diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/BlockCacheUtil.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/BlockCacheUtil.java
index 267299276e4..c2cf82148be 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/BlockCacheUtil.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/BlockCacheUtil.java
@@ -244,7 +244,7 @@ public class BlockCacheUtil {
             + "nextBlockOnDiskSize set, Keeping cached block.");
         return false;
       } else {
-        LOG.warn("Caching an already cached block: {}. This is harmless and can happen in rare "
+        LOG.debug("Caching an already cached block: {}. This is harmless and can happen in rare "
             + "cases (see HBASE-8547)",
           cacheKey);
         return false;