swaroopak commented on a change in pull request #1110: HBASE-23761: The new 
cache entry can overflow the maxSize in CachedEn…
URL: https://github.com/apache/hbase/pull/1110#discussion_r376082001
 
 

 ##########
 File path: 
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/LruCachedBlockQueue.java
 ##########
 @@ -65,14 +65,15 @@ public LruCachedBlockQueue(long maxSize, long blockSize) {
    * @param cb block to try to add to the queue
    */
   public void add(LruCachedBlock cb) {
-    if(heapSize < maxSize) {
+    long cbSize = cb.heapSize();
+    if(heapSize + cbSize < maxSize) {
       queue.add(cb);
-      heapSize += cb.heapSize();
+      heapSize += cbSize;
     } else {
       LruCachedBlock head = queue.peek();
       if(cb.compareTo(head) > 0) {
         heapSize += cb.heapSize();
-        heapSize -= head.heapSize();
+        heapSize -= cbSize;
 
 Review comment:
   Oh yes, my bad!

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