diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/LruBlockCache.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/LruBlockCache.java
index 5ff3edb946d..99463178ab3 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/LruBlockCache.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/LruBlockCache.java
@@ -302,7 +302,6 @@ public class LruBlockCache implements BlockCache, HeapSize {
       String msg = "Cached an already cached block: " + cacheKey + " cb:" + cb.getCacheKey();
       msg += ". This is harmless and can happen in rare cases (see HBASE-8547)";
       LOG.warn(msg);
-      assert false : msg;
       return;
     }
     cb = new CachedBlock(cacheKey, buf, count.incrementAndGet(), inMemory);
diff --git a/hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/TestLruBlockCache.java b/hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/TestLruBlockCache.java
index dbe03c40c41..8b17f5a1447 100644
--- a/hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/TestLruBlockCache.java
+++ b/hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/TestLruBlockCache.java
@@ -118,17 +118,6 @@ public class TestLruBlockCache {
       assertEquals(buf.heapSize(), block.heapSize());
     }
 
-    // Re-add same blocks and ensure nothing has changed
-    for (CachedItem block : blocks) {
-      try {
-        cache.cacheBlock(block.cacheKey, block);
-        assertTrue("Cache should not allow re-caching a block", false);
-      } catch(AssertionError re) {
-        // expected
-        assertTrue(re.getMessage().contains("Cached an already cached block"));
-      }
-    }
-
     // Verify correctly calculated cache heap size
     assertEquals(expectedCacheSize, cache.heapSize());