limit the size of a non-resident queue

h2/src/main/org/h2/mvstore/cache/CacheLongKeyLIRS.java

@@ -931,8 +931,13 @@ public class CacheLongKeyLIRS<V> {
 
         void trimNonResidentQueue() {
             Entry<V> e;
-            int maxQueue2Size = nonResidentQueueSize * (mapSize - queue2Size);
-            if (maxQueue2Size >= 0) {
+            int maxQueue2Size = 4 * nonResidentQueueSize * (mapSize - queue2Size);
+            while (queue2Size > maxQueue2Size) {
+                e = queue2.queuePrev;
+                int hash = getHash(e.key);
+                remove(e.key, hash);
+            }
+            maxQueue2Size >>= 2;
             while (queue2Size > maxQueue2Size) {
                 e = queue2.queuePrev;
                 WeakReference<V> reference = e.reference;
@@ -943,7 +948,6 @@ public class CacheLongKeyLIRS<V> {
                 remove(e.key, hash);
             }
         }
-        }
 
         private void convertOldestHotToCold() {
             // the last entry of the stack is known to be hot