diff --git a/be/src/common/daemon.cpp b/be/src/common/daemon.cpp
index fc49853bb5a92e..da85028bb50e47 100644
--- a/be/src/common/daemon.cpp
+++ b/be/src/common/daemon.cpp
@@ -129,16 +129,13 @@ void Daemon::tcmalloc_gc_thread() {
                 to_free_bytes = std::max(to_free_bytes, tc_cached_bytes * 30 / 100);
                 to_free_bytes = std::min(to_free_bytes, tc_cached_bytes);
                 expected_aggressive_decommit = 1;
-            } else {
-                // release rate is enough.
-                to_free_bytes = 0;
             }
             last_ms = kMaxLastMs;
         } else if (memory_pressure > (pressure_limit - 10)) {
+            // In most cases, adjusting release rate is enough, if memory are consumed quickly
+            // we should release manually.
             if (last_memory_pressure <= (pressure_limit - 10)) {
                 to_free_bytes = std::max(to_free_bytes, tc_cached_bytes * 10 / 100);
-            } else {
-                to_free_bytes = 0;
             }
         }
 
@@ -172,6 +169,7 @@ void Daemon::tcmalloc_gc_thread() {
                 last_ms = 0;
              }
         } else {
+            DCHECK(tc_cached_bytes <= tc_used_bytes * max_cache_percent / 100);
             last_ms = 0;
         }
     }