool_count, sched_null_count, sched_succ_count);
 }
 
diff --git a/dbms/src/Storages/DeltaMerge/SegmentReadTaskPool.cpp b/dbms/src/Storages/DeltaMerge/SegmentReadTaskPool.cpp
index 492c9f65f69..9e8407d3dfa 100644
--- a/dbms/src/Storages/DeltaMerge/SegmentReadTaskPool.cpp
+++ b/dbms/src/Storages/DeltaMerge/SegmentReadTaskPool.cpp
@@ -263,6 +263,7 @@ void SegmentReadTaskPool::finishSegment(const SegmentPtr & seg)
     if (pool_finished)
     {
         q.finish();
+        LOG_INFO(log, "pool_id={} finished", pool_id);
     }
 }
 
diff --git a/dbms/src/Storages/DeltaMerge/SegmentReadTaskPool.h b/dbms/src/Storages/DeltaMerge/SegmentReadTaskPool.h
index 55695abb5bd..2f17c91febb 100644
--- a/dbms/src/Storages/DeltaMerge/SegmentReadTaskPool.h
+++ b/dbms/src/Storages/DeltaMerge/SegmentReadTaskPool.h
@@ -159,12 +159,12 @@ class SegmentReadTaskPool : private boost::noncopyable
         auto total_count = blk_stat.totalCount();
         auto total_bytes = blk_stat.totalBytes();
         auto blk_avg_bytes = total_count > 0 ? total_bytes / total_count : 0;
-        auto approximate_max_pending_block_bytes = blk_avg_bytes * max_queue_size;
+        auto approx_max_pending_block_bytes = blk_avg_bytes * max_queue_size;
         auto total_rows = blk_stat.totalRows();
         LOG_INFO(
             log,
             "Done. pool_id={} table_id={} pop={} pop_empty={} pop_empty_ratio={} "
-            "max_queue_size={} blk_avg_bytes={} approximate_max_pending_block_bytes={:.2f}MB "
+            "max_queue_size={} blk_avg_bytes={} approx_max_pending_block_bytes={:.2f}MB "
             "total_count={} total_bytes={:.2f}MB total_rows={} avg_block_rows={} avg_rows_bytes={}B",
             pool_id,
             physical_table_id,
@@ -173,7 +173,7 @@ class SegmentReadTaskPool : private boost::noncopyable
             pop_empty_ratio,
             max_queue_size,
             blk_avg_bytes,
-            approximate_max_pending_block_bytes / 1024.0 / 1024.0,
+            approx_max_pending_block_bytes / 1024.0 / 1024.0,
             total_count,
             total_bytes / 1024.0 / 1024.0,
             total_rows,